I'm experiencing an intermittent crash with my multi-threaded monobjc
application on OSX 10.6 Snow Leopard. There doesn't seem to be any
reliable sequence of user interaction that triggers this crash, but
the crash dumps all show a similar pattern: EXC_CRASH in thread 0
while another thread is executing a managed garbage collection after a
String.Split(). Example follows. I'm not sure what an appropriate fix
or workaround to this problem is. Any help is greatly appreciated.


Exception Type: EXC_CRASH (SIGILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Thread 0 Crashed: Dispatch queue: com.apple.main-thread
0 libSystem.B.dylib 0x92b6d2fa mach_msg_trap + 10
1 libSystem.B.dylib 0x92b6da67 mach_msg + 68
2 com.apple.CoreFoundation 0x9945d00f __CFRunLoopRun + 2079
3 com.apple.CoreFoundation 0x9945c0f4 CFRunLoopRunSpecific + 452
4 com.apple.CoreFoundation 0x9945bf21 CFRunLoopRunInMode + 97
5 com.apple.HIToolbox 0x97ada0fc RunCurrentEventLoopInMode +
392
6 com.apple.HIToolbox 0x97ad9eb1 ReceiveNextEventCommon +
354
7 com.apple.HIToolbox 0x97ad9d36
BlockUntilNextEventMatchingListInMode + 81
8 com.apple.AppKit 0x97e12135 _DPSNextEvent + 847
9 com.apple.AppKit 0x97e11976 -[NSApplication
nextEventMatchingMask:untilDate:inMode:dequeue:] + 156
10 com.apple.AppKit 0x97dd3bef -[NSApplication run] + 821
11 ??? 0x14b5cdda 0 + 347459034
12 ??? 0x14b5cd04 0 + 347458820
13 ??? 0x14b5cc96 0 + 347458710
14 ??? 0x14b5cc76 0 + 347458678
15 ??? 0x020bc1f2 0 + 34324978

[...]

Thread 13:
0 libmono.0.dylib 0x018a9ae4 GC_clear_stack_inner + 22
(misc.c:295)
1 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
2 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
3 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
4 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
5 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
6 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
7 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
8 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
9 libmono.0.dylib 0x018a9b15 GC_clear_stack_inner + 71
(misc.c:301)
10 libmono.0.dylib 0x018a9bc1 GC_clear_stack + 153
(misc.c:343)
11 libmono.0.dylib 0x018a5484 GC_malloc_atomic + 150
(malloc.c:262)
12 libmono.0.dylib 0x018114dd
mono_object_allocate_ptrfree + 46 (object.c:3824)
13 libmono.0.dylib 0x018117fb mono_string_new_size + 146
(object.c:4395)
14 libmono.0.dylib 0x018407b5
ves_icall_System_String_InternalSplit + 921 (string-icalls.c:145)
15 ??? 0x164849b6 0 + 373836214
[...]

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