Closed Bug 372287 Opened 18 years ago Closed 18 years ago

Sunbird crashes on open in Mac OS 10.3, works in Mac OS 10.4 [@ nsACString_internal::GetReadableBuffer()]

Categories

(Calendar :: Sunbird Only, defect)

Product:
Calendar
Component:
Sunbird Only
Version:
Sunbird 0.3.1
Platform:
PowerPC
macOS
Type:
defect
Priority:
Not set
Severity:
critical

Tracking

(Not tracked)

Status:
VERIFIED FIXED

People

(Reporter: tony, Assigned: mattwillis)

Details

(Keywords: crash)

Crash Data

Attachments

(2 files)

code massage
1.72 KB, patch
Details | Diff | Splinter Review
Patch to maketzdata.pl, tzdata.c, and calICSService.cpp
3.32 KB, patch
dbo
: review+
Details | Diff | Splinter Review
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/418.9.1 (KHTML, like Gecko) Safari/419.3 Build Identifier: http://download.mozilla.org/?product=sunbird-0.3.1&os=osx&lang=en-US Sunbird launches, but it crashes as soon as it tries to open the main window, when run in Mac OS 10.3.9. This error is not reproducible in Mac OS 10.4.8, nor does it occur when running a debug build in Mac OS 10.3.9. Reproducible: Always Steps to Reproduce: 1. Double-click Sunbird. Actual Results: Crashes. Expected Results: Doesn't crash. The crash occurs in nsACString_internal::AsSubstring(), which is triggered by this line in calICSService::LatestTzId(): http://lxr.mozilla.org/mozilla1.8/source/calendar/base/src/calICSService.cpp#1476 Stack trace: Date/Time: 2007-03-01 14:03:36 -0330 OS Version: 10.3.9 (Build 7W98) Report Version: 2 Command: sunbird-bin Path: /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/sunbird-bin Version: 0.3.1 (0.3.1) PID: 498 Thread: 0 Exception: EXC_BAD_ACCESS (0x0001) Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000064 Thread 0 Crashed: 0 libxpcom_core.dylib 0x2c06c6a4 nsACString_internal::GetReadableBuffer(char const**) const + 0x44 1 libxpcom_core.dylib 0x2c06c90c nsACString_internal::ToSubstring() const + 0x28 2 libxpcom_core.dylib 0x2c06b7ec nsACString_internal::Equals(nsACString_internal const&) const + 0x48 3 org.mozilla.sunbird 0x00130188 calICSService::LatestTzId(nsACString_internal const&, nsACString_internal&) + 0x354 4 org.mozilla.sunbird 0x0012a098 calDateTime::GetInTimezone(nsACString_internal const&, calIDateTime**) + 0x130 5 libxpcom_core.dylib 0x2c0550e8 _XPTC_InvokeByIndex + 0xd8 6 org.mozilla.sunbird 0x00398bec XPCWrappedNative::CallMethod(XPCCallContext&, XPCWrappedNative::CallMode) + 0x9dc 7 org.mozilla.sunbird 0x0038b9b8 XPC_WN_CallMethod(JSContext*, JSObject*, unsigned int, long*, long*) + 0xdc 8 libmozjs.dylib 0x2302ff08 js_Invoke + 0x724 9 libmozjs.dylib 0x2303a4b0 js_Interpret + 0x9288 10 libmozjs.dylib 0x2302ff4c js_Invoke + 0x768 11 libmozjs.dylib 0x23031140 js_InvokeConstructor + 0x270 12 libmozjs.dylib 0x23037004 js_Interpret + 0x5ddc 13 libmozjs.dylib 0x2302ff4c js_Invoke + 0x768 14 libmozjs.dylib 0x23030158 js_InternalInvoke + 0xb8 15 libmozjs.dylib 0x230084d8 JS_CallFunctionValue + 0x2c 16 org.mozilla.sunbird 0x004e6018 nsJSContext::CallEventHandler(nsISupports*, void*, void*, nsIArray*, nsIVariant**) + 0x334 17 org.mozilla.sunbird 0x004e2acc nsJSEventListener::HandleEvent(nsIDOMEvent*) + 0x5f0 18 org.mozilla.sunbird 0x001fbe84 nsEventListenerManager::HandleEventSubType(nsListenerStruct*, nsIDOMEventListener*, nsIDOMEvent*, nsISupports*, unsigned int, unsigned int) + 0x1a8 19 org.mozilla.sunbird 0x001fc18c nsEventListenerManager::HandleEvent(nsPresContext*, nsEvent*, nsIDOMEvent**, nsISupports*, unsigned int, nsEventStatus*) + 0x2e4 20 org.mozilla.sunbird 0x00424624 nsEventTargetChainItem::HandleEvent(nsEventChainPostVisitor&, unsigned int) + 0x84 21 org.mozilla.sunbird 0x00424874 nsEventTargetChainItem::HandleEventTargetChain(nsEventChainPostVisitor&, unsigned int, nsDispatchingCallback*) + 0x160 22 org.mozilla.sunbird 0x00424da4 nsEventDispatcher::Dispatch(nsISupports*, nsPresContext*, nsEvent*, nsIDOMEvent*, nsEventStatus*, nsDispatchingCallback*, int) + 0x3c4 23 org.mozilla.sunbird 0x001bbc28 DocumentViewerImpl::LoadComplete(unsigned int) + 0x15c 24 org.mozilla.sunbird 0x00554a00 nsDocShell::EndPageLoad(nsIWebProgress*, nsIChannel*, unsigned int) + 0x70 25 org.mozilla.sunbird 0x002860b8 nsWebShell::EndPageLoad(nsIWebProgress*, nsIChannel*, unsigned int) + 0xd4 26 org.mozilla.sunbird 0x0055482c nsDocShell::OnStateChange(nsIWebProgress*, nsIRequest*, unsigned int, unsigned int) + 0x2e8 27 org.mozilla.sunbird 0x0028919c nsDocLoader::FireOnStateChange(nsIWebProgress*, nsIRequest*, int, unsigned int) + 0x14c 28 org.mozilla.sunbird 0x002885dc nsDocLoader::doStopDocumentLoad(nsIRequest*, unsigned int) + 0x38 29 org.mozilla.sunbird 0x002884f8 nsDocLoader::DocLoaderIsEmpty() + 0x124 30 org.mozilla.sunbird 0x00288274 nsDocLoader::OnStopRequest(nsIRequest*, nsISupports*, unsigned int) + 0x240 31 org.mozilla.sunbird 0x00098114 nsLoadGroup::RemoveRequest(nsIRequest*, nsISupports*, unsigned int) + 0x140 32 org.mozilla.sunbird 0x001e911c nsDocument::DoUnblockOnload() + 0x8c 33 org.mozilla.sunbird 0x008c887c 0x1000 + 0x8c787c 34 libxpcom_core.dylib 0x2c048f8c nsThread::ProcessNextEvent(int, int*) + 0x118 35 libxpcom_core.dylib 0x2c00a374 NS_ProcessNextEvent_P(nsIThread*, int) + 0x4c 36 org.mozilla.sunbird 0x0056bbb0 nsBaseAppShell::Run() + 0x50 37 org.mozilla.sunbird 0x00317e00 nsAppStartup::Run() + 0x58 38 org.mozilla.sunbird 0x00012d8c XRE_main + 0x128c 39 org.mozilla.sunbird 0x0000dac0 start + 0x1c8 40 dyld 0x8fe1a31c _dyld_start + 0x64 Thread 1: 0 libSystem.B.dylib 0x9000b46c select + 0xc 1 libnspr4.dylib 0x2001f3a0 poll + 0x188 2 libnspr4.dylib 0x2001baf0 PR_OpenDir + 0x3c0 3 org.mozilla.sunbird 0x000c3144 nsSocketTransportService::Poll(int, unsigned int*) + 0xb4 4 org.mozilla.sunbird 0x000c3b44 nsSocketTransportService::DoPollIteration(int) + 0x198 5 org.mozilla.sunbird 0x000c3774 nsSocketTransportService::OnProcessNextEvent(nsIThreadInternal*, int, unsigned int) + 0x44 6 libxpcom_core.dylib 0x2c048f10 nsThread::ProcessNextEvent(int, int*) + 0x9c 7 libxpcom_core.dylib 0x2c00a374 NS_ProcessNextEvent_P(nsIThread*, int) + 0x4c 8 org.mozilla.sunbird 0x000c38d4 nsSocketTransportService::Run() + 0xf8 9 libxpcom_core.dylib 0x2c048f8c nsThread::ProcessNextEvent(int, int*) + 0x118 10 libxpcom_core.dylib 0x2c00a374 NS_ProcessNextEvent_P(nsIThread*, int) + 0x4c 11 libxpcom_core.dylib 0x2c0485d4 nsThread::ThreadFunc(void*) + 0x9c 12 libnspr4.dylib 0x2001cf7c PR_Select + 0x354 13 libSystem.B.dylib 0x90024990 _pthread_body + 0x28 Thread 2: 0 libSystem.B.dylib 0x90018e78 semaphore_timedwait_signal_trap + 0x8 1 libSystem.B.dylib 0x9000ea14 _pthread_cond_wait + 0x268 2 libnspr4.dylib 0x20017e54 PR_Unlock + 0x12c 3 libnspr4.dylib 0x200180b8 PR_WaitCondVar + 0x88 4 libxpcom_core.dylib 0x2c04c5b4 TimerThread::Run() + 0x1a8 5 libxpcom_core.dylib 0x2c048f8c nsThread::ProcessNextEvent(int, int*) + 0x118 6 libxpcom_core.dylib 0x2c00a374 NS_ProcessNextEvent_P(nsIThread*, int) + 0x4c 7 libxpcom_core.dylib 0x2c0485d4 nsThread::ThreadFunc(void*) + 0x9c 8 libnspr4.dylib 0x2001cf7c PR_Select + 0x354 9 libSystem.B.dylib 0x90024990 _pthread_body + 0x28 Thread 3: 0 libSystem.B.dylib 0x90018e78 semaphore_timedwait_signal_trap + 0x8 1 libSystem.B.dylib 0x9000ea14 _pthread_cond_wait + 0x268 2 libnspr4.dylib 0x20017e54 PR_Unlock + 0x12c 3 libnspr4.dylib 0x200180b8 PR_WaitCondVar + 0x88 4 libnspr4.dylib 0x20018420 PR_Wait + 0x30 5 libxpcom_core.dylib 0x2c04a618 nsThreadPool::Run() + 0x164 6 libxpcom_core.dylib 0x2c048f8c nsThread::ProcessNextEvent(int, int*) + 0x118 7 libxpcom_core.dylib 0x2c00a374 NS_ProcessNextEvent_P(nsIThread*, int) + 0x4c 8 libxpcom_core.dylib 0x2c0485d4 nsThread::ThreadFunc(void*) + 0x9c 9 libnspr4.dylib 0x2001cf7c PR_Select + 0x354 10 libSystem.B.dylib 0x90024990 _pthread_body + 0x28 PPC Thread State: srr0: 0x2c06c6a4 srr1: 0x0200f030 vrsave: 0x00000000 cr: 0x28042448 xer: 0x00000004 lr: 0x2c06c668 ctr: 0x2c06b7a4 r0: 0x2c0907e8 r1: 0xbfffda60 r2: 0x00000000 r3: 0x0097c5c0 r4: 0xbfffdb00 r5: 0x00000000 r6: 0x00000018 r7: 0x00000061 r8: 0x00000061 r9: 0x2c0907e8 r10: 0x2c06b770 r11: 0x0090c460 r12: 0x2c06b7a4 r13: 0x00910000 r14: 0x00000000 r15: 0x0192aa70 r16: 0xbfffdff0 r17: 0x00000000 r18: 0xbfffdf40 r19: 0x023784e8 r20: 0x00000000 r21: 0x00000001 r22: 0x2c08b9c4 r23: 0x2c091784 r24: 0x00000017 r25: 0xbfffdd10 r26: 0x047a7f90 r27: 0xbfffdbc0 r28: 0x00000018 r29: 0xbfffdb60 r30: 0xbfffdb00 r31: 0x2c06c668 Binary Images Description: 0x1000 - 0x8f6fff org.mozilla.sunbird 0.3.1 /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/sunbird-bin 0xe53000 - 0xe66fff libjsd.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/components/libjsd.dylib 0xeed000 - 0xf26fff libxpinstall.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/components/libxpinstall.dylib 0x18d4000 - 0x18d6fff com.apple.textencoding.unicode 1.6.4 /System/Library/TextEncodings/Unicode Encodings.bundle/Contents/MacOS/Unicode Encodings 0x20000000 - 0x20032fff libnspr4.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libnspr4.dylib 0x21000000 - 0x2100dfff libplds4.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libplds4.dylib 0x22000000 - 0x2200efff libplc4.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libplc4.dylib 0x23000000 - 0x23094fff libmozjs.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libmozjs.dylib 0x24000000 - 0x24000fff libxpcom.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libxpcom.dylib 0x25000000 - 0x25023fff libssl3.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libssl3.dylib 0x26000000 - 0x26061fff libnss3.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libnss3.dylib 0x27000000 - 0x2701dfff libsmime3.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libsmime3.dylib 0x28000000 - 0x2804bfff libsoftokn3.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libsoftokn3.dylib 0x2c000000 - 0x2c08afff libxpcom_core.dylib /Users/celtx/Desktop/Sunbird-0.3.1.app/Contents/MacOS/libxpcom_core.dylib 0x73230000 - 0x73233fff libmx.A.dylib /usr/lib/libmx.A.dylib 0x76c02000 - 0x76c12fff com.apple.Accelerate.vecLib 3.0.3 (vecLib 3.0.3) 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com.apple.audio.SoundManager 3.9 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/CarbonSound.framework/Versions/A/CarbonSound 0x91206000 - 0x91216fff com.apple.speech.recognition.framework 3.3 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SpeechRecognition.framework/Versions/A/SpeechRecognition 0x913a0000 - 0x9145ffff ColorSync /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ColorSync.framework/Versions/A/ColorSync 0x914ad000 - 0x91516fff com.apple.htmlrendering 1.1.2 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HTMLRendering.framework/Versions/A/HTMLRendering 0x91801000 - 0x91815fff libcups.2.dylib /usr/lib/libcups.2.dylib 0x9196c000 - 0x91974fff libbsm.dylib /usr/lib/libbsm.dylib 0x91990000 - 0x9199bfff com.apple.securityhi 1.2 (90) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/SecurityHI.framework/Versions/A/SecurityHI 0x919a3000 - 0x91a5cfff com.apple.QD 3.4.72 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/QD.framework/Versions/A/QD 0x91b10000 - 0x91b2afff libPDFRIP.A.dylib /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libPDFRIP.A.dylib 0x91b50000 - 0x91b5ffff libPSRIP.A.dylib /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libPSRIP.A.dylib 0x91b80000 - 0x91b93fff libRIP.A.dylib /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/Resources/libRIP.A.dylib 0x92070000 - 0x92096fff com.apple.FindByContent 1.4 (1.2) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/FindByContent.framework/Versions/A/FindByContent 0x920a9000 - 0x920e1fff com.apple.AE 1.4 /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/AE.framework/Versions/A/AE 0x920fc000 - 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0x96aa0000 - 0x96acefff libssl.0.9.7.dylib /usr/lib/libssl.0.9.7.dylib 0x96ade000 - 0x96aeefff com.apple.ImageCapture 2.1.5 /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/ImageCapture.framework/Versions/A/ImageCapture 0x96b50000 - 0x96bdffff ATS /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/ATS 0x96c00000 - 0x96c8cfff com.apple.ink.framework 101.1.4 (55.12) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/Ink.framework/Versions/A/Ink 0x96cb0000 - 0x96d9efff libiconv.2.dylib /usr/lib/libiconv.2.dylib 0x96e80000 - 0x96e90fff com.apple.vecLib 3.0.3 (vecLib 3.0.3) /System/Library/Frameworks/vecLib.framework/Versions/A/vecLib 0x97319000 - 0x975f1fff com.apple.CoreGraphics 1.203.30 (???) /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics 0x97be8000 - 0x97f6dfff com.apple.HIToolbox 1.3.7 (???) /System/Library/Frameworks/Carbon.framework/Versions/A/Frameworks/HIToolbox.framework/Versions/A/HIToolbox 0x980e4000 - 0x985e3fff com.apple.AppKit 6.3.11 (743.43) /System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
Version: unspecified → Sunbird 0.3.1
Is that the issue seen in Talkback Incident ID 29762643 ?
(In reply to comment #1) > Is that the issue seen in Talkback Incident ID 29762643 ? > It looks like the same stack trace, and it's the same description of crashing after launch, so I'd say it's the same issue.
Tony, does it also happens with the most recent Sunbird 0.5pre nightly builds from [http://ftp.mozilla.org/pub/mozilla.org/calendar/sunbird/nightly/latest-mozilla1.8/]?
Marking confirmed based on bug report and talkback crash report. The forum post at [http://forums.mozillazine.org/viewtopic.php?t=529006] might report the same issue. This probably should block 0.5 release if the crash also happens with current 0.5pre nightly builds.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Flags: blocking-calendar0.5?
Keywords: qawanted
Blocking 0.5 for now.
Flags: blocking-calendar0.5? → blocking-calendar0.5+
Tony, Could you try to replicate this using a currently nightly build (available at http://ftp.mozilla.org/pub/mozilla.org/calendar/sunbird/nightly/latest-mozilla1.8/ )? I think this may be a tinderbox config/Mac OS SDK issue. If possible, please also try to replicate using a currently trunk nightly (available at http://ftp.mozilla.org/pub/mozilla.org/calendar/sunbird/nightly/latest-trunk/ )
I've replicated it with the 1.8 and trunk nightlies. Same stack trace in each.
Thanks Tony. I should have access to a 10.3 box tonight, so I'll see if I can figure out what's going on.
I'm seeing it on 10.3.9 as well. Unfortunately my 10.3.9 box is a 233MHz G3 iMac, which I connect to remotely, with a speed not unlike a glacier, so there's no dev environment on it. I'm looking at the code, and asked dmose and ctalbert to look it over for glaring obvious mistakes, but we're not seeing one.
(In reply to comment #9) > I'm looking at the code, and asked dmose and ctalbert to look it over for > glaring obvious mistakes, but we're not seeing one. I couldn't see one either, but I've noticed it doesn't occur on 10.3 if you build as shared instead of static. Some sort of linking voodoo?
There is quite a bunch of weird string stuff going on if you ask me. 1427 if (!StringBeginsWith( 1428 tzid, nsDependentCString(STRLEN_ARGS("/mozilla.org/")))) { Why not NS_LITERAL_CSTRING("/mozilla.org/")? 1441 nsCAutoString continent(Substring(tzid, prefixEnd + 1, 1442 continentEnd - (prefixEnd + 1))); Why is that a nsCAutoString and not an nsDependentCSubstring? (but those likely don't have anything to do with the crash) What worries me much more is the use of nsACString_internal. That name alone screams that it is not to be used by external code. And yet, we do it. Why? Looking at the place of the crash, it might have something to do with creating a substring inside the equals call. What you you take the substring creation out of the equals call, and make it a variable of it's own? (I'm just shouting ideas here, I have no way to test any of this, due to the lack of 10.3.9. Can anybody that does have access to that, and has can compile sunbird on it, experiment with those ideas?)
Whiteboard: [needs patch] [no l10n impact]
how about writing a testcase? i have 10.3.9 (and nothing newer) PPC, so I'll gladly build things on those rare nights I'm awake at home for the 5mins it takes.... I don't have space to build sunbird, my mac keeps telling me that my startup disk is running out of space (and I don't have a non startup disk...).
Assignee: nobody → lilmatt
Matt, now that you have a working 10.3 box, do you have any news on this?
Attached patch code massage — — Splinter Review
The stack indicates a crash when evaluating the right side of line 1476's != (Equals) expression. I suspect that the compiler has problems with temporary objects in this context (resulting out of the SubString() function). As a first shot to try, I would like to avoid temporaries, i.e. spend explicit variables and see if this solves the problem.
Attachment #263588 - Flags: review?(lilmatt)
Tony (or anyone else), could you try to build lightning using Daniels patch?
Sure thing. I'll do a Sunbird and a Lightning, and let you know how it works on a 10.3 box.
(In reply to comment #16) > Sure thing. I'll do a Sunbird and a Lightning, and let you know how it works on > a 10.3 box. > Hi Tony, hate to pressure you, but I am contemplating checking this fix in later today (May 9). Do you have an update? Thanks, Clint
Lightning works, but Sunbird still crashes with the same error. I'm trying a clean rebuild of Sunbird to confirm.
Still crashing using that patch, but I found something that works: I replaced gTzIdPrefix with a local constant and it no longer crashes.
This replaces gTzIdPrefix with a const char[] and creates an nsCAutoString at run-time for calICSService::LatestTzId(). I've confirmed that this runs on 10.3 and 10.4.
Attachment #264373 - Flags: review?(lilmatt)
Comment on attachment 264373 [details] [diff] [review] Patch to maketzdata.pl, tzdata.c, and calICSService.cpp taking over review since AFAIK lilmatt is travelling >+static const char kTzIdPrefix[] = "${TZ_PREFIX}/"; make it non-static r=dbo
Attachment #264373 - Flags: review?(lilmatt) → review+
Summary: Sunbird crashes on open in Mac OS 10.3, works in Mac OS 10.4 → Sunbird crashes on open in Mac OS 10.3, works in Mac OS 10.4 [@ nsACString_internal::GetReadableBuffer()]
Just for the notes: After knowing the fix this seems to be the same issue Firefox had some years ago: Bug 234916.
Keywords: qawanted → crash
Whiteboard: [needs patch] [no l10n impact] → [no l10n impact]
checked in on trunk and branch
Status: NEW → RESOLVED
Closed: 18 years ago
Resolution: --- → FIXED
Attachment #263588 - Flags: review?(lilmatt)
Marking VERIFIED because the reporter himself provided the patch for the bug. :)
Status: RESOLVED → VERIFIED
Flags: blocking-calendar0.5+
Whiteboard: [no l10n impact]
Crash Signature: [@ nsACString_internal::GetReadableBuffer()]
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