Closed Bug 1424709 Opened 6 years ago Closed 6 years ago

[macos] crash when changing macos network location

Categories

(Core :: Memory Allocator, defect, P1)

58 Branch
x86
macOS
defect

Tracking

()

VERIFIED FIXED
mozilla60
Tracking Status
firefox-esr52 --- fixed
firefox58 --- wontfix
firefox59 --- verified
firefox60 --- verified

People

(Reporter: 5423938, Assigned: glandium)

References

Details

(Keywords: crash)

Attachments

(2 files)

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171130160223

Steps to reproduce:

0 - on macOS, have more than one "network location" each with different configuration (eg. web proxyes or different networks)
1 - Have Firefox open, browsing any websites
2 - On the apple menu, go to Location, then change location
(see https://apple.stackexchange.com/questions/298961/unable-to-change-network-location-while-firefox-is-open - Unable to change network location while Firefox is open)


Actual results:

- a message pops up with te text "firefox quit unexpectedly"
- the network location is not changed
- firefox does not actually crash
- I have to close firefox, change the network location, then re-open firefox


Expected results:

the network should be changed. In my case, it changes the router address so I can switch network connection on the fly
I have been facing this issue for quite some time. To help diagnose further, If I reset my profile it stops happening.

After resetting, I installed all my extensions, then also it did not happen. But, after few days of usage, it started happening again.

I am ready to help diagnose this issue. Please let me know if I need to share any logs etc.
Severity: normal → critical
Component: Untriaged → Widget: Cocoa
Keywords: crash
OS: Unspecified → Mac OS X
Product: Firefox → Core
Hardware: Unspecified → x86
Tracy, this seems to be a duplicate of bug 1362238. I see the crash rate of bug 1362238 has decreased quite significantly over the last two months. Is there maybe a correlation with particular OS versions that could explain this?
Flags: needinfo?(twalker)
Gus and deepak, please provide the crash report ID link in about:crashes so we can get the signature correctly associated with this bug.  

Stephen, definitely looks similar. Let's see what the signature is and go from there.
Flags: needinfo?(5423938)
One additional information - I get this error only when Firefox is in the foreground. It does not happen if any other application has the focus.
Dump as shown in the 'Send to Apple' message box:

Process:               firefox [833]
Path:                  /Applications/Firefox.app/Contents/MacOS/firefox
Identifier:            firefox
Version:               57.0.1 (5717.11.28)
Code Type:             X86-64 (Native)
Parent Process:        firefox [405]
Responsible:           firefox [405]
User ID:               901

Date/Time:             2017-12-14 09:25:09.191 +0530
OS Version:            Mac OS X 10.10.5 (14F2511)
Report Version:        11
Anonymous UUID:        68EE2F46-5B4B-433B-9F94-6E23B98DABEB


Time Awake Since Boot: 800 seconds

Crashed Thread:        0  Dispatch queue: com.apple.root.default-qos

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)
Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000020

VM Regions Near 0x20:
--> 
    __TEXT                 000000010fa09000-000000010fa0b000 [    8K] r-x/rwx SM=COW  /Applications/Firefox.app/Contents/MacOS/firefox

Application Specific Information:
crashed on child side of fork pre-exec

Thread 0 Crashed:: Dispatch queue: com.apple.root.default-qos
0   libsystem_malloc.dylib        	0x00007fff8f729f8a nano_forked_calloc + 11
1   libsystem_malloc.dylib        	0x00007fff8f71bb90 malloc_zone_calloc + 78
2   libsystem_malloc.dylib        	0x00007fff8f71c546 calloc + 49
3   libobjc.A.dylib               	0x00007fff8cd67c12 class_createInstance + 133
4   libdispatch.dylib             	0x00007fff8bb68ce1 _os_object_alloc_realized + 38
5   libxpc.dylib                  	0x00007fff8515dea9 _xpc_pipe_create + 61
6   libxpc.dylib                  	0x00007fff8517347d xpc_atfork_child + 117
7   libSystem.B.dylib             	0x00007fff8c7dfb9f libSystem_atfork_child + 54
8   libsystem_c.dylib             	0x00007fff8acbfee0 fork + 29
9   com.apple.HIServices          	0x00007fff883720f7 HIS_XPC_SetNetworkLocation + 271
10  com.apple.HIToolbox           	0x00007fff88ad4d99 ___ZL14SwitchLocationP13OpaqueMenuReft_block_invoke + 18
11  libdispatch.dylib             	0x00007fff8bb6c700 _dispatch_call_block_and_release + 12
12  libdispatch.dylib             	0x00007fff8bb68e73 _dispatch_client_callout + 8
13  libdispatch.dylib             	0x00007fff8bb6bdc7 _dispatch_root_queue_drain + 935
14  libdispatch.dylib             	0x00007fff8bb6ba1c _dispatch_worker_thread3 + 91
15  libsystem_pthread.dylib       	0x00007fff8ab90a9d _pthread_wqthread + 729
16  libsystem_pthread.dylib       	0x00007fff8ab8e3dd start_wqthread + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000000  rcx: 0x0000000000000000  rdx: 0x0000000000000048
  rdi: 0x0000000000000000  rsi: 0x0000000000000001  rbp: 0x00000001218eebb0  rsp: 0x00000001218eebb0
   r8: 0x0000000000000303   r9: 0x0000000000000000  r10: 0x000000010fad0000  r11: 0x0000000000000206
  r12: 0x0000000000000048  r13: 0x0000000000000000  r14: 0x000000010fa3d478  r15: 0x0000000000000001
  rip: 0x00007fff8f729f8a  rfl: 0x0000000000010213  cr2: 0x0000000000000020
  
Logical CPU:     2
Error Code:      0x00000004
Trap Number:     14


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    0x7fff9045a000 -     0x7fff90482fff  libRIP.A.dylib (790) <55EB0B9D-15AE-35E9-9C9E-99637A4E3B13> /System/Library/Frameworks/CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib
    0x7fff90483000 -     0x7fff904affff  libc++abi.dylib (125.1) <B8E6BB31-E27E-3B80-9BA2-73B5AB7E42E1> /usr/lib/libc++abi.dylib
    0x7fff904b0000 -     0x7fff90501fff  com.apple.audio.CoreAudio (4.3.0 - 4.3.0) <8E6AE326-9F3E-3182-BD9E-FDF561211E2E> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
    0x7fff90502000 -     0x7fff90533ff7  com.apple.ProtectedCloudStorage (1.0 - 1) <9D76F2E0-C28A-3DBC-A91F-E87888D46BF0> /System/Library/PrivateFrameworks/ProtectedCloudStorage.framework/Versions/A/ProtectedCloudStorage
    0x7fff90534000 -     0x7fff90554ff7  com.apple.MultitouchSupport.framework (264.6 - 264.6) <79E327E8-AA72-346D-8B5E-8BAC56FC17A5> /System/Library/PrivateFrameworks/MultitouchSupport.framework/Versions/A/MultitouchSupport
    0x7fff90588000 -     0x7fff905e2ff7  com.apple.LanguageModeling (1.0 - 1) <ACA93FE0-A0E3-333E-AE3C-8EB7DE5F362F> /System/Library/PrivateFrameworks/LanguageModeling.framework/Versions/A/LanguageModeling
    0x7fff905e3000 -     0x7fff905e3fff  com.apple.audio.units.AudioUnit (1.12 - 1.12) <E5335492-7EFE-31EA-BE72-4A9CEE68D58E> /System/Library/Frameworks/AudioUnit.framework/Versions/A/AudioUnit
    0x7fff905f1000 -     0x7fff9060cff7  com.apple.aps.framework (4.0 - 4.0) <EAC8C347-55F4-3769-995E-B140C95553F6> /System/Library/PrivateFrameworks/ApplePushService.framework/Versions/A/ApplePushService
    0x7fff9060d000 -     0x7fff90615ff7  com.apple.AppleSRP (5.0 - 1) <68F0C577-ED96-34F2-B701-CE3023367D4D> /System/Library/PrivateFrameworks/AppleSRP.framework/Versions/A/AppleSRP
    0x7fff90616000 -     0x7fff906b8fff  com.apple.Bluetooth (4.3.6 - 4.3.6f4) <D9286207-FC6A-36B7-A10D-830F6B1A2E8F> /System/Library/Frameworks/IOBluetooth.framework/Versions/A/IOBluetooth
    0x7fff906fa000 -     0x7fff90731ffb  com.apple.LDAPFramework (2.4.28 - 194.5) <CAFB9695-000F-34EA-8DF5-09996929C26A> /System/Library/Frameworks/LDAP.framework/Versions/A/LDAP
    0x7fff90732000 -     0x7fff90732fff  com.apple.Carbon (154 - 157) <9BF51672-1684-3FDE-A561-FC59A2864EF8> /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
    0x7fff90733000 -     0x7fff90751ff7  com.apple.addressbook.vCard (9.0 - 1579) <C4CDDC8B-AE35-39B8-820A-763E9C5D1794> /System/Library/PrivateFrameworks/vCard.framework/Versions/A/vCard
    0x7fff90752000 -     0x7fff9075cfff  com.apple.IntlPreferences (2.0 - 150.1) <29687F33-EE4C-3530-8AB9-5B36DBAF4485> /System/Library/PrivateFrameworks/IntlPreferences.framework/Versions/A/IntlPreferences
    0x7fff907c7000 -     0x7fff907e4fff  libsystem_kernel.dylib (2782.70.3) <79B806D6-AEEF-3663-BAE3-2D8A4A0A7A92> /usr/lib/system/libsystem_kernel.dylib
    0x7fff9089f000 -     0x7fff908d0fff  libtidy.A.dylib (15.15) <37FC944D-271A-386A-9ADD-FA33AD48F96D> /usr/lib/libtidy.A.dylib
    0x7fff908d1000 -     0x7fff908d5ff7  libGIF.dylib (1248) <6102CFE3-029E-32DE-B954-93797A4EF5B0> /System/Library/Frameworks/ImageIO.framework/Versions/A/Resources/libGIF.dylib
    0x7fff90916000 -     0x7fff90d23ff7  libLAPACK.dylib (1128) <F9201AE7-B031-36DB-BCF8-971E994EF7C1> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
    0x7fff91ce8000 -     0x7fff91ce8fff  com.apple.Accelerate (1.10 - Accelerate 1.10) <2C8AF258-4F11-3BEC-A826-22D7199B3975> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
    0x7fff91ce9000 -     0x7fff91cfbff7  com.apple.CoreDuetDaemonProtocol (1.0 - 1) <CE9FABB4-1C5D-3F9B-9BB8-5CC50C3E5E31> /System/Library/PrivateFrameworks/CoreDuetDaemonProtocol.framework/Versions/A/CoreDuetDaemonProtocol
    0x7fff91cfc000 -     0x7fff91d07ff7  com.apple.DirectoryService.Framework (10.10 - 187) <F5B30ACE-57D9-31EA-82F9-98F175B277D1> /System/Library/Frameworks/DirectoryService.framework/Versions/A/DirectoryService
    0x7fff91d08000 -     0x7fff91d8cfff  com.apple.PerformanceAnalysis (1.0 - 1) <8CC3D6CB-2328-32A5-B70E-174AD408E892> /System/Library/PrivateFrameworks/PerformanceAnalysis.framework/Versions/A/PerformanceAnalysis
    0x7fff91db3000 -     0x7fff92029fff  com.apple.security (7.0 - 57031.40.9) <8D9CB878-BB71-3CF1-88CE-9E6FAC4043ED> /System/Library/Frameworks/Security.framework/Versions/A/Security
    0x7fff9202a000 -     0x7fff92035fff  libcommonCrypto.dylib (60061.30.1) <E789748D-F9A7-3CFF-B317-90DF348B1E95> /usr/lib/system/libcommonCrypto.dylib
    0x7fff92036000 -     0x7fff92050ff7  com.apple.Kerberos (3.0 - 1) <7760E0C2-A222-3709-B2A6-B692D900CEB1> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
    0x7fff92051000 -     0x7fff92051fff  com.apple.quartzframework (1.5 - 1.5) <26C982A3-2FC3-3F50-B5F4-3C545C3BAC10> /System/Library/Frameworks/Quartz.framework/Versions/A/Quartz
    0x7fff92052000 -     0x7fff920f9fff  com.apple.PDFKit (3.1 - 3.1) <D410CE57-6227-31D8-9F39-92583E552EA8> /System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/PDFKit.framework/Versions/A/PDFKit

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 648
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=329.7M resident=192.5M(58%) swapped_out_or_unallocated=137.2M(42%)
Writable regions: Total=550.6M written=9.8M(2%) resident=303.7M(55%) swapped_out=0K(0%) unallocated=247.0M(45%)
 
REGION TYPE                      VIRTUAL
===========                      =======
CG image                           1156K
CoreAnimation                         8K
CoreGraphics                          4K
CoreImage                            16K
CoreUI image data                    68K
Foundation                            4K
Kernel Alloc Once                     8K
MALLOC                            158.4M
MALLOC (admin)                       32K
Mach message                        472K
Memory Tag 242                       12K
Memory Tag 251                        8K
OpenCL                               32K
OpenGL GLSL                         256K
STACK GUARD                           4K
Stack                             121.3M
VM_ALLOCATE                         1.3G
__DATA                             35.7M
__GLSLBUILTINS                     2588K
__IMAGE                             528K
__LINKEDIT                         74.2M
__TEXT                            255.5M
__UNICODE                           552K
mapped file                       366.4M
shared memory                      4712K
shared memory (reserved)             92K        reserved VM address space (unallocated)
===========                      =======
TOTAL                               2.3G
TOTAL, minus reserved VM space      2.3G
 

Model: MacBookPro11,2, BootROM MBP112.0138.B18, 4 processors, Intel Core i7, 2.2 GHz, 16 GB, SMC 2.18f15
Graphics: Intel Iris Pro, Intel Iris Pro, Built-In
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533641465238412D50422020
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1600 MHz, 0x80AD, 0x484D54343147533641465238412D50422020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x134), Broadcom BCM43xx 1.0 (7.15.166.24.3)
Bluetooth: Version 4.3.6f4 17916, 3 services, 18 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en0
Serial ATA Device: APPLE SSD SM0256F, 251 GB
USB Device: Internal Memory Card Reader
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
USB Device: Apple Internal Keyboard / Trackpad
Thunderbolt Bus: MacBook Pro, Apple Inc., 17.1
Can you get the report ID by typing about:crashes in the URL bar of Firefox?
Flags: needinfo?(deepak)
The Firefox's crash reporter does not catch the error. Firefox continues to run despite the dialogue indicating that it has crashed. Network location does not change.
about:crashes - does not include these crashes.
Flags: needinfo?(deepak)
I also have no information in the about:crashes page.

Here's one of my Apple crash details, happened just now while trying to switch location:

I have

Process:               firefox [13275]
Path:                  /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/firefox
Identifier:            firefox
Version:               58.0 (5817.12.11)
Code Type:             X86-64 (Native)
Parent Process:        firefox [907]
Responsible:           firefox [13275]
User ID:               501

Date/Time:             2017-12-18 12:29:29.755 +0100
OS Version:            Mac OS X 10.12.6 (16G29)
Report Version:        12
Anonymous UUID:        3DEE8A9E-0E29-2A4B-8CF8-D6E9147467ED


Time Awake Since Boot: 12000 seconds

System Integrity Protection: enabled

Crashed Thread:        0  Dispatch queue: com.apple.root.default-qos

Exception Type:        EXC_BAD_ACCESS (SIGBUS)
Exception Codes:       KERN_PROTECTION_FAILURE at 0x00000001041cb470
Exception Note:        EXC_CORPSE_NOTIFY

Termination Signal:    Bus error: 10
Termination Reason:    Namespace SIGNAL, Code 0xa
Terminating Process:   exc handler [0]

VM Regions Near 0x1041cb470:
    __DATA                 00000001041ba000-00000001041bb000 [    4K] rw-/rwx SM=COW  /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib
--> __LINKEDIT             00000001041bb000-00000001041d1000 [   88K] r--/rwx SM=COW  /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib
    MALLOC guard page      00000001041d1000-00000001041d2000 [    4K] ---/rwx SM=NUL  

Thread 0 Crashed:: Dispatch queue: com.apple.root.default-qos
0   libsystem_malloc.dylib        	0x00007fffd696fd72 nano_reinit_lock + 11
1   libsystem_malloc.dylib        	0x00007fffd696e48a _malloc_fork_child + 289
2   libSystem.B.dylib             	0x00007fffd5232b08 libSystem_atfork_child + 24
3   libsystem_c.dylib             	0x00007fffd6821437 fork + 47
4   com.apple.HIServices          	0x00007fffbfd62ba0 HIS_XPC_SetNetworkLocation + 277
5   com.apple.HIToolbox           	0x00007fffc07261b0 ___ZL14SwitchLocationP13OpaqueMenuReft_block_invoke + 18
6   libdispatch.dylib             	0x00007fffd67ae524 _dispatch_call_block_and_release + 12
7   libdispatch.dylib             	0x00007fffd67a58fc _dispatch_client_callout + 8
8   libdispatch.dylib             	0x00007fffd67b4196 _dispatch_queue_override_invoke + 743
9   libdispatch.dylib             	0x00007fffd67a76b5 _dispatch_root_queue_drain + 476
10  libdispatch.dylib             	0x00007fffd67a748c _dispatch_worker_thread3 + 99
11  libsystem_pthread.dylib       	0x00007fffd69f45a2 _pthread_wqthread + 1299
12  libsystem_pthread.dylib       	0x00007fffd69f407d start_wqthread + 13

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x0000000000000001  rcx: 0x0000000104211000  rdx: 0xffffffffffffffff
  rdi: 0x00000001041ba470  rsi: 0x0000000000000088  rbp: 0x000070000d1bcc50  rsp: 0x000070000d1bcc38
   r8: 0x000000000000001c   r9: 0x00000000000000a0  r10: 0x00007fffd69098be  r11: 0x0000000000000207
  r12: 0x0000000000000000  r13: 0x0000000000000014  r14: 0x0000000000000000  r15: 0x61b13015ba3a0094
  rip: 0x00007fffd696fd72  rfl: 0x0000000000010246  cr2: 0x00000001041cb470
  
Logical CPU:     0
Error Code:      0x00000007
Trap Number:     14


Binary Images:
       0x104185000 -        0x104186fff +org.mozilla.firefoxdeveloperedition (58.0 - 5817.12.11) <BB9734EF-38DC-33AD-9644-A084723595A1> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/firefox
       0x104190000 -        0x1041b9ff7 +libmozglue.dylib (1) <09D3C5DB-6FFB-3107-A2A7-AD11F8279203> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib
       0x104244000 -        0x10424ffff +liblgpllibs.dylib (1) <43707897-C01A-312C-A86E-94A9021DCD73> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/liblgpllibs.dylib
       0x104500000 -        0x104739ff7 +libnss3.dylib (1) <D870AC47-7474-3910-8C73-644BB6F22FB2> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libnss3.dylib
       0x104802000 -        0x109627fd7 +XUL (1) <D9E4630C-29AA-39C4-8451-8460282EB3D8> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/XUL
       0x10f099000 -        0x10f0d6dc7  dyld (433.5) <322C06B7-8878-311D-888C-C8FD2CA96FF3> /usr/lib/dyld
       0x114e3f000 -        0x114e40fe3 +cl_kernels (???) <3F1B445D-D632-49D7-9774-D66240DFB6DA> cl_kernels
       0x12056f000 -        0x120599fff  GLRendererFloat (14.0.16) <6B57F70A-EFAC-3DB2-B9BA-E55D05D44DB5> /System/Library/Frameworks/OpenGL.framework/Resources/GLRendererFloat.bundle/GLRendererFloat
       0x121200000 -        0x1213a6fff  GLEngine (14.0.16) <08F2E804-13D2-3E80-9322-1A23A84A55F3> /System/Library/Frameworks/OpenGL.framework/Resources/GLEngine.bundle/GLEngine
       0x1213e5000 -        0x121934ff7  com.apple.driver.AppleIntelBDWGraphicsGLDriver (10.25.17 - 10.2.5) <8633C1AB-7008-3B8B-8D6D-8E1DE49DD265> /System/Library/Extensions/AppleIntelBDWGraphicsGLDriver.bundle/Contents/MacOS/AppleIntelBDWGraphicsGLDriver
       0x121b4f000 -        0x121bceff7  com.apple.driver.AppleIntelBDWGraphicsMTLDriver (10.25.17 - 10.2.5) <20DB0471-534D-3570-9E5A-AB052CF54E68> /System/Library/Extensions/AppleIntelBDWGraphicsMTLDriver.bundle/Contents/MacOS/AppleIntelBDWGraphicsMTLDriver
       0x122500000 -        0x122523fff +libmozavutil.dylib (1) <A8EB6CE1-AF81-38C2-A985-D27EC97C716D> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozavutil.dylib
       0x128237000 -        0x128273ff7 +libsoftokn3.dylib (1) <88FEFF28-82C8-3BE9-80A2-D71F0A9D6E6E> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libsoftokn3.dylib
       0x128400000 -        0x12846eff7 +libfreebl3.dylib (1) <EB4137A5-3FA1-3EF4-9E1E-BBB5D4A26FE5> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libfreebl3.dylib
       0x12848d000 -        0x1284ddfff +libnssckbi.dylib (1) <8E60F160-8D4C-3CEC-9450-686438F830A1> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libnssckbi.dylib
       0x8ee742000 -        0x8ee913fe7 +libmozavcodec.dylib (1) <3D436F83-96E8-3CA4-903C-BE2CF5E9A626> /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozavcodec.dylib
       0x91323e000 -        0x913324fff  unorm8_bgra.dylib (2.8.5) <74CB9618-8EDC-336E-A994-C5A1612BD32E> /System/Library/Frameworks/OpenCL.framework/Versions/A/Libraries/ImageFormats/unorm8_bgra.dylib
       0x914f4a000 -        0x915030fe3  unorm8_rgx.dylib (2.8.5) <04B398A5-2A3C-3041-B8C8-9F91CB154B25> /System/Library/Frameworks/OpenCL.framework/Versions/A/Libraries/ImageFormats/unorm8_rgx.dylib
    0x7fffbbc7c000 -     0x7fffbbfc1ff7  com.apple.RawCamera.bundle (7.04 - 914) <86A67D11-9791-3CE6-9FF5-3387C0AB925B> /System/Library/CoreServices/RawCamera.bundle/Contents/MacOS/RawCamera
    0x7fffbd7f8000 -     0x7fffbd9b9fff  com.apple.avfoundation (2.0 - 1187.36) <2F390EAD-07BB-3788-9E73-13104C2E04CD> /System/Library/Frameworks/AVFoundation.framework/Versions/A/AVFoundation
    0x7fffbd9ba000 -     0x7fffbda5cff7  com.apple.audio.AVFAudio (1.0 - ???) <7997D588-B542-3EBB-B822-D719C1114BB4> /System/Library/Frameworks/AVFoundation.framework/Versions/A/Frameworks/AVFAudio.framework/Versions/A/AVFAudio
    0x7fffbdb27000 -     0x7fffbdb27fff  com.apple.Accelerate (1.11 - Accelerate 1.11) <916E360F-323C-3AE1-AB3D-D1F3B284AEE9> /System/Library/Frameworks/Accelerate.framework/Versions/A/Accelerate
    0x7fffbdb28000 -     0x7fffbdb3fffb  libCGInterfaces.dylib (331.5) <17109679-A284-3C72-AA60-DBA815D3062B> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/Libraries/libCGInterfaces.dylib
    0x7fffbdb40000 -     0x7fffbe059feb  com.apple.vImage (8.1 - ???) <B58A7937-BEE2-38FE-87F4-5D5F40D31DC9> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vImage.framework/Versions/A/vImage
    0x7fffbe05a000 -     0x7fffbe1cbff3  libBLAS.dylib (1185.50.4) <4087FFE0-627E-3623-96B4-F0A9A1991E09> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
    0x7fffbe1cc000 -     0x7fffbe1e0ffb  libBNNS.dylib (15) <254698C7-7D36-3FFF-864E-ADEEEE543076> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBNNS.dylib
    0x7fffbe1e1000 -     0x7fffbe5d7fef  libLAPACK.dylib (1185.50.4) <C35FFB2F-A0E6-3903-8A3C-113A74BCBCA2> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLAPACK.dylib
    0x7fffbe5d8000 -     0x7fffbe5eefff  libLinearAlgebra.dylib (1185.50.4) <345CAACF-7263-36EF-B69B-793EA8B390AF> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
    0x7fffbe5ef000 -     0x7fffbe5f5fff  libQuadrature.dylib (3) <EF56C8E6-DE22-3C69-B543-A8648F335FDD> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libQuadrature.dylib
    0x7fffbe5f6000 -     0x7fffbe60aff7  libSparseBLAS.dylib (1185.50.4) <67BA432E-FB59-3C78-A8BE-ED4274CBC359> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libSparseBLAS.dylib
    0x7fffbe60b000 -     0x7fffbe792fe7  libvDSP.dylib (600.60.1) <4155F45B-41CD-3782-AE8F-7AE740FD83C3> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvDSP.dylib
    0x7fffbe793000 -     0x7fffbe845fff  libvMisc.dylib (600.60.1) <E18365D7-DCC4-3304-A8D1-395E656D7B99> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
    0x7fffbe846000 -     0x7fffbe846fff  com.apple.Accelerate.vecLib (3.11 - vecLib 3.11) <7C5733E7-0568-3E7D-AF61-160F19FED544> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/vecLib
    0x7fffbe847000 -     0x7fffbe884ffb  com.apple.Accounts (113 - 113) <8550BD08-7D05-3AC4-A0CC-B67ECB2DE950> /System/Library/Frameworks/Accounts.framework/Versions/A/Accounts
    0x7fffbe885000 -     0x7fffbeb04ff7  com.apple.AddressBook.framework (10.0 - 1756.20) <E512B69B-8DBE-3085-95BE-750B8EFC97FD> /System/Library/Frameworks/AddressBook.framework/Versions/A/AddressBook
    0x7fffbeb05000 -     0x7fffbf8deff3  com.apple.AppKit (6.9 - 1504.83.101) <AE51ACB3-D501-3F91-B369-3D3711F24D0A> /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
    0x7fffbf8f0000 -     0x7fffbf8f0fff  com.apple.ApplicationServices (48 - 48) <DA687F9A-7B2D-342B-8796-16E45344F853> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
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    0x7fffd4ff4000 -     0x7fffd5207fff  libFosl_dynamic.dylib (16.39) <E22A4243-D148-3C74-BA15-2D906A3D1F9E> /usr/lib/libFosl_dynamic.dylib
    0x7fffd5223000 -     0x7fffd522afff  libMatch.1.dylib (27) <70D4BD2A-9383-37F2-B0D6-9B592D236601> /usr/lib/libMatch.1.dylib
    0x7fffd522b000 -     0x7fffd522bfff  libOpenScriptingUtil.dylib (172) <90743888-C1E8-34E3-924E-1A754B2B63B9> /usr/lib/libOpenScriptingUtil.dylib
    0x7fffd522c000 -     0x7fffd5230ffb  libScreenReader.dylib (477.40.6) <CBE6420C-EF60-3ACD-A0B6-7CBE936BA3B8> /usr/lib/libScreenReader.dylib
    0x7fffd5231000 -     0x7fffd5232ffb  libSystem.B.dylib (1238.60.2) <F18AC1E7-C6F1-34B1-8069-BE571B3231D4> /usr/lib/libSystem.B.dylib
    0x7fffd529e000 -     0x7fffd52c9ff3  libarchive.2.dylib (41.70.1) <A3FA7D6E-3D68-3524-8B48-EB2ECA44B13B> /usr/lib/libarchive.2.dylib
    0x7fffd52ca000 -     0x7fffd5346fc7  libate.dylib (1.12.13) <D0767875-D02E-3377-84D8-5F174C27BEA9> /usr/lib/libate.dylib
    0x7fffd534a000 -     0x7fffd534aff3  libauto.dylib (187) <34388D0B-C539-3C1B-9408-2BC152162E43> /usr/lib/libauto.dylib
    0x7fffd534b000 -     0x7fffd535bff3  libbsm.0.dylib (34) <20084796-B04D-3B35-A003-EA11459557A9> /usr/lib/libbsm.0.dylib
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    0x7fffd536b000 -     0x7fffd53c1ff7  libc++.1.dylib (307.5) <0B43BB5D-E6EB-3464-8DE9-B41AC8ED9D1C> /usr/lib/libc++.1.dylib
    0x7fffd53c2000 -     0x7fffd53ebff7  libc++abi.dylib (307.4) <BC271AD3-831B-362A-9DA7-E8C51F285FE4> /usr/lib/libc++abi.dylib
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    0x7fffd5414000 -     0x7fffd5414ff7  libcoretls.dylib (121.50.4) <64B1001E-10F6-3542-A3B2-C4B49F51817F> /usr/lib/libcoretls.dylib
    0x7fffd5415000 -     0x7fffd5416ff3  libcoretls_cfhelpers.dylib (121.50.4) <1A10303E-5EB0-3C7C-9165-021FCDFD934D> /usr/lib/libcoretls_cfhelpers.dylib
    0x7fffd54d0000 -     0x7fffd55b5ff7  libcrypto.0.9.8.dylib (64.50.6) <D34E16A7-990A-37A9-933A-DFAA46554EAA> /usr/lib/libcrypto.0.9.8.dylib
    0x7fffd5753000 -     0x7fffd57a6ff7  libcups.2.dylib (450) <9950BFCB-7882-33C9-9ECF-CE66773C5657> /usr/lib/libcups.2.dylib
    0x7fffd57fa000 -     0x7fffd5801ff3  libdscsym.dylib (148.3) <EF99B991-18D9-3A73-BE88-4DC55F036DEF> /usr/lib/libdscsym.dylib
    0x7fffd5823000 -     0x7fffd5823fff  libenergytrace.dylib (15) <A1B040A2-7977-3097-9ADF-34FF181EB970> /usr/lib/libenergytrace.dylib
    0x7fffd5833000 -     0x7fffd5838ff7  libheimdal-asn1.dylib (498.50.8) <A40E3196-235E-34CE-AD9A-8D1AFC5DE004> /usr/lib/libheimdal-asn1.dylib
    0x7fffd5839000 -     0x7fffd592bff7  libiconv.2.dylib (50) <42125B35-81D7-3FC4-9475-A26DBE10884D> /usr/lib/libiconv.2.dylib
    0x7fffd592c000 -     0x7fffd5b51ffb  libicucore.A.dylib (57166.0.1) <CCD2ED24-3071-383B-925D-8D763BB12A6F> /usr/lib/libicucore.A.dylib
    0x7fffd5b57000 -     0x7fffd5b58fff  liblangid.dylib (126) <2085E7A7-9A34-3735-87F4-F174EF8EABF0> /usr/lib/liblangid.dylib
    0x7fffd5b59000 -     0x7fffd5b72ffb  liblzma.5.dylib (10) <44BD0279-99DD-36B5-8A6E-C11432E2098D> /usr/lib/liblzma.5.dylib
    0x7fffd5b73000 -     0x7fffd5b89ff7  libmarisa.dylib (5) <9030D214-5D0F-30CB-AC03-902C63909362> /usr/lib/libmarisa.dylib
    0x7fffd5b8a000 -     0x7fffd5e32ff7  libmecabra.dylib (744.8) <D429FCC9-42A4-38B3-8784-44024BC859EF> /usr/lib/libmecabra.dylib
    0x7fffd5e65000 -     0x7fffd5edfff3  libnetwork.dylib (856.60.1) <191E99F5-4723-3180-8013-02AF2F9AE4B8> /usr/lib/libnetwork.dylib
    0x7fffd5ee0000 -     0x7fffd62b2047  libobjc.A.dylib (709.1) <70614861-0340-32E2-85ED-FE65759CDFFA> /usr/lib/libobjc.A.dylib
    0x7fffd62b5000 -     0x7fffd62b9fff  libpam.2.dylib (21.30.1) <71EB0D88-DE84-3C8D-A2C5-58AA282BC5BC> /usr/lib/libpam.2.dylib
    0x7fffd62ba000 -     0x7fffd62ebfff  libpcap.A.dylib (67.60.1) <F6BC6ED6-AEE4-3520-B248-0C342636E2B0> /usr/lib/libpcap.A.dylib
    0x7fffd6308000 -     0x7fffd6324ffb  libresolv.9.dylib (64) <A244AE4C-00B0-396C-98FF-97FE4DB3DA30> /usr/lib/libresolv.9.dylib
    0x7fffd6325000 -     0x7fffd635efff  libsandbox.1.dylib (592.70.1) <9C428C49-9D9A-3F9F-9573-BF5202D1F933> /usr/lib/libsandbox.1.dylib
    0x7fffd635f000 -     0x7fffd6371ffb  libsasl2.2.dylib (209) <32107C59-22C6-3049-B86E-9C2F85FF549B> /usr/lib/libsasl2.2.dylib
    0x7fffd6372000 -     0x7fffd6373ff3  libspindump.dylib (231.3) <C7CEEB64-06F4-3ACA-AAC1-30ECA909501A> /usr/lib/libspindump.dylib
    0x7fffd6374000 -     0x7fffd64c2ff7  libsqlite3.dylib (254.8) <1ECF7DF7-7A07-3B4B-A63B-F4EFF6BC7ACF> /usr/lib/libsqlite3.dylib
    0x7fffd65b7000 -     0x7fffd65c4fff  libxar.1.dylib (357) <69547C64-E811-326F-BBED-490C6361BDCB> /usr/lib/libxar.1.dylib
    0x7fffd65c5000 -     0x7fffd66b4fff  libxml2.2.dylib (30.17) <D4C3E467-37C6-34DE-8A1B-E7BFC29985E9> /usr/lib/libxml2.2.dylib
    0x7fffd66b5000 -     0x7fffd66defff  libxslt.1.dylib (15.9) <00735AD5-B62D-3E83-86AC-5533E4E2B102> /usr/lib/libxslt.1.dylib
    0x7fffd66df000 -     0x7fffd66f0ff3  libz.1.dylib (67) <46E3FFA2-4328-327A-8D34-A03E20BFFB8E> /usr/lib/libz.1.dylib
    0x7fffd66ff000 -     0x7fffd6703ff7  libcache.dylib (79) <093A4DAB-8385-3D47-A350-E20CB7CCF7BF> /usr/lib/system/libcache.dylib
    0x7fffd6704000 -     0x7fffd670efff  libcommonCrypto.dylib (60092.50.5) <8A64D1B0-C70E-385C-92F0-E669079FDA90> /usr/lib/system/libcommonCrypto.dylib
    0x7fffd670f000 -     0x7fffd6716fff  libcompiler_rt.dylib (62) <55D47421-772A-32AB-B529-1A46C2F43B4D> /usr/lib/system/libcompiler_rt.dylib
    0x7fffd6717000 -     0x7fffd671ffff  libcopyfile.dylib (138) <819BEA3C-DF11-3E3D-A1A1-5A51C5BF1961> /usr/lib/system/libcopyfile.dylib
    0x7fffd6720000 -     0x7fffd67a3fdf  libcorecrypto.dylib (442.50.19) <65D7165E-2E71-335D-A2D6-33F78E2DF0C1> /usr/lib/system/libcorecrypto.dylib
    0x7fffd67a4000 -     0x7fffd67d5fff  libdispatch.dylib (703.50.37) <6582BAD6-ED27-3B30-B620-90B1C5A4AE3C> /usr/lib/system/libdispatch.dylib
    0x7fffd67d6000 -     0x7fffd67dbffb  libdyld.dylib (433.5) <9B2AC56D-107C-3541-A127-9094A751F2C9> /usr/lib/system/libdyld.dylib
    0x7fffd67dc000 -     0x7fffd67dcffb  libkeymgr.dylib (28) <7AA011A9-DC21-3488-BF73-3B5B14D1FDD6> /usr/lib/system/libkeymgr.dylib
    0x7fffd67dd000 -     0x7fffd67e9fff  libkxld.dylib (3789.70.16) <BD02EF3F-6E09-3A64-AB21-553D5B1D2859> /usr/lib/system/libkxld.dylib
    0x7fffd67ea000 -     0x7fffd67eafff  liblaunch.dylib (972.70.1) <B856ABD2-896E-3DE0-B2C8-146A6AF8E2A7> /usr/lib/system/liblaunch.dylib
    0x7fffd67eb000 -     0x7fffd67f0ff3  libmacho.dylib (898) <17D5D855-F6C3-3B04-B680-E9BF02EF8AED> /usr/lib/system/libmacho.dylib
    0x7fffd67f1000 -     0x7fffd67f3ff3  libquarantine.dylib (85.50.1) <12448CC2-378E-35F3-BE33-9DC395A5B970> /usr/lib/system/libquarantine.dylib
    0x7fffd67f4000 -     0x7fffd67f5ffb  libremovefile.dylib (45) <38D4CB9C-10CD-30D3-8B7B-A515EC75FE85> /usr/lib/system/libremovefile.dylib
    0x7fffd67f6000 -     0x7fffd680eff7  libsystem_asl.dylib (349.50.5) <096E4228-3B7C-30A6-8B13-EC909A64499A> /usr/lib/system/libsystem_asl.dylib
    0x7fffd680f000 -     0x7fffd680fff7  libsystem_blocks.dylib (67) <10DC5404-73AB-35B3-A277-A8AFECB476EB> /usr/lib/system/libsystem_blocks.dylib
    0x7fffd6810000 -     0x7fffd689dfef  libsystem_c.dylib (1158.50.2) <E5AE5244-7D0C-36AC-8BB6-C7AE7EA52A4B> /usr/lib/system/libsystem_c.dylib
    0x7fffd689e000 -     0x7fffd68a1ffb  libsystem_configuration.dylib (888.60.2) <BECC01A2-CA8D-31E6-BCDF-D452965FA976> /usr/lib/system/libsystem_configuration.dylib
    0x7fffd68a2000 -     0x7fffd68a5fff  libsystem_coreservices.dylib (41.4) <7D26DE79-B424-3450-85E1-F7FAB32714AB> /usr/lib/system/libsystem_coreservices.dylib
    0x7fffd68a6000 -     0x7fffd68befff  libsystem_coretls.dylib (121.50.4) <EC6FCF07-DCFB-3A03-9CC9-6DD3709974C6> /usr/lib/system/libsystem_coretls.dylib
    0x7fffd68bf000 -     0x7fffd68c5fff  libsystem_dnssd.dylib (765.50.9) <CC960215-0B1B-3822-A13A-3DDE96FA796F> /usr/lib/system/libsystem_dnssd.dylib
    0x7fffd68c6000 -     0x7fffd68efff7  libsystem_info.dylib (503.50.4) <611DB84C-BF70-3F92-8702-B9F28A900920> /usr/lib/system/libsystem_info.dylib
    0x7fffd68f0000 -     0x7fffd6912ff7  libsystem_kernel.dylib (3789.70.16) <34B1F16C-BC9C-3C5F-9045-0CAE91CB5914> /usr/lib/system/libsystem_kernel.dylib
    0x7fffd6913000 -     0x7fffd695afe7  libsystem_m.dylib (3121.6) <86D499B5-BBDC-3D3B-8A4E-97AE8E6672A4> /usr/lib/system/libsystem_m.dylib
    0x7fffd695b000 -     0x7fffd6979ff7  libsystem_malloc.dylib (116.50.8) <A3D15F17-99A6-3367-8C7E-4280E8619C95> /usr/lib/system/libsystem_malloc.dylib
    0x7fffd697a000 -     0x7fffd69d3ffb  libsystem_network.dylib (856.60.1) <369D0221-56CA-3C3E-9EDE-94B41CAE77B7> /usr/lib/system/libsystem_network.dylib
    0x7fffd69d4000 -     0x7fffd69ddff3  libsystem_networkextension.dylib (563.60.2) <B021F2B3-8A75-3633-ABB0-FC012B8E9B0C> /usr/lib/system/libsystem_networkextension.dylib
    0x7fffd69de000 -     0x7fffd69e7ff3  libsystem_notify.dylib (165.20.1) <B8160190-A069-3B3A-BDF6-2AA408221FAE> /usr/lib/system/libsystem_notify.dylib
    0x7fffd69e8000 -     0x7fffd69f0fe7  libsystem_platform.dylib (126.50.8) <897462FD-B318-321B-A554-E61982630F7E> /usr/lib/system/libsystem_platform.dylib
    0x7fffd69f1000 -     0x7fffd69fbff7  libsystem_pthread.dylib (218.60.3) <B8FB5E20-3295-39E2-B5EB-B464D1D4B104> /usr/lib/system/libsystem_pthread.dylib
    0x7fffd69fc000 -     0x7fffd69ffff7  libsystem_sandbox.dylib (592.70.1) <4B92EC49-ACD0-36AE-B07A-A2B8152EAF9D> /usr/lib/system/libsystem_sandbox.dylib
    0x7fffd6a00000 -     0x7fffd6a01ff3  libsystem_secinit.dylib (24.50.4) <F78B847B-3565-3E4B-98A6-F7AD40392E2D> /usr/lib/system/libsystem_secinit.dylib
    0x7fffd6a02000 -     0x7fffd6a09ffb  libsystem_symptoms.dylib (532.50.47) <3390E07C-C1CE-348F-ADBD-2C5440B45EAA> /usr/lib/system/libsystem_symptoms.dylib
    0x7fffd6a0a000 -     0x7fffd6a1dff7  libsystem_trace.dylib (518.70.1) <AC63A7FE-50D9-3A30-96E6-F6B7FF16E465> /usr/lib/system/libsystem_trace.dylib
    0x7fffd6a1e000 -     0x7fffd6a23ffb  libunwind.dylib (35.3) <3D50D8A8-C460-334D-A519-2DA841102C6B> /usr/lib/system/libunwind.dylib
    0x7fffd6a24000 -     0x7fffd6a4dff7  libxpc.dylib (972.70.1) <BF896DF0-D8E9-31A8-A4B3-01120BFEEE52> /usr/lib/system/libxpc.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 178425
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=457.4M resident=0K(0%) swapped_out_or_unallocated=457.4M(100%)
Writable regions: Total=741.5M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=741.5M(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Accelerate framework               512K        5 
CG backing stores                 22.9M       20 
CG image                           420K       22 
CoreUI image data                 1360K       15 
CoreUI image file                  184K        5 
Foundation                          28K        3 
Image IO                            60K       10 
Kernel Alloc Once                    8K        2 
MALLOC                           110.5M       37 
MALLOC guard page                   48K       10 
MALLOC_LARGE (reserved)           1024K        2         reserved VM address space (unallocated)
Mach message                      2584K      104 
Memory Tag 242                      12K        2 
Memory Tag 251                      16K        2 
OpenCL                              16K        2 
OpenGL GLSL                        256K        4 
STACK GUARD                          4K        2 
Stack                             59.4M       69 
Stack Guard                       56.3M       68 
VM_ALLOCATE                       31.5G      142 
VM_ALLOCATE (reserved)             264K        7         reserved VM address space (unallocated)
__DATA                            36.3M      292 
__GLSLBUILTINS                    2588K        2 
__IMAGE                            528K        2 
__LINKEDIT                       178.5M       20 
__TEXT                           278.8M      292 
__UNICODE                          556K        2 
mapped file                        1.1G       69 
shared memory                     16.2M       32 
===========                     =======  ======= 
TOTAL                             33.3G     1215 
TOTAL, minus reserved VM space    33.3G     1215 

Model: iMac16,2, BootROM IM162.0207.B20, 4 processors, Intel Core i5, 2,8 GHz, 16 GB, SMC 2.32f20
Graphics: Intel Iris Pro Graphics 6200, Intel Iris Pro Graphics 6200, Built-In
Memory Module: BANK 0/DIMM0, 8 GB, DDR3, 1867 MHz, 0x80CE, 0x4B3445424533303445422D45474346202020
Memory Module: BANK 1/DIMM0, 8 GB, DDR3, 1867 MHz, 0x80CE, 0x4B3445424533303445422D45474346202020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x156), Broadcom BCM43xx 1.0 (7.21.171.130.1a1)
Bluetooth: Version 5.0.5f1, 3 services, 27 devices, 1 incoming serial ports
Network Service: Ethernet, Ethernet, en0
Serial ATA Device: Samsung SSD 840 EVO 250GB, 250,06 GB
USB Device: USB 3.0 Bus
USB Device: Samsung M3 Portable
USB Device: Bluetooth USB Host Controller
USB Device: FaceTime HD Camera (Built-in)
Thunderbolt Bus: iMac, Apple Inc., 27.4
Flags: needinfo?(5423938)
I have some details regarding the "crash only happens when having firefox in foreground and focused":

I have a multi-screen setup, and each screen has its own menubar. Each menubar shows the title of the current app of the corresponding screen.

The crash only happens when I switch locations from the menubar IF the menubar shows Firefox as the current application.
If I am using firefox in one screen only and then switch locations using the menubar from another screen, I have no error.
I had the same problem running in Yosemite. Upgraded a few days ago to High Sierra 10.13.2, Firefox 56.0.2 and Firefox no longer crashes when trying to switch network locations. However, the network location does NOT change, you simply do not get a crash.

1. Launch Firefox
2. With Firefox in foreground, select another location from the Apple Menu > Location menu.
3. Re-check network location to confirm it has not changed.
Able to reproduce. Looking into it.
Assignee: nobody → spohl.mozilla.bugs
Status: UNCONFIRMED → ASSIGNED
Ever confirmed: true
Flags: needinfo?(twalker)
Priority: -- → P1
I'm able to reproduce this crash all the way back to the oldest build in mozregression. When the network location changes, the system calls HIS_XPC_SetNetworkLocation in HIServices. HIS_XPC_SetNetworkLocation forks our process. It is the new process that crashes when calling nano_reinit_lock in _malloc_fork_child. This happens in fork before exec.

Markus, would it be possible to swizzle HIS_XPC_SetNetworkLocation and make it a no-op to avoid these crashes? Or are there concerns with this?
Flags: needinfo?(mstange)
Hopper decompiles HIS_XPC_SetNetworkLocation to this:

> void _HIS_XPC_SetNetworkLocation(int arg0, int arg1, int arg2) {
>   rbx = arg0;
>   r15 = *___stack_chk_guard;
>   r15 = *r15;
>   var_20 = r15;
>   if (rbx != 0x0) {
>     if (__isAppSandboxed() != 0x0) {
>       // ...
>     } else {
>       CFStringGetCString(rbx, &var_130, 0x100, 0x600);
>       rax = fork();
>       if (rax != 0x0) {
>         waitpid(rax, &var_134, 0x0);
>       } else {
>         execl("/usr/sbin/scselect", "/usr/sbin/scselect");
>       }
>     }
>   }
>   if (r15 != var_20) {
>     __stack_chk_fail();
>   }
>   return;
> }

So it wants to run scselect and make the current process block until that's complete. I don't know what the reason for that is, but presumably there is a reason.

I think it would be preferable if our process could fork without crashing.

Do you have a complete stack for the crash?

It looks like there was a similar problem in bug 1359624 which has been worked around, and it had crash stacks like this: https://crash-stats.mozilla.com/report/index/f44b50dc-7136-4f58-bf5d-bc0410180116

I think the problem there was that the random number generator wanted to free its RNG state, but used different allocators for allocating and freeing the state. Maybe we have a similar problem here.
Flags: needinfo?(mstange)
The stack of the parent process (the Firefox process that is getting forked and does not crash) at the time of the crash is:

(lldb) bt
* thread #77, queue = 'com.apple.root.default-qos', stop reason = breakpoint 1.1
  * frame #0: 0x00007fff92741a8b HIServices`HIS_XPC_SetNetworkLocation
    frame #1: 0x00007fff931071b0 HIToolbox`___ZL14SwitchLocationP13OpaqueMenuReft_block_invoke + 18
    frame #2: 0x00007fffa918c524 libdispatch.dylib`_dispatch_call_block_and_release + 12
    frame #3: 0x00007fffa91838fc libdispatch.dylib`_dispatch_client_callout + 8
    frame #4: 0x00007fffa9192196 libdispatch.dylib`_dispatch_queue_override_invoke + 743
    frame #5: 0x00007fffa91856b5 libdispatch.dylib`_dispatch_root_queue_drain + 476
    frame #6: 0x00007fffa918548c libdispatch.dylib`_dispatch_worker_thread3 + 99
    frame #7: 0x00007fffa93d25a2 libsystem_pthread.dylib`_pthread_wqthread + 1299
    frame #8: 0x00007fffa93d207d libsystem_pthread.dylib`start_wqthread + 13

The stack of the child process (the Firefox process that crashes and was created by forking the parent process above) at the time of the crash is:

Thread 0 Crashed:: Dispatch queue: com.apple.root.default-qos
0   libsystem_malloc.dylib        	0x00007fff8f729f8a nano_forked_calloc + 11
1   libsystem_malloc.dylib        	0x00007fff8f71bb90 malloc_zone_calloc + 78
2   libsystem_malloc.dylib        	0x00007fff8f71c546 calloc + 49
3   libobjc.A.dylib               	0x00007fff8cd67c12 class_createInstance + 133
4   libdispatch.dylib             	0x00007fff8bb68ce1 _os_object_alloc_realized + 38
5   libxpc.dylib                  	0x00007fff8515dea9 _xpc_pipe_create + 61
6   libxpc.dylib                  	0x00007fff8517347d xpc_atfork_child + 117
7   libSystem.B.dylib             	0x00007fff8c7dfb9f libSystem_atfork_child + 54
8   libsystem_c.dylib             	0x00007fff8acbfee0 fork + 29
9   com.apple.HIServices          	0x00007fff883720f7 HIS_XPC_SetNetworkLocation + 271
10  com.apple.HIToolbox           	0x00007fff88ad4d99 ___ZL14SwitchLocationP13OpaqueMenuReft_block_invoke + 18
11  libdispatch.dylib             	0x00007fff8bb6c700 _dispatch_call_block_and_release + 12
12  libdispatch.dylib             	0x00007fff8bb68e73 _dispatch_client_callout + 8
13  libdispatch.dylib             	0x00007fff8bb6bdc7 _dispatch_root_queue_drain + 935
14  libdispatch.dylib             	0x00007fff8bb6ba1c _dispatch_worker_thread3 + 91
15  libsystem_pthread.dylib       	0x00007fff8ab90a9d _pthread_wqthread + 729
16  libsystem_pthread.dylib       	0x00007fff8ab8e3dd start_wqthread + 13

This does seem to indicate that we're crashing during memory allocation in fork in the child process. I'm not familiar with our allocator(s) and whether we use several different ones or not. Could it be that the OS uses libsystem_malloc.dylib as allocator during forking regardless of what allocators Firefox was using? And could it be that libsystem_malloc.dylib allocates memory regions in a way that results in memory regions stomping on each other that were fine with the allocators used by the parent Firefox process before? This is just a theory, but if this is the case I'm not sure we'll be able to fix this without swizzling HIS_XPC_SetNetworkLocation and skipping forking of our process. I'm also concerned that even if we fix this crash with the current state of Firefox, future changes to our allocator(s) may bring this crash back without warning and without clear correlation to the offending changes.

It is true that there is probably a reason why the OS is trying to fork our process and call scselect. However, the child process is currently crashing before scselect is run and swizzling HIS_XPC_SetNetworkLocation would simply prevent the child process crash. I agree with you that avoiding swizzling would be preferable, if possible.

Setting n-i in case you had any thoughts.
Flags: needinfo?(mstange)
Mike, can you shed light on this?
Flags: needinfo?(mstange) → needinfo?(mh+mozilla)
(In reply to Stephen A Pohl [:spohl] from comment #16)
> I'm able to reproduce this crash all the way back to the oldest build in
> mozregression.

What are your STR and on what OSX version?
It has been a struggle to find a way to reproduce, but here's what finally worked for me:
1. Create two network locations in System Preferences. One for LAN, one for WiFi.
2. Create a new standard user account.
3. Log into standard user account.
4. Start Firefox and keep it in the foreground.
5. Click on the Apple icon in the top right corner (macOS menu bar).
6. Under "Location", switch from one location to the other.
7. If no macOS crash dialog opens, check /Applications/Utilities/Console.app for a crash report.

The macOS crash dialog failed to appear for me at first. I was able to make it appear by executing the following in Terminal:

> defaults write com.apple.CrashReporter DialogType crashreport

I'm able to reproduce this on 10.12.6 but there is no indication that this is OS version specific.
So... I unfortunately can't reproduce a crash. All I'm getting is that it doesn't work and I have a forked process sucking CPU on what seems to be a recursive spin lock during abort():

    frame #0: 0x00007fffad728ae4 libsystem_platform.dylib`_os_unfair_lock_recursive_abort + 23
    frame #1: 0x00007fffad728405 libsystem_platform.dylib`_os_unfair_lock_lock_slow + 181
  * frame #2: 0x00007fffad5b0a16 libsystem_c.dylib`setenv + 79
    frame #3: 0x0000000106a2a76d XUL`___lldb_unnamed_symbol193105$$XUL + 5261
    frame #4: 0x0000000106a342eb XUL`___lldb_unnamed_symbol193243$$XUL + 587
    frame #5: 0x0000000106a3472f XUL`___lldb_unnamed_symbol193246$$XUL + 63
    frame #6: 0x00007fffad725b3a libsystem_platform.dylib`_sigtramp + 26
    frame #7: 0x00007fffad644d43 libsystem_kernel.dylib`__pthread_kill + 11
    frame #8: 0x00007fffad732457 libsystem_pthread.dylib`pthread_kill + 90
    frame #9: 0x00007fffad5aa420 libsystem_c.dylib`abort + 129
    frame #10: 0x00007fffad69b0ad libsystem_malloc.dylib`realloc + 413
    frame #11: 0x00007fffad5b0580 libsystem_c.dylib`__setenv_locked + 458
    frame #12: 0x00007fffad5b0a53 libsystem_c.dylib`setenv + 140
    frame #13: 0x0000000106a2a76d XUL`___lldb_unnamed_symbol193105$$XUL + 5261
    frame #14: 0x0000000106a342eb XUL`___lldb_unnamed_symbol193243$$XUL + 587
    frame #15: 0x0000000106a3472f XUL`___lldb_unnamed_symbol193246$$XUL + 63
    frame #16: 0x00007fffad725b3a libsystem_platform.dylib`_sigtramp + 26
    frame #17: 0x00007fffad644d43 libsystem_kernel.dylib`__pthread_kill + 11
    frame #18: 0x00007fffad732457 libsystem_pthread.dylib`pthread_kill + 90
    frame #19: 0x00007fffad5aa420 libsystem_c.dylib`abort + 129
    frame #20: 0x00007fffad699fe7 libsystem_malloc.dylib`free + 530
    frame #21: 0x00007fffad5715a7 libsystem_c.dylib`_arc4_fork_child + 108
    frame #22: 0x00007fffad55c028 libsystem_c.dylib`_libc_fork_child + 25
    frame #23: 0x00007fffabefab0d libSystem.B.dylib`libSystem_atfork_child + 29
    frame #24: 0x00007fffad55c437 libsystem_c.dylib`fork + 47
    frame #25: 0x00007fff96670ba0 HIServices`HIS_XPC_SetNetworkLocation + 277
    frame #26: 0x00007fff970341b0 HIToolbox`___ZL14SwitchLocationP13OpaqueMenuReft_block_invoke + 18
    frame #27: 0x00007fffad4e9524 libdispatch.dylib`_dispatch_call_block_and_release + 12
    frame #28: 0x00007fffad4e08fc libdispatch.dylib`_dispatch_client_callout + 8
    frame #29: 0x00007fffad4ef196 libdispatch.dylib`_dispatch_queue_override_invoke + 743
    frame #30: 0x00007fffad4e26b5 libdispatch.dylib`_dispatch_root_queue_drain + 476
    frame #31: 0x00007fffad4e248c libdispatch.dylib`_dispatch_worker_thread3 + 99
    frame #32: 0x00007fffad72f5a2 libsystem_pthread.dylib`_pthread_wqthread + 1299
    frame #33: 0x00007fffad72f07d libsystem_pthread.dylib`start_wqthread + 13

That's not much better, because it means the network location change doesn't work either, but that makes it hard to tell anything about the crash you're seeing. I'm going to try building libsystem from the apple open source code, and see if I can get more insight into what's happening on my mac, though.
Flags: needinfo?(mh+mozilla)
I haven't been successful in building libsystem to debug my own problem... Now, I do know that I've been able to build libsystem_malloc successfully in the past, so you should be able to do the same. The sources for 10.12.6 are in https://opensource.apple.com/tarballs/libmalloc/libmalloc-116.50.8.tar.gz.

The source for the crashing function is in https://opensource.apple.com/source/libmalloc/libmalloc-116.50.8/src/nano_malloc.c.auto.html, and reads:

static void *
nano_forked_calloc(nanozone_t *nanozone, size_t num_items, size_t size)
{
	malloc_zone_t *zone = (malloc_zone_t *)(nanozone->helper_zone);
	return zone->calloc(zone, num_items, size);
}

It would be good to know on which one of those two lines the crash happens. It's likely to be the second one, but just in case... That would suggest the nano zone is not initialized with a correct helper zone, so you'd probably want to check what's calling create_nano_zone and why that is happening.
Aha! I do get a crash with Nightly (I was trying release), in nano_reinit_lock, which reads:

static void
nano_reinit_lock(nanozone_t *nanozone)
{
	int i;

	for (i = 0; i < nanozone->phys_ncpus; ++i) {
		_malloc_lock_init(&nanozone->band_resupply_lock[i]);
	}
}

The only way I can see this crashing itself (and not in _malloc_lock_init) is through a null deref, so nanozone being null. But this really shouldn't be happening. I can't figure out how to attach to that crashing process though...
(In reply to Mike Hommey [:glandium] from comment #24)
> Aha! I do get a crash with Nightly (I was trying release), in
> nano_reinit_lock, which reads:
> 
> static void
> nano_reinit_lock(nanozone_t *nanozone)
> {
> 	int i;
> 
> 	for (i = 0; i < nanozone->phys_ncpus; ++i) {
> 		_malloc_lock_init(&nanozone->band_resupply_lock[i]);
> 	}
> }
> 
> The only way I can see this crashing itself (and not in _malloc_lock_init)
> is through a null deref, so nanozone being null. But this really shouldn't
> be happening. I can't figure out how to attach to that crashing process
> though...

Does attaching to the parent before the fork and setting "set follow-fork-mode child" work?
Flags: needinfo?(mh+mozilla)
AFAIK, lldb doesn't support that, and gdb doesn't seem to work properly on my machine.
Flags: needinfo?(mh+mozilla)
Sorry, I was referencing old gdb notes of mine. I found:
https://stackoverflow.com/questions/14746315/how-to-attach-to-child-process-in-lldb

I'm not sure if a waiting lldb process will be able to attach to the forked process before the crash though. Will try to give this a shot tonight.
(In reply to Stephen A Pohl [:spohl] from comment #27)
> Sorry, I was referencing old gdb notes of mine. I found:
> https://stackoverflow.com/questions/14746315/how-to-attach-to-child-process-
> in-lldb
> 
> I'm not sure if a waiting lldb process will be able to attach to the forked
> process before the crash though. Will try to give this a shot tonight.

This didn't work. The child process crashes before lldb can attach.

I also went ahead and built gdb to see if I could use "set follow-fork-mode child" (comment 25) to debug the child process. Unfortunately, this doesn't work either. The child process still crashes. gdb ends in a hung state and needs to be killed via Terminal without providing any meaningful info.

Setting n-i in case you had any other thoughts.
Flags: needinfo?(mh+mozilla)
Maybe try building libmalloc, with a nano_reinit_lock modified such that it enters an infinite loop if nanozone is null?
Flags: needinfo?(mh+mozilla)
(In reply to Mike Hommey [:glandium] from comment #29)
> Maybe try building libmalloc, with a nano_reinit_lock modified such that it
> enters an infinite loop if nanozone is null?

Ok, so this was fun. I wasn't able to build libmalloc successfully because I ran into simply too many errors to fix. I went ahead and patched libsystem_malloc.dylib instead (attached). Hopper Disassembler shows the original disassembly for nano_reinit_lock as:

                     _nano_reinit_lock:
0000000000014d67         cmp        dword [rdi+0x11288], 0x0
0000000000014d6e         je         loc_14d8b
0000000000014d70         xor        eax, eax
0000000000014d72         mov        dword [rdi+rax*4+0x11000], 0x0
0000000000014d7d         inc        rax
0000000000014d80         mov        ecx, dword [rdi+0x11288]
0000000000014d86         cmp        rax, rcx
0000000000014d89         jb         loc_14d72
0000000000014d8b         ret

I changed the first nine bytes with a jmp back to itself at the start plus noop instructions, resulting in:

                     _nano_reinit_lock:
0000000000014d67         jmp        _nano_reinit_lock
0000000000014d6c         align      16
0000000000014d70         xor        eax, eax
0000000000014d72         mov        dword [rdi+rax*4+0x11000], 0x0
0000000000014d7d         inc        rax
0000000000014d80         mov        ecx, dword [rdi+0x11288]
0000000000014d86         cmp        rax, rcx
0000000000014d89         jb         loc_14d72
0000000000014d8b         ret

To run this, several steps need to be taken:
1. Restart the system and hold cmd-R during startup.
2. Once recovery mode starts, open a Terminal window from Utilities in the menu bar.
3. Enter "csrutil disable" to disable System Integrity Protection. This is required to replace the .dylib in /usr/lib/system.
4. Restart the system.
5. Save a backup copy of /usr/lib/system/libsystem_malloc.dylib.
6. Copy the attached .dylib to /usr/lib/system, replacing the existing one. IMPORTANT: do not move the original libsystem_malloc.dylib first without leaving a valid library in its place! This will leave your system in a broken state and you will have to recover by entering recovery mode by pressing cmd-R during startup.
7. Launch Firefox and reproduce the issue. The forked process will wait in nano_reinit_lock for a debugger to attach.
8. You can immediately restore the original libsystem_malloc.dylib file after launching Firefox to minimize possible issues from the modified library. The modified library will continue to be loaded in memory to debug Firefox.
9. IMPORTANT: restore the original libsystem_malloc.dylib as soon as possible, but imperatively before restarting your system or your system will not start (most likely because processes get forked during startup).
10. Don't forget to reenable System Integrity Protection by entering "csrutil enable" in Terminal in recovery mode (opposite of step 2 above).

(In reply to Mike Hommey [:glandium] from comment #24)
> Aha! I do get a crash with Nightly (I was trying release), in
> nano_reinit_lock, which reads:
> 
> static void
> nano_reinit_lock(nanozone_t *nanozone)
> {
> 	int i;
> 
> 	for (i = 0; i < nanozone->phys_ncpus; ++i) {
> 		_malloc_lock_init(&nanozone->band_resupply_lock[i]);
> 	}
> }
> 
> The only way I can see this crashing itself (and not in _malloc_lock_init)
> is through a null deref, so nanozone being null. But this really shouldn't
> be happening. I can't figure out how to attach to that crashing process
> though...

I was able to successfully attach to the child process and debug in lldb. Debugging showed that the crash occurs at offset +0xB (+11) into the function, confirming the offsets given in the crash dumps such as in comment 9:

(lldb) si
Process 12557 stopped
* thread #1, queue = 'com.apple.root.default-qos', stop reason = EXC_BAD_ACCESS (code=2, address=0x10541f840)
    frame #0: 0x0000000105467d72 libsystem_malloc.dylib`nano_reinit_lock + 11
libsystem_malloc.dylib`nano_reinit_lock:
->  0x105467d72 <+11>: movl   $0x0, 0x11000(%rdi,%rax,4)
    0x105467d7d <+22>: incq   %rax
    0x105467d80 <+25>: movl   0x11288(%rdi), %ecx
    0x105467d86 <+31>: cmpq   %rcx, %rax
Target 0: (firefox) stopped.
(lldb) p $rdi
(unsigned long) $5 = 4383107136

Offset +0xB into the function is part of the body of the for loop. So this isn't crashing due to a null nanozone, or we would have crashed at offset +0 into the function.

$rdi holds the address for nanozone. Looking at the crash log in comment 9 again, there is additional info about the memory region around the crashing address:

VM Regions Near 0x1041cb470:
    __DATA                 00000001041ba000-00000001041bb000 [    4K] rw-/rwx SM=COW  /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib
--> __LINKEDIT             00000001041bb000-00000001041d1000 [   88K] r--/rwx SM=COW  /Applications/FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib
    MALLOC guard page      00000001041d1000-00000001041d2000 [    4K] ---/rwx SM=NUL

So we seem to be trying to access a memory location inside the __DATA region pertaining to FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib, which seems to be readable and writable. This is about as far as I got. Could libmozglue.dylib be the culprit for some reason?

One more thing that may or may not be helpful: I've noticed that I'm unable to reproduce the crash if I launch the Firefox.app/Contents/MacOS/firefox binary directly from Terminal. The crash only occurs if I launch the Firefox.app bundle by either double-clicking on it or calling 'open Firefox.app' in Terminal.
Flags: needinfo?(mh+mozilla)
> To run this, several steps need to be taken:

Waw, that's a lot of hoops to go through. Doesn't using DYLD_LIBRARY_PATH or DYLD_INSERT_LIBRARIES work anymore? I remember having used that in the past to replace libsystem_malloc.dylib.

> So we seem to be trying to access a memory location inside the __DATA region pertaining to FirefoxDeveloperEdition.app/Contents/MacOS/libmozglue.dylib

That seems wrong. Per nano_malloc.c, a nanozone_t is supposed to come from create_nano_zone, which allocates them. That can't end up in a __DATA segment. So for some reason, nano_reinit_lock is being called with a normal malloc zone (ours), and that'd be the cause of all trouble. But I don't see how that function is supposed to end up being called with our zone... I guess I should try booting my mac and see for myself.
Flags: needinfo?(mh+mozilla)
(In reply to Mike Hommey [:glandium] from comment #31)
> > To run this, several steps need to be taken:
> 
> Waw, that's a lot of hoops to go through. Doesn't using DYLD_LIBRARY_PATH or
> DYLD_INSERT_LIBRARIES work anymore? I remember having used that in the past
> to replace libsystem_malloc.dylib.

So, the reason why this didn't work for me is because I couldn't reproduce the crash if I ran the firefox binary directly from Terminal. Maybe it would work with 'open Firefox.app', but I didn't try.
So, I can confirm this doesn't crash when running directly from Terminal, which makes using DYLD_* harder. So I tried something sneaky, which is to launch Firefox with open or from the icon, use the browser console to set the environment variable (Cc["@mozilla.org/process/environment;1"].getService(Ci.nsIEnvironment).set("DYLD_LIBRARY_PATH", "...")) and restart the browser (Services.startup.quit(Ci.nsIAppStartup.eAttemptQuit | Ci.nsIAppStartup.eRestart)), and successfully got a Firefox with the environment variable set (and I double checked, your patched libsystem_malloc.dylib was loaded). Unfortunately, it seems this is not happening after Firefox restarts either (confirmed by trying again with just a restart).
Found how things are going wrong:

This all starts in _malloc_fork_child from https://opensource.apple.com/source/libmalloc/libmalloc-116.50.8/src/malloc.c.auto.html :

// Called in the child process after fork() to resume normal operation.
void
_malloc_fork_child(void)
{
#if CONFIG_NANOZONE
	if (_malloc_initialize_pred && _malloc_engaged_nano) {
		nano_forked_zone((nanozone_t *)inline_malloc_default_zone());
	}
#endif
	return _malloc_reinit_lock_all(&__stack_logging_fork_child);
}

Both _malloc_initialize_pref and _malloc_engaged_nano are true (I /think/ the reason it doesn't happen when launching from the terminal or after a restart is that in that case _malloc_engaged_nano might be false).

So nano_forked_zone is called with the result of inline_malloc_default_zone. The latter returns our zone, which we subtly set as the default zone. What does the former do ? The answer is in https://opensource.apple.com/source/libmalloc/libmalloc-116.50.8/src/nano_malloc.c.auto.html :

void
nano_forked_zone(nanozone_t *nanozone)
{
	/*
	 * Hobble the nano zone in the child of a fork prior to an exec since
	 * the state of the zone can be made inconsistent by a parent thread while the
	 * fork is underway.
	 * All new allocations will be referred to the helper zone (which is more stable.)
	 * All free()'s of existing nano objects will be leaked.
	 */

	mprotect(nanozone, sizeof(nanozone->basic_zone), PROT_READ | PROT_WRITE);

	nanozone->basic_zone.size = (void *)nano_size; /* Unchanged. */
	nanozone->basic_zone.malloc = (void *)nano_forked_malloc;
	nanozone->basic_zone.calloc = (void *)nano_forked_calloc;
	nanozone->basic_zone.valloc = (void *)nano_valloc; /* Unchanged, already always obtained from helper zone. */
	nanozone->basic_zone.free = (void *)nano_forked_free;
	nanozone->basic_zone.realloc = (void *)nano_forked_realloc;
	nanozone->basic_zone.destroy = (void *)nano_destroy; /* Unchanged. */
	nanozone->basic_zone.batch_malloc = (void *)nano_forked_batch_malloc;
	nanozone->basic_zone.batch_free = (void *)nano_forked_batch_free;
	nanozone->basic_zone.introspect = (struct malloc_introspection_t *)&nano_introspect; /* Unchanged. */
	nanozone->basic_zone.memalign = (void *)nano_memalign;								 /* Unchanged. */
	nanozone->basic_zone.free_definite_size = (void *)nano_forked_free_definite_size;

	mprotect(nanozone, sizeof(nanozone->basic_zone), PROT_READ);
}

The definition of nanozone_t starts with a malloc_zone_t field named basic_zone (see https://opensource.apple.com/source/libmalloc/libmalloc-116.50.8/src/nano_zone.h.auto.html ). Practically speaking, since the function gets a pointer to our zone, it means this function is forcefully overwriting pointers in our zone.

One of them now points to nano_introspect, which contains the pointer to nano_reinit_lock.

We get back to _malloc_fork_child, which then calls _malloc_reinit_lock_all, which iterates over all zones, and calls the introspect.reinit_lock function, which, per the above, now points to nano_reinit_lock, with a pointer to the zone. nano_reinit_lock then expects that to be a nanozone, which it is not. Thus the crash.

I'm surprised we haven't hit problems with this earlier...
Component: Widget: Cocoa → Memory Allocator
> I /think/ the reason it doesn't happen when launching from the terminal or after a restart is that in that case _malloc_engaged_nano might be false.

I've now confirmed this hypothesis with "expr (int)malloc_engaged_nano()" in lldb attached to firefox launched from the terminal or after a restart. Which is interesting, because it means when we restart firefox after e.g. an upgrade, it doesn't run the same as when it's launched "normally".
Incidentally, this means we can make it happen when running from the Terminal by setting MallocNanoZone to 1 in the environment.
FWIW, when running "normally", MallocNanoZone is enabled through the "apple" argument to __malloc_init, from libSystem_initializer: https://opensource.apple.com/source/Libsystem/Libsystem-1238.60.2/init.c.auto.html

That function is a constructor, so that all comes from the dynamic linker. No idea why restarting Firefox (which we do with NSTask) doesn't preserve that.
The dynamic linker gets that from the kernel, in data that follows envp: see the start function in https://opensource.apple.com/source/dyld/dyld-433.5/src/dyldInitialization.cpp.auto.html .
And the kernel engages it when the posix_spawn flags contain _POSIX_SPAWN_NANO_ALLOCATOR: see function exec_add_apple_strings in https://opensource.apple.com/source/xnu/xnu-3789.70.16/bsd/kern/kern_exec.c.auto.html .

Unfortunately, there doesn't seem to be any public reference to that flag outside the xnu source. It must be set by some of the closed source stuff in OSX. At least launchctl seems to have a flag to disable the nano allocator for services. I don't know if we can do better than reexecuting ourselves with MallocNanoZone set to 0 in the environment when we detect that the nano allocator is engaged.
I grepped my OSX install for MallocNanoZone, and found this snippet in Xcode's Info.plist:

<key>LSEnvironment</key>
<dict>
  <key>MallocNanoZone</key>
  <string>0</string>
</dict>

which is practically speaking the equivalent of setting MallocNanoZone to 0 in the environment. I've validated that's what happens for Xcode when I launch it. I tried editing the Info.plist from my nightly directly, but that unfortunately didn't seem to work. I'll try see what happens with a try build.
Ok, this works if I edit Info.plist before I use the application the first time. OSX must cache it.
Assignee: spohl.mozilla.bugs → mh+mozilla
Note that instead of crashes, depending on how libmozglue.dylib is laid out, this could lead to memory corruption.
Comment on attachment 8947007 [details]
Bug 1424709 - Force disable the OSX system "nano allocator".

https://reviewboard.mozilla.org/r/216830/#review222710

I can confirm that this fixes the crash for me as well. Thank you for the sleuthing!
Attachment #8947007 - Flags: review?(spohl.mozilla.bugs) → review+
Attachment #8946971 - Attachment description: libsystem_malloc.dylib → patched libsystem_malloc.dylib, will hang in nano_reinit_lock
Never realized it would be so complicated to figure out, grateful for your relentless efforts :)
I added a comment in zone.c to point to the Info.plist, because it's not obvious there's some memory allocator related work around in there.
Pushed by mh@glandium.org:
https://hg.mozilla.org/integration/autoland/rev/bf1efa161edb
Force disable the OSX system "nano allocator". r=spohl
Comment on attachment 8947007 [details]
Bug 1424709 - Force disable the OSX system "nano allocator".

Approval Request Comment
[Feature/Bug causing the regression]: Integration of the memory allocator on OSX 
[User impact if declined]: Crashes or memory corruptions on fork(). Fork() can be triggered by system libraries (like in the case of network location change like this bug) or by our code. At least in the case of this bug, the crash was not caught by our crash reporter, so we're also blind about those crashes.
[Is this code covered by automated tests?]: No
[Has the fix been verified in Nightly?]: Verified with local builds and try.
[Needs manual test from QE? If yes, steps to reproduce]: See comment 21.
[List of other uplifts needed for the feature/fix]: N/A
[Is the change risky?]: No
[Why is the change risky/not risky?]: The change effectively sets an environment variable that disables a system feature that we actually don't use, but that only causes problems when fork() is called.
[String changes made/needed]: N/A

Note that for esr52 the change in zone.c might not apply because I think the file moved between then and now, but it doesn't matter, it's only a comment.
Attachment #8947007 - Flags: approval-mozilla-esr52?
Attachment #8947007 - Flags: approval-mozilla-beta?
https://hg.mozilla.org/mozilla-central/rev/bf1efa161edb
Status: ASSIGNED → RESOLVED
Closed: 6 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla60
Comment on attachment 8947007 [details]
Bug 1424709 - Force disable the OSX system "nano allocator".

Let's give this a try on beta for the 59 beta 7 build.
Attachment #8947007 - Flags: approval-mozilla-beta? → approval-mozilla-beta+
Flags: qe-verify+
FWIW I do not get a repro anymore on nightly, 60.0a1 (2018-02-09) (64-bit), but my bug was slightly different. Bug 1423273
(In reply to deepak from comment #46)
> Never realized it would be so complicated to figure out, grateful for your
> relentless efforts :)

Same here, thanks to all involved!
I've tried to reproduce this issue using an affected Nightly build from 2017-12-11 on macOS 10.12 and Mac OS X 10.11, but unfortunately, I was not able to reproduce it. I followed the steps from comment 0 and comment 21.

Hi taebox, I've seen that you already verified this bug on latest Nightly, could you please help us verifying this in latest Beta 59 (https://archive.mozilla.org/pub/firefox/candidates/) too, so we can close this bug, if there are no other concerns?

Thanks in advance!
Flags: needinfo?(taebox)
I just tried this on 59.0b10 (64-bit) and I get no repro.
Flags: needinfo?(taebox)
MacOS 10.12.6
Thank you!
Status: RESOLVED → VERIFIED
Flags: qe-verify+
Comment on attachment 8947007 [details]
Bug 1424709 - Force disable the OSX system "nano allocator".

From IRC discussion with spohl, it's difficult to measure how many people are affected by this, but it's potentially large and a reasonably easy to hit situation. Since the patch is basically a one-liner, let's take this for ESR 52.7.0 as well.
Attachment #8947007 - Flags: approval-mozilla-esr52? → approval-mozilla-esr52+
It appears that the disabling of the Nano Allocator has broken WebVR on macOS (Bug 1454204).

WebVR for macOS is going to release in FF60 but is now broken in FF60.  I can confirm that reversing the changes in the info.plist file corrects it.
Hello Mike,

Was there any other way to fix this without disabling the Nano Allocator?  Otherwise, perhaps you may have some hints as to why this might break IPC with SteamVR on macOS? (see gfx/vr/openvr)
Flags: needinfo?(mh+mozilla)
As mentioned in comment 35, the nano allocator was already disabled when running Firefox from the terminal, or after a restart (like, after an upgrade, or through about:support). So even reverting the change from this bug would still leave broken cases.
Also, it's weird that this would break SteamVR... how is it initialized? do we spawn it from our process?
Flags: needinfo?(mh+mozilla) → needinfo?(kgilbert)
(In reply to Mike Hommey [:glandium] from comment #66)
> As mentioned in comment 35, the nano allocator was already disabled when
> running Firefox from the terminal, or after a restart (like, after an
> upgrade, or through about:support). So even reverting the change from this
> bug would still leave broken cases.
> Also, it's weird that this would break SteamVR... how is it initialized? do
> we spawn it from our process?

Very interesting...  This may explain why WebVR for macOS never worked when I started Firefox from the command line, only when running from the app bundle.

The code here interfaces with the Steam VR services:

https://dxr.mozilla.org/mozilla-central/source/gfx/vr/openvr/src

Essentially, some environment variables and configuration files are used to identify the location of a library which is dynamically loaded into our GPU process.  The library then launches and communicates with some services running in other processes.
Flags: needinfo?(kgilbert)
We are planning to move much of our code to a separate process, which would include the affected SteamVR / OpenVR code.  Perhaps this separate process could be spawned with the nano allocator enabled..
It would be best to figure out why SteamVR/OpenVR fails when the nano allocator is disabled, because that doesn't make much sense. I guess, however, that this is not reproducing without have a Vive, so I won't be able to help there... at least not before the all hands, at which point we could find some time there to sit down and (try to) figure it out.

In the meanwhile, what /might/ work is to set the MallocNanoZone environment variable in the GPU process, assuming it's a separate process.
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