Our (legacy) app runs stable on a range of OS versions (10.4 - 10.7) since years and now randomly crashes at ONE customers computers (both of them, though) within WaitNextEvent.
All crashes occur deep inside Apple's code with random locations but always with WaitNextEvent somewhere in the call stack.
Examples are:
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 dyld 0x8fe8a33d _ZN4dyldL10loadPhase5EPKcS1_RKNS_11LoadContextEPSt6vectorIS1_SaIS1_EE + 716
1 dyld 0x8fe8a501 _ZN4dyldL10loadPhase4EPKcS1_RKNS_11LoadContextEPSt6vectorIS1_SaIS1_EE + 179
2 dyld 0x8fe8ae31 _ZN4dyldL10loadPhase3EPKcS1_RKNS_11LoadContextEPSt6vectorIS1_SaIS1_EE + 1429
3 dyld 0x8fe8b1f1 _ZN4dyldL10loadPhase1EPKcS1_RKNS_11LoadContextEPSt6vectorIS1_SaIS1_EE + 166
4 dyld 0x8fe8b340 _ZN4dyldL10loadPhase0EPKcS1_RKNS_11LoadContextEPSt6vectorIS1_SaIS1_EE + 240
5 dyld 0x8fe8b3fd dyld::load(char const*, dyld::LoadContext const&) + 132
6 dyld 0x8fe8e036 dlopen + 428
7 libdyld.dylib 0x977b9a95 dlopen + 70
8 com.apple.CoreServices.CarbonCore 0x90d467cf GetDYLDEntryPointWithImage + 43
9 com.apple.CoreServices.CarbonCore 0x90d50aed GetDYLDEntryPoint + 45
10 com.apple.AppKit 0x9c62cf2c _IsCarbonFullScreenInstanceWorkspace + 57
11 com.apple.AppKit 0x9c03231c -[NSApplication _updateFullScreenPresentationOptions] + 75
12 com.apple.AppKit 0x9bdc97d5 -[NSApplication sendEvent:] + 906
13 com.apple.AppKit 0x9c4d81e1 _appActivationHandler + 547
14 com.apple.AppKit 0x9c4d79b8 carbonAppApplicationHandler + 108
15 com.apple.HIToolbox 0x9bb9f920 _InvokeEventHandlerUPP(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*, long (*)(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*)) + 36
16 com.apple.HIToolbox 0x9ba1b803 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1602
17 com.apple.HIToolbox 0x9ba1ac80 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 482
18 com.apple.HIToolbox 0x9ba1aa98 SendEventToEventTargetWithOptions + 75
19 com.apple.HIToolbox 0x9ba306fe _ZL29ToolboxEventDispatcherHandlerP25OpaqueEventHandlerCallRefP14OpaqueEventRefPv + 3152
20 com.apple.HIToolbox 0x9ba1bcbe _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 2813
21 com.apple.HIToolbox 0x9ba1ac80 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 482
22 com.apple.HIToolbox 0x9ba2faa9 SendEventToEventTarget + 76
23 com.apple.HIToolbox 0x9bb9f76c ToolboxEventDispatcher + 82
24 com.apple.HIToolbox 0x9bbb1e0f GetOrPeekEvent + 482
25 com.apple.HIToolbox 0x9bbb217f GetNextEventMatchingMask + 539
26 com.apple.HIToolbox 0x9bbb24b7 WNEInternal + 434
27 com.apple.HIToolbox 0x9bbb1784 WaitNextEvent + 53
28 com.ourStuff 0x000bebe5 LApplication::ProcessNextEvent() + 69
or
Thread 0:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x9c2dec22 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x9c2de1f6 mach_msg + 70
2 com.apple.CoreFoundation 0x98f370ea __CFRunLoopServiceMachPort + 170
3 com.apple.CoreFoundation 0x98f40214 __CFRunLoopRun + 1428
4 com.apple.CoreFoundation 0x98f3f8ec CFRunLoopRunSpecific + 332
5 com.apple.CoreFoundation 0x98f3f798 CFRunLoopRunInMode + 120
6 com.apple.HIToolbox 0x95b7fa7f RunCurrentEventLoopInMode + 318
7 com.apple.HIToolbox 0x95d1c151 GetNextEventMatchingMask + 493
8 com.apple.HIToolbox 0x95d1c4b7 WNEInternal + 434
9 com.apple.HIToolbox 0x95d1b784 WaitNextEvent + 53
10 com.apple.HIToolbox 0x95cfc136 ModalDialog + 1638
11 com.apple.HIToolbox 0x95d03ff5 RunStandardAlert + 741
12 com.apple.HIToolbox 0x95d028bf StandardAlert + 201
13 com.ourStuff 0x0007fbaa 0x1000 + 519082
Any hints are highly appreciated!
As of now we couldn't reproduce the bug locally.
FWIW - the crashes just disappeared after that particular customer deactivated DefaultFolderX (which kept showing up in every crash dump of our app on the customers system)..