debugging crashes in dyld?
debugging crashes in dyld?
- Subject: debugging crashes in dyld?
- From: Martin Wierschin <email@hidden>
- Date: Tue, 27 Sep 2011 14:06:12 -0700
Hello everyone,
I have a user reporting a crash whenever they try to first save a file. It is reproducible for the user (though not be me) and I'm wondering how to best debug this problem remotely. I've included the crash stack below (all other threads are waiting/trapped).
I'm no expert on dyld, but I suspect the crash is triggered when loading up some bundle code required by OSX's save panel (or perhaps some kind of installed system enhancer). I've discovered the environment variable DYLD_PRINT_LIBRARIES_POST_LAUNCH, which I'm hoping will help identify the relevant library. However, my fear is that this debugging aid logs each library's path only after each load completes successfully (ie: conceptually after the crash). If so, that obviously won't help me.
Thanks for any advice,
~Martin
> OS Version: Mac OS X 10.6.8 (10K540)
...
> Exception Type: EXC_BAD_ACCESS (SIGBUS)
> Exception Codes: KERN_PROTECTION_FAILURE at 0x000000000000000c
> Crashed Thread: 0 Dispatch queue: com.apple.main-thread
>
> Thread 0 Crashed: Dispatch queue: com.apple.main-thread
> 0 libobjc.A.dylib 0x942ce85b _cache_flush + 78
> 1 libobjc.A.dylib 0x942d17a5 flush_marked_caches + 242
> 2 libobjc.A.dylib 0x942cb18d _read_images + 2189
> 3 libobjc.A.dylib 0x942e0975 map_images_nolock + 1545
> 4 libobjc.A.dylib 0x942ca189 map_images + 72
> 5 dyld 0x8fe03f2d dyld::notifyBatchPartial(dyld_image_states, bool, char const* (*)(dyld_image_states, unsigned int, dyld_image_info const*)) + 795
> 6 dyld 0x8fe0dec9 ImageLoader::link(ImageLoader::LinkContext const&, bool, bool, ImageLoader::RPathChain const&) + 251
> 7 dyld 0x8fe056af dyld::link(ImageLoader*, bool, ImageLoader::RPathChain const&) + 137
> 8 dyld 0x8fe0b240 dlopen + 471
> 9 libSystem.B.dylib 0x936e02a8 dlopen + 66
> 10 com.apple.HIToolbox 0x9489d1c2 InitShortcut + 45
> 11 com.apple.HIToolbox 0x9489d0d1 SetupMenuTracking(MenuSelectData&, unsigned char, Point, double, MenuData*, unsigned long, unsigned short, Rect const*, Rect const*, unsigned int, Rect const*, __CFString const*) + 2964
> 12 com.apple.HIToolbox 0x9489c07d MenuSelectCore(MenuData*, Point, double, unsigned long, OpaqueMenuRef**, unsigned short*) + 227
> 13 com.apple.HIToolbox 0x9489b8bb _HandleMenuSelection2 + 465
> 14 com.apple.HIToolbox 0x9489b6d9 _HandleMenuSelection + 53
> 15 com.apple.AppKit 0x9136ff96 _NSHandleCarbonMenuEvent + 285
> 16 com.apple.AppKit 0x91344b46 _DPSNextEvent + 2304
> 17 com.apple.AppKit 0x91343dd6 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 156
> 18 com.apple.AppKit 0x913061f3 -[NSApplication run] + 821
> 19 com.apple.AppKit 0x912fe289 NSApplicationMain + 574
> 20 com.myAppIdentifier 0x0000330a _start + 216
> 21 com.myAppIdentifier 0x00003231 start + 41
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