1050993 - Assertion failure in TimeStamp::operator-: "Cannot compute with aOther null value"

Status: RESOLVED INVALID

(Core :: Layout, defect)

Description

[Botond Ballo [:botond]]

While playing with the test case posted in https://bugzilla.mozilla.org/show_bug.cgi?id=1050789#c5 on a B2G debug build, I encountered the following assertion:

Program received signal SIGSEGV, Segmentation fault.
0xb4a2bd94 in mozilla::TimeStamp::operator- (this=<optimized out>, aOther=<optimized out>) at ../../dist/include/mozilla/TimeStamp.h:305
305         MOZ_ASSERT(!aOther.IsNull(), "Cannot compute with aOther null value");
(gdb) i s
#0  0xb4a2bd94 in mozilla::TimeStamp::operator- (this=<optimized out>, aOther=<optimized out>) at ../../dist/include/mozilla/TimeStamp.h:305
#1  0xb58fbb6c in mozilla::layout::ScrollbarActivity::UpdateOpacity (this=0xb2e2bac0, aTime=...) at ../../../layout/generic/ScrollbarActivity.cpp:366
#2  0xb58fbe82 in mozilla::layout::ScrollbarActivity::WillRefresh (this=0xb2e2bac0, aTime=...) at ../../../layout/generic/ScrollbarActivity.cpp:137
#3  0xb588a010 in nsRefreshDriver::Tick (this=0xb2f1c540, aNowEpoch=<optimized out>, aNowTime=...) at ../../../layout/base/nsRefreshDriver.cpp:1119
#4  0xb588ab48 in mozilla::RefreshDriverTimer::Tick (this=0xb233bd00) at ../../../layout/base/nsRefreshDriver.cpp:162
#5  0xb4a6549a in nsTimerImpl::Fire (this=0xb283ce20) at ../../../xpcom/threads/nsTimerImpl.cpp:618
#6  0xb4a6561e in nsTimerEvent::Run (this=0xb2317130) at ../../../xpcom/threads/nsTimerImpl.cpp:711
#7  0xb4a62f6e in ProcessNextEvent (aResult=0xbefa4cb7, aMayWait=true, this=0xb3a48880) at ../../../xpcom/threads/nsThread.cpp:766
#8  nsThread::ProcessNextEvent (this=0xb3a48880, aMayWait=<optimized out>, aResult=0xbefa4cb7) at ../../../xpcom/threads/nsThread.cpp:685
#9  0xb4a77084 in NS_ProcessNextEvent (aThread=0xb3a48880, aMayWait=<optimized out>) at /home/botond/dev/mozilla/central/xpcom/glue/nsThreadUtils.cpp:265
#10 0xb4c26b6e in mozilla::ipc::MessagePump::Run (this=0xb3a01c70, aDelegate=0xbefa4e10) at ../../../ipc/glue/MessagePump.cpp:140                                                              
#11 0xb4c14ace in MessageLoop::RunInternal (this=0xbefa4e10) at ../../../ipc/chromium/src/base/message_loop.cc:229                                                                                                 
#12 0xb4c14ae6 in RunHandler (this=0xbefa4e10) at ../../../ipc/chromium/src/base/message_loop.cc:222                                                                                                               
#13 MessageLoop::Run (this=0xbefa4e10) at ../../../ipc/chromium/src/base/message_loop.cc:196                                                                                                                       
#14 0xb5552fc2 in nsBaseAppShell::Run (this=0xb2eb0760) at /home/botond/dev/mozilla/central/widget/xpwidgets/nsBaseAppShell.cpp:164                                                                                
#15 0xb5b7f422 in XRE_RunAppShell () at ../../../toolkit/xre/nsEmbedFunctions.cpp:698                                                                                                                              
#16 0xb4c26c4a in mozilla::ipc::MessagePumpForChildProcess::Run (this=0xb3a01c70, aDelegate=0xbefa4e10) at ../../../ipc/glue/MessagePump.cpp:272                                                                   
#17 0xb4c14ace in MessageLoop::RunInternal (this=0xbefa4e10) at ../../../ipc/chromium/src/base/message_loop.cc:229                                                                                                 
#18 0xb4c14ae6 in RunHandler (this=0xbefa4e10) at ../../../ipc/chromium/src/base/message_loop.cc:222                                                                                                               
#19 MessageLoop::Run (this=0xbefa4e10) at ../../../ipc/chromium/src/base/message_loop.cc:196                                                                                                                       
#20 0xb5b7f2e8 in XRE_InitChildProcess (aArgc=<optimized out>, aArgv=<optimized out>, aProcess=<optimized out>) at ../../../toolkit/xre/nsEmbedFunctions.cpp:535                                                   
#21 0x000092ae in content_process_main (argc=7, argv=0xbefa5904) at ../../../ipc/app/../contentproc/plugin-container.cpp:147

Comment 1

[Intermittent Failures Robot]

1 failures in 762 pushes (0.001 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* autoland: 1

Platform breakdown:
* windows10-64: 1

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1050993&startday=2017-11-13&endday=2017-11-19&tree=all

Comment 2

[Intermittent Failures Robot]

3 failures in 792 pushes (0.004 failures/push) were associated with this bug in the last 7 days.    

Repository breakdown:
* mozilla-inbound: 2
* autoland: 1

Platform breakdown:
* osx-10-10: 3

For more details, see:
https://brasstacks.mozilla.com/orangefactor/?display=Bug&bugid=1050993&startday=2017-11-27&endday=2017-12-03&tree=all

Comment 3

[Botond Ballo [:botond]]

The STR here are not applicable any more (they involve B2G).