Bug 30816 - Random Hard Crash on 64-bit devices
Summary: Random Hard Crash on 64-bit devices
Status: RESOLVED NORESPONSE
Alias: None
Product: iOS
Classification: Xamarin
Component: XI runtime ()
Version: XI 8.10
Hardware: PC Windows
: Normal normal
Target Milestone: Untriaged
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2015-06-04 15:04 UTC by Michael Stonis
Modified: 2016-06-09 00:25 UTC (History)
5 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
RESOLVED NORESPONSE

Description Michael Stonis 2015-06-04 15:04:47 UTC
Our client has an application that will infrequently crash on 64-bit devices. The crash happens when a new ViewController is being pushed to a screen. This navigation is being driven by a storyboard. This same crash scenario has happened on a few screens in the application.

The only consistency that we have seen is from the following two lines

4   libsystem_malloc.dylib        	0x0000000196fb52f4 nano_free + 188
5   CoreFoundation                	0x0000000184e95670 CFRelease + 1060

Each of these crashes comes after a CFRelease and nano_free.

The application has been in production for a few years and did not exhibit this behavior before unified and still does not exhibit this behavior on 32-bit systems.

When this crash occurs, there is no log in Xamarin.Insights and it does not bubble up an exception through the stack.

------------------------------
Crash Log from device
------------------------------

Incident Identifier: 3721EEF5-C584-4CFE-8C30-B333099B4933
CrashReporter Key:   70ae5e026d9ab920b7940657f2a24011a99764ff
Hardware Model:      iPhone7,1
Process:             ArtsoniaiOS [9195]
Path:                /private/var/mobile/Containers/Bundle/Application/7126719B-B9BC-4C3F-84EC-BD327A31C47C/ArtsoniaiOS.app/ArtsoniaiOS
Identifier:          com.artsonia.beta
Version:             4101 (4.1.1)
Code Type:           ARM-64 (Native)
Parent Process:      launchd [1]

Date/Time:           2015-05-29 17:10:58.489 -0500
Launch Time:         2015-05-29 16:44:09.875 -0500
OS Version:          iOS 8.3 (12F70)
Report Version:      105

Exception Type:  EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Triggered by Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_kernel.dylib        	0x0000000196f7b270 __pthread_kill + 8
1   libsystem_pthread.dylib       	0x000000019701916c pthread_kill + 108
2   libsystem_c.dylib             	0x0000000196ef2b14 abort + 108
3   libsystem_malloc.dylib        	0x0000000196fb63e0 nanozone_error + 316
4   libsystem_malloc.dylib        	0x0000000196fb52f4 nano_free + 188
5   CoreFoundation                	0x0000000184e95670 CFRelease + 1060
6   UIFoundation                  	0x0000000192d8537c -[NSATSTypesetter endParagraph] + 176
7   UIFoundation                  	0x0000000192d85b18 -[NSATSTypesetter layoutParagraphAtPoint:] + 740
8   UIFoundation                  	0x0000000192ddcab0 -[NSTypesetter _layoutGlyphsInLayoutManager:startingAtGlyphIndex:maxNumberOfLineFragments:maxCharacterIndex:nextGlyphIndex:nextCharacterIndex:] + 3156
9   UIFoundation                  	0x0000000192ddd818 -[NSTypesetter layoutCharactersInRange:forLayoutManager:maximumNumberOfLineFragments:] + 264
10  UIFoundation                  	0x0000000192d863e4 -[NSATSTypesetter layoutCharactersInRange:forLayoutManager:maximumNumberOfLineFragments:] + 688
11  UIFoundation                  	0x0000000192d72740 -[NSLayoutManager(NSPrivate) _fillLayoutHoleForCharacterRange:desiredNumberOfLines:isSoft:] + 1272
12  UIFoundation                  	0x0000000192d78ff8 _NSFastFillAllLayoutHolesForGlyphRange + 1560
13  UIFoundation                  	0x0000000192d76f58 -[NSLayoutManager(NSPrivate) _rectArrayForRange:withinSelectionRange:rangeIsCharRange:singleRectOnly:fullLineRectsOnly:inTextContainer:rectCount:rangeWithinContainer:glyphsDrawOutsideLines:rectArray:rectArrayCapacity:] + 860
14  UIFoundation                  	0x0000000192d79944 -[NSLayoutManager(NSPrivate) _rectArrayForRange:withinSelectionRange:rangeIsCharRange:singleRectOnly:fullLineRectsOnly:inTextContainer:rectCount:rangeWithinContainer:glyphsDrawOutsideLines:] + 52
15  UIFoundation                  	0x0000000192dae3f4 -[NSLayoutManager rectArrayForCharacterRange:withinSelectedCharacterRange:inTextContainer:rectCount:] + 48
16  UIKit                         	0x0000000189aa244c -[_UITextContainerView updateInsertionPointStateAndRestartTimer:] + 252
17  UIFoundation                  	0x0000000192d7d940 -[NSLayoutManager(NSPrivate) _invalidateLayoutForExtendedCharacterRange:isSoft:invalidateUsage:] + 2240
18  UIFoundation                  	0x0000000192da9e88 -[NSLayoutManager textStorage:edited:range:changeInLength:invalidatedRange:] + 260
19  UIFoundation                  	0x0000000192daa1a8 -[NSLayoutManager processEditingForTextStorage:edited:range:changeInLength:invalidatedRange:] + 32
20  UIFoundation                  	0x0000000192dcf15c -[NSTextStorage _notifyEdited:range:changeInLength:invalidatedRange:] + 168
21  UIFoundation                  	0x0000000192dce7d0 -[NSTextStorage endEditing] + 96
22  UIKit                         	0x0000000189aa4978 -[UITextView setAttributedText:] + 240
23  UIKit                         	0x000000018a12cf44 -[UITextView initWithCoder:] + 688
24  UIKit                         	0x0000000189ee36b4 UINibDecoderDecodeObjectForValue + 808
25  UIKit                         	0x0000000189ee3654 UINibDecoderDecodeObjectForValue + 712
26  UIKit                         	0x0000000189ee3370 -[UINibDecoder decodeObjectForKey:] + 340
27  UIKit                         	0x0000000189cc0dac -[UIView initWithCoder:] + 624
28  UIKit                         	0x0000000189cd28ac -[UIScrollView initWithCoder:] + 68
29  UIKit                         	0x0000000189ee36b4 UINibDecoderDecodeObjectForValue + 808
30  UIKit                         	0x0000000189ee3370 -[UINibDecoder decodeObjectForKey:] + 340
31  UIKit                         	0x0000000189e19144 -[UIRuntimeConnection initWithCoder:] + 164
32  UIKit                         	0x0000000189ee36b4 UINibDecoderDecodeObjectForValue + 808
33  UIKit                         	0x0000000189ee3654 UINibDecoderDecodeObjectForValue + 712
34  UIKit                         	0x0000000189ee3370 -[UINibDecoder decodeObjectForKey:] + 340
35  UIKit                         	0x0000000189e185a4 -[UINib instantiateWithOwner:options:] + 1096
36  UIKit                         	0x0000000189d14380 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
37  UIKit                         	0x00000001899f8a24 -[UIViewController loadViewIfRequired] + 84
38  UIKit                         	0x00000001899f8990 -[UIViewController view] + 28
39  UIKit                         	0x0000000189b9b258 -[UINavigationController _startCustomTransition:] + 708
40  UIKit                         	0x0000000189aadeec -[UINavigationController _startDeferredTransitionIfNeeded:] + 464
41  UIKit                         	0x0000000189aadcb8 -[UINavigationController __viewWillLayoutSubviews] + 52
42  UIKit                         	0x0000000189aadc38 -[UILayoutContainerView layoutSubviews] + 196
43  UIKit                         	0x00000001899f575c -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 576
44  QuartzCore                    	0x000000018933de18 -[CALayer layoutSublayers] + 148
45  QuartzCore                    	0x0000000189338880 CA::Layer::layout_if_needed(CA::Transaction*) + 316
46  QuartzCore                    	0x0000000189338724 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 28
47  QuartzCore                    	0x0000000189337eb8 CA::Context::commit_transaction(CA::Transaction*) + 272
48  QuartzCore                    	0x0000000189337c38 CA::Transaction::commit() + 524
49  QuartzCore                    	0x0000000189331360 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 76
50  CoreFoundation                	0x0000000184f702a0 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
51  CoreFoundation                	0x0000000184f6d22c __CFRunLoopDoObservers + 356
52  CoreFoundation                	0x0000000184f6d60c __CFRunLoopRun + 832
53  CoreFoundation                	0x0000000184e992d0 CFRunLoopRunSpecific + 392
54  GraphicsServices              	0x000000018e6af6f8 GSEventRunModal + 164
55  UIKit                         	0x0000000189a5efa8 UIApplicationMain + 1484
56  ArtsoniaiOS                   	0x0000000100204878 0x100000000 + 2115704
57  ArtsoniaiOS                   	0x000000010018b468 0x100000000 + 1619048
58  ArtsoniaiOS                   	0x000000010018b428 0x100000000 + 1618984
59  ArtsoniaiOS                   	0x000000010005b570 0x100000000 + 374128
60  ArtsoniaiOS                   	0x000000010042bf90 0x100000000 + 4374416
61  ArtsoniaiOS                   	0x000000010121eb7c 0x100000000 + 19000188
62  ArtsoniaiOS                   	0x0000000101281f84 0x100000000 + 19406724
63  ArtsoniaiOS                   	0x0000000101286720 0x100000000 + 19425056
64  ArtsoniaiOS                   	0x0000000101302148 0x100000000 + 19931464
65  ArtsoniaiOS                   	0x00000001011cc718 0x100000000 + 18663192
66  libdyld.dylib                 	0x0000000196e62a04 start + 0

Thread 1 name:  Dispatch queue: com.apple.libdispatch-manager
Thread 1:
0   libsystem_kernel.dylib        	0x0000000196f60c24 kevent64 + 8
1   libdispatch.dylib             	0x0000000196e45e6c _dispatch_mgr_invoke + 272
2   libdispatch.dylib             	0x0000000196e37998 _dispatch_mgr_thread + 48

Thread 2:
0   libsystem_kernel.dylib        	0x0000000196f60e48 semaphore_wait_trap + 8
1   ArtsoniaiOS                   	0x00000001012eeec4 0x100000000 + 19852996
2   ArtsoniaiOS                   	0x000000010124c820 0x100000000 + 19187744
3   ArtsoniaiOS                   	0x00000001012cf0b4 0x100000000 + 19722420
4   ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
5   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
6   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
7   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 3:
0   libsystem_kernel.dylib        	0x0000000196f7b570 __semwait_signal + 8
1   libsystem_c.dylib             	0x0000000196e9d92c nanosleep + 212
2   ArtsoniaiOS                   	0x00000001012e2794 0x100000000 + 19802004
3   ArtsoniaiOS                   	0x00000001012c8170 0x100000000 + 19693936
4   ArtsoniaiOS                   	0x00000001012cf0b4 0x100000000 + 19722420
5   ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
6   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
7   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
8   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 4:
0   libsystem_kernel.dylib        	0x0000000196f7b078 __psynch_cvwait + 8
1   libsystem_pthread.dylib       	0x0000000197016f28 _pthread_cond_wait + 620
2   ArtsoniaiOS                   	0x00000001012d39e4 0x100000000 + 19741156
3   ArtsoniaiOS                   	0x00000001012e0e64 0x100000000 + 19795556
4   ArtsoniaiOS                   	0x00000001012ca904 0x100000000 + 19704068
5   ArtsoniaiOS                   	0x000000010036c1ac 0x100000000 + 3588524
6   ArtsoniaiOS                   	0x000000010036c3e8 0x100000000 + 3589096
7   ArtsoniaiOS                   	0x000000010036c478 0x100000000 + 3589240
8   ArtsoniaiOS                   	0x000000010036b874 0x100000000 + 3586164
9   ArtsoniaiOS                   	0x0000000100368f70 0x100000000 + 3575664
10  ArtsoniaiOS                   	0x000000010042bf90 0x100000000 + 4374416
11  ArtsoniaiOS                   	0x000000010121eb7c 0x100000000 + 19000188
12  ArtsoniaiOS                   	0x0000000101281f84 0x100000000 + 19406724
13  ArtsoniaiOS                   	0x00000001012cf120 0x100000000 + 19722528
14  ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
15  libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
16  libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
17  libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 5:
0   libsystem_kernel.dylib        	0x0000000196f60e60 semaphore_timedwait_trap + 8
1   ArtsoniaiOS                   	0x00000001012eee44 0x100000000 + 19852868
2   ArtsoniaiOS                   	0x00000001012c6858 0x100000000 + 19687512
3   ArtsoniaiOS                   	0x00000001012cf0b4 0x100000000 + 19722420
4   ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
5   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
6   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
7   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 6:
0   libsystem_kernel.dylib        	0x0000000196f7b498 __select + 8
1   ArtsoniaiOS                   	0x00000001012ede74 0x100000000 + 19848820
2   ArtsoniaiOS                   	0x00000001012cf3fc 0x100000000 + 19723260
3   ArtsoniaiOS                   	0x00000001012cf0b4 0x100000000 + 19722420
4   ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
5   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
6   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
7   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 7:
0   libsystem_kernel.dylib        	0x0000000196f60e60 semaphore_timedwait_trap + 8
1   ArtsoniaiOS                   	0x00000001012eee44 0x100000000 + 19852868
2   ArtsoniaiOS                   	0x00000001012c6858 0x100000000 + 19687512
3   ArtsoniaiOS                   	0x00000001012cf0b4 0x100000000 + 19722420
4   ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
5   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
6   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
7   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 8 name:  com.apple.NSURLConnectionLoader
Thread 8:
0   libsystem_kernel.dylib        	0x0000000196f60e0c mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x0000000196f60c84 mach_msg + 68
2   CoreFoundation                	0x0000000184f6f720 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                	0x0000000184f6d674 __CFRunLoopRun + 936
4   CoreFoundation                	0x0000000184e992d0 CFRunLoopRunSpecific + 392
5   CFNetwork                     	0x000000018497a890 +[NSURLConnection(Loader) _resourceLoadLoop:] + 436
6   Foundation                    	0x0000000185eb9db4 __NSThread__main__ + 1068
7   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
8   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
9   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 9 name:  com.apple.CFSocket.private
Thread 9:
0   libsystem_kernel.dylib        	0x0000000196f7b498 __select + 8
1   CoreFoundation                	0x0000000184f75124 __CFSocketManager + 668
2   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
3   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
4   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 10:
0   libsystem_kernel.dylib        	0x0000000196f60e60 semaphore_timedwait_trap + 8
1   ArtsoniaiOS                   	0x00000001012eee44 0x100000000 + 19852868
2   ArtsoniaiOS                   	0x00000001012c6858 0x100000000 + 19687512
3   ArtsoniaiOS                   	0x00000001012cf0b4 0x100000000 + 19722420
4   ArtsoniaiOS                   	0x00000001012ef854 0x100000000 + 19855444
5   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
6   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
7   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 11:
0   libsystem_kernel.dylib        	0x0000000196f60e0c mach_msg_trap + 8
1   libsystem_kernel.dylib        	0x0000000196f60c84 mach_msg + 68
2   CoreFoundation                	0x0000000184f6f720 __CFRunLoopServiceMachPort + 196
3   CoreFoundation                	0x0000000184f6d674 __CFRunLoopRun + 936
4   CoreFoundation                	0x0000000184e992d0 CFRunLoopRunSpecific + 392
5   CoreFoundation                	0x0000000184eeb358 CFRunLoopRun + 108
6   CoreMotion                    	0x00000001858a4364 0x18585c000 + 295780
7   libsystem_pthread.dylib       	0x0000000197017dc4 _pthread_body + 160
8   libsystem_pthread.dylib       	0x0000000197017d20 _pthread_start + 156
9   libsystem_pthread.dylib       	0x0000000197014ef4 thread_start + 0

Thread 12:
0   libsystem_kernel.dylib        	0x0000000196f7bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib       	0x00000001970152d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib       	0x0000000197014eec start_wqthread + 0

Thread 13:
0   libsystem_kernel.dylib        	0x0000000196f7bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib       	0x00000001970152d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib       	0x0000000197014eec start_wqthread + 0

Thread 14:
0   libsystem_kernel.dylib        	0x0000000196f7bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib       	0x00000001970152d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib       	0x0000000197014eec start_wqthread + 0

Thread 15:
0   libsystem_kernel.dylib        	0x0000000196f7bc78 __workq_kernreturn + 8
1   libsystem_pthread.dylib       	0x00000001970152d8 _pthread_wqthread + 988
2   libsystem_pthread.dylib       	0x0000000197014eec start_wqthread + 0

Thread 0 crashed with ARM Thread State (64-bit):
    x0: 0x0000000000000000   x1: 0x0000000000000000   x2: 0x0000000000000000   x3: 0x0000000000000000
    x4: 0x0000000000000000   x5: 0x0000000000000000   x6: 0x0000000000000001   x7: 0x000000016fdf9e08
    x8: 0x0000000008000000   x9: 0x0000000004000000  x10: 0x0000000000000000  x11: 0x0000000000000000
   x12: 0x0000000000000034  x13: 0x000001a59a5f9959  x14: 0x0000000000000006  x15: 0x0000000000000100
   x16: 0x0000000000000148  x17: 0x0000000192ddaa9c  x18: 0x0000000000000000  x19: 0x0000000000000006
   x20: 0x000000019ae54310  x21: 0x0000000000000001  x22: 0x0000000196fbd036  x23: 0x0000000178602e20
   x24: 0x0000000000000000  x25: 0x0000000197481f50  x26: 0x0000000000000001  x27: 0xffffffff00000000
   x28: 0x0000000000000000  fp: 0x000000016fdfa780   lr: 0x0000000197019170
    sp: 0x000000016fdfa760   pc: 0x0000000196f7b270 cpsr: 0x00000000

Binary Images:
0x100000000 - 0x101a37fff ArtsoniaiOS arm64  <324053d3225c363989d1848eb40e1983> /var/mobile/Containers/Bundle/Application/7126719B-B9BC-4C3F-84EC-BD327A31C47C/ArtsoniaiOS.app/ArtsoniaiOS
0x1200bc000 - 0x1200e3fff dyld arm64  <75c68bbe28b13fcd91014f15139742dc> /usr/lib/dyld
0x183514000 - 0x183531fff libJapaneseConverter.dylib arm64  <b2c816981d683b2d92774b123ec43aa7> /System/Library/CoreServices/Encodings/libJapaneseConverter.dylib
0x1836ac000 - 0x183749fff AGXGLDriver arm64  <e853a6d23bc33b6891e845f0794ddfce> /System/Library/Extensions/AGXGLDriver.bundle/AGXGLDriver
0x183764000 - 0x1838f8fff AVFoundation arm64  <c69cb19d6db0339bbfb4c18fa7f4f26c> /System/Library/Frameworks/AVFoundation.framework/AVFoundation
0x1838fc000 - 0x183960fff libAVFAudio.dylib arm64  <fdd31b28c0ec3f76b8f0fa9a057e43d9> /System/Library/Frameworks/AVFoundation.framework/libAVFAudio.dylib
0x1839a4000 - 0x1839a4fff Accelerate arm64  <a2161063fee1315193bc488d0354f43e> /System/Library/Frameworks/Accelerate.framework/Accelerate
0x1839a8000 - 0x1839bafff libCGInterfaces.dylib arm64  <6dc1d203e31b34698c3b0c3c396dc2d4> /System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/Libraries/libCGInterfaces.dylib
0x1839bc000 - 0x183bdbfff vImage arm64  <74eb7b77dbcd321db86e784be9353a08> /System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/vImage
0x183bdc000 - 0x183c83fff libBLAS.dylib arm64  <56e8b79c2c03379dad45fe2ea1a4052f> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib
0x183c84000 - 0x183ffefff libLAPACK.dylib arm64  <fd491ae19b12315babb621650a0eef76> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLAPACK.dylib
0x184000000 - 0x184015fff libLinearAlgebra.dylib arm64  <9307063a5e1833abbb857a9ec4c5369e> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLinearAlgebra.dylib
0x184018000 - 0x184080fff libvDSP.dylib arm64  <d4d2b4a941213e2b81f3ddafd6b8a312> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libvDSP.dylib
0x184084000 - 0x1840a7fff libvMisc.dylib arm64  <92a0dd635be43dfe8c128c888ef37c0e> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libvMisc.dylib
0x1840a8000 - 0x1840a8fff vecLib arm64  <9248f57f1d8430219a810aa93254f157> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib
0x1840ac000 - 0x1840dbfff Accounts arm64  <4199851056d4376aa4d8668b83c85454> /System/Library/Frameworks/Accounts.framework/Accounts
0x1840e0000 - 0x18415efff AddressBook arm64  <73735c2a294139e5b99ada613fc861ea> /System/Library/Frameworks/AddressBook.framework/AddressBook
0x1842b4000 - 0x1842c8fff AssetsLibrary arm64  <06c85b7fcfaf3722b6e7a89a1ed5559e> /System/Library/Frameworks/AssetsLibrary.framework/AssetsLibrary
0x18447c000 - 0x18473cfff AudioToolbox arm64  <760c2dc59fa13660a769cc1b052d41e6> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox
0x1848dc000 - 0x184aeffff CFNetwork arm64  <df5535d1633f375aa889f755db0a93b9> /System/Library/Frameworks/CFNetwork.framework/CFNetwork
0x184b90000 - 0x184bf5fff CoreAudio arm64  <b85ca2cdb29639ccb5f6405baf597027> /System/Library/Frameworks/CoreAudio.framework/CoreAudio
0x184c1c000 - 0x184c3dfff CoreBluetooth arm64  <fbd7cbc4b2533ea38844bf98757ce58d> /System/Library/Frameworks/CoreBluetooth.framework/CoreBluetooth
0x184c40000 - 0x184e8cfff CoreData arm64  <af13d4e830e13607b745fe57f90e5d5e> /System/Library/Frameworks/CoreData.framework/CoreData
0x184e90000 - 0x1851eefff CoreFoundation arm64  <6548b13bef1f3f958d96266f7c4c44e0> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x1851f0000 - 0x185352fff CoreGraphics arm64  <92162d42d08d357ab66302a38d724828> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics
0x1853a8000 - 0x1853aafff libCGXType.A.dylib arm64  <8f40b7d9b97b344f9c7a5a0b79bdc2b7> /System/Library/Frameworks/CoreGraphics.framework/Resources/libCGXType.A.dylib
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0x195c78000 - 0x195c79fff libMobileCheckpoint.dylib arm64  <93cb1250802b34e8b0038236f2f1be02> /usr/lib/libMobileCheckpoint.dylib
0x195c7c000 - 0x195c96fff libMobileGestalt.dylib arm64  <0d296a1f3cbd39bca52fdaa3b4df2a34> /usr/lib/libMobileGestalt.dylib
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0x195ef0000 - 0x195ef0fff libassertion_extension.dylib arm64  <e06a4dfa6008338b934ee537d58d54c3> /usr/lib/libassertion_extension.dylib
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0x195fec000 - 0x195ff4fff libcupolicy.dylib arm64  <082e83a4bd1a371bb6efa2b7d9007097> /usr/lib/libcupolicy.dylib
0x196030000 - 0x19604dfff libextension.dylib arm64  <e2ed78a202593605b32575c0f22e08ea> /usr/lib/libextension.dylib
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0x196374000 - 0x196375fff liblangid.dylib arm64  <02a03c3dba573ae0ab3b32911c77efba> /usr/lib/liblangid.dylib
0x196378000 - 0x196384fff liblockdown.dylib arm64  <f3fabf14927e30f4889f04efcd61711c> /usr/lib/liblockdown.dylib
0x196388000 - 0x1963a1fff liblzma.5.dylib arm64  <f16086f89f1032d1aa3b80b559eddca9> /usr/lib/liblzma.5.dylib
0x196778000 - 0x196790fff libmis.dylib arm64  <3929204949543825a23a02585a45eff8> /usr/lib/libmis.dylib
0x1967dc000 - 0x1969d8fff libobjc.A.dylib arm64  <963fc34f80f9303da52a020af5a63e74> /usr/lib/libobjc.A.dylib
0x196ac0000 - 0x196addfff libresolv.9.dylib arm64  <7793473e15e13911809cb6a8162c0b94> /usr/lib/libresolv.9.dylib
0x196b10000 - 0x196bedfff libsqlite3.dylib arm64  <a97fddbf637f349ab395149f86cd80be> /usr/lib/libsqlite3.dylib
0x196c44000 - 0x196c76fff libtidy.A.dylib arm64  <74b893a0811730c8a33c8f56d841b292> /usr/lib/libtidy.A.dylib
0x196c88000 - 0x196d76fff libxml2.2.dylib arm64  <73e5c4db073c3f97b3d7a78fdc531e86> /usr/lib/libxml2.2.dylib
0x196d78000 - 0x196da1fff libxslt.1.dylib arm64  <e84a63dc1cdf33f38edcd1963e8bcac0> /usr/lib/libxslt.1.dylib
0x196da4000 - 0x196db5fff libz.1.dylib arm64  <263f8bc085593d578ea393ba40438ee3> /usr/lib/libz.1.dylib
0x196db8000 - 0x196dbcfff libcache.dylib arm64  <69f2d8d4d9ed3393b4e44bc425b538f2> /usr/lib/system/libcache.dylib
0x196dc0000 - 0x196dccfff libcommonCrypto.dylib arm64  <c126afa9b4eb3f8cbb5fee48a17b56c6> /usr/lib/system/libcommonCrypto.dylib
0x196dd0000 - 0x196dd3fff libcompiler_rt.dylib arm64  <7d48e08690f43daeaf8fdcb82d3ebb74> /usr/lib/system/libcompiler_rt.dylib
0x196dd4000 - 0x196ddbfff libcopyfile.dylib arm64  <126799884b2231498c7a5697b769aff5> /usr/lib/system/libcopyfile.dylib
0x196ddc000 - 0x196e33fff libcorecrypto.dylib arm64  <eeae3730f4bb3c8e91bd85f00b2314ce> /usr/lib/system/libcorecrypto.dylib
0x196e34000 - 0x196e5cfff libdispatch.dylib arm64  <91f808be126a33b982d5880c2454afde> /usr/lib/system/libdispatch.dylib
0x196e60000 - 0x196e62fff libdyld.dylib arm64  <cdf00d005c2f30efa821536ccb0b70f4> /usr/lib/system/libdyld.dylib
0x196e64000 - 0x196e64fff liblaunch.dylib arm64  <0d5f253a83673ecb9a55f667adf2c205> /usr/lib/system/liblaunch.dylib
0x196e68000 - 0x196e6dfff libmacho.dylib arm64  <08dc912ff3123d2abc59dd17889f2abc> /usr/lib/system/libmacho.dylib
0x196e70000 - 0x196e71fff libremovefile.dylib arm64  <d5239b98479b37538d63f1fd0fe35905> /usr/lib/system/libremovefile.dylib
0x196e74000 - 0x196e89fff libsystem_asl.dylib arm64  <314e1ff76a71372ca4bc80351f984376> /usr/lib/system/libsystem_asl.dylib
0x196e8c000 - 0x196e8dfff libsystem_blocks.dylib arm64  <b120e51ddfeb3a1ca33f448f54412428> /usr/lib/system/libsystem_blocks.dylib
0x196e90000 - 0x196f10fff libsystem_c.dylib arm64  <043c87b4428d34d4985264cebab5f687> /usr/lib/system/libsystem_c.dylib
0x196f14000 - 0x196f16fff libsystem_configuration.dylib arm64  <a666b752b9ea3289998dcf502fdeed0f> /usr/lib/system/libsystem_configuration.dylib
0x196f18000 - 0x196f19fff libsystem_coreservices.dylib arm64  <f73841bdf9a03defa5893ff3053889fa> /usr/lib/system/libsystem_coreservices.dylib
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0x19700c000 - 0x197010fff libsystem_platform.dylib arm64  <c1774ebd3158311c8ee629808cbf8e77> /usr/lib/system/libsystem_platform.dylib
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------------------------------
Xamarin Studio Configuration
------------------------------

=== Xamarin Studio ===

Version 5.9.3 (build 1)
Installation UUID: 09cbeda3-ba62-42ad-af02-fa11dddfa2a4
Runtime:
	Mono 4.0.1 ((detached/ed1d3ec)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400010044

=== Apple Developer Tools ===

Xcode 6.3.2 (7718)
Build 6D2105

=== Xamarin.iOS ===

Version: 8.10.1.64 (Enterprise Edition)
Hash: e6ebd18
Branch: master
Build date: 2015-05-21 21:55:09-0400

=== Xamarin.Android ===

Version: 5.1.3.1 (Enterprise Edition)
Android SDK: /Users/mstonis/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.3    (API level 10)
		4.0.3  (API level 15)
		4.1    (API level 16)
		4.2    (API level 17)
		4.3    (API level 18)
		4.4    (API level 19)
		4.4.87 (API level 20)
		5.0    (API level 21)
Java SDK: /usr
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)

=== Xamarin Android Player ===

Version: Unknown version
Location: /Applications/Xamarin Android Player.app

=== Xamarin.Mac ===

Version: 2.0.1.64 (Enterprise Edition)

=== Build Information ===

Release ID: 509030001
Git revision: 5a524e1726ed103fdd4fe37e0356f2b35466ce9d
Build date: 2015-06-02 16:35:08-04
Xamarin addins: 51957cfbd06be911b212671ad05c2c6221ac90f9

=== Operating System ===

Mac OS X 10.10.3
Darwin MacBook-Pro.local 14.3.0 Darwin Kernel Version 14.3.0
    Mon Mar 23 11:59:05 PDT 2015
    root:xnu-2782.20.48~5/RELEASE_X86_64 x86_64
Comment 1 Rolf Bjarne Kvinge [MSFT] 2015-06-05 03:59:13 UTC
This looks like memory corruption of some sort, and the randomness can make it tricky to track down.

The first step is to create a reproducible test case. In these cases where the crash only happens once in a while, my suggestion is to automate the app somehow. In your case you could try adding code that enters a view controller that crashes and then a couple of seconds later returns, and loop every 5s. Then leave the app running overnight, and see if it crashes - if not, then you need to find some other code sequence to iterate over. Once you have something that reliably crashes overnight, then remove chunks code from your project until you've created a minimal test project.

In my experience once you have a minimal test project, you end up understanding what's happening. If not, feel free to attach the project here, and we'll have a look.

Tip: it may be that the crash depends on the GC running at a specific time. In that case try adding the following code somewhere in the startup path:

>new Thread (() =>
>{
>    while (true) {
>        Thread.Sleep (10000);
>        GC.Collect ();
>    }
>}).Start ();

and see if the crash is more or less frequent (it may also be that the crash depends on high memory usage and/or memory warnings, in which case the above code snippet will make the crash less likely).
Comment 2 Sebastien Pouliot 2016-06-09 00:25:05 UTC
We have not received the requested information. If you are still experiencing this issue please provide all the requested information and re-open the bug report. Thanks!