Monotouch SIGSEV In simulator only
I'm pretty new to Monotouch, and running into an error that is baffling me. I made a binding to an objective-c library for a sliding-style view ( https://github.com/edgecase/ECSlidingViewController ), and have been getting SIGSEVs while executing native code during the use of that library (specifically, it happens when I try to reveal the bottom view from the sliding controller).
Stacktrace:
at (wrapper managed-to-native) System.Runtime.InteropServices.GCHandle.CheckCurrentDomain (int) <IL 0x00021, 0xffffffff>
at System.Runtime.InteropServices.GCHandle.op_Explicit (intptr) [0x0001b] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.InteropServices/GCHandle.cs:124
at System.Runtime.InteropServices.GCHandle.FromIntPtr (intptr) [0x00000] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System.Runtime.InteropServices/GCHandle.cs:169
at MonoTouch.ObjCRuntime.BlockDescriptor.CopyHelper (MonoTouch.ObjCRuntime.BlockLiteral*,MonoTouch.ObjCRuntime.BlockLiteral*) [0x00000] in /Developer/MonoTouch/Source/monotouch/src/shared/ObjCRuntime/Blocks.cs:54
at (wrapper native-to-managed) MonoTouch.ObjCRuntime.BlockDescriptor.CopyHelper (MonoTouch.ObjCRuntime.BlockLiteral*,MonoTouch.ObjCRuntime.BlockLiteral*) <IL 0x0001e, 0xffffffff>
at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging.void_objc_msgSendSuper_int_IntPtr_IntPtr (intptr,intptr,int,intptr,intptr) <IL 0x00028, 0xffffffff>
at Enriquez.ECSlidingViewController.ECSlidingViewController.AnchorTopView (Enriquez.ECSlidingViewController.ECSide,Enriquez.ECSlidingViewController.ECAnimations,Enriquez.ECSlidingViewController.ECOnComplete) <IL 0x00097, 0x002ef>
at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___int_object_object (object,intptr,intptr,intptr) <IL 0x00066, 0xffffffff>
at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging.void_objc_msgSendSuper_int (intptr,intptr,int) <IL 0x00025, 0xffffffff>
at Enriquez.ECSlidingViewController.ECSlidingViewController.AnchorTopView (Enriquez.ECSlidingViewController.ECSide) <IL 0x0002d, 0x0009f>
at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___int (object,intptr,intptr,intptr) <IL 0x00054, 0xffffffff>
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x0009f, 0xffffffff>
at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
at FanApp.Application.Main (string[]) [0x00000] in /Users/markrubeo/Projects/FanApp/MonoTouch/Test Stuff/FanApp/Fan App/FanApp/Main.cs:17
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
Native stacktrace:
0 FanApp 0x00098adc mono_handle_native_sigsegv + 284
1 FanApp 0x0000c3b8 mono_sigsegv_signal_handler + 248
2 libsystem_c.dylib 0x99be28cb _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 FanApp 0x00112aba GCHandle_CheckCurrentDomain + 26
5 ??? 0x0d86e766 0x0 + 226944870
6 ??? 0x0d86e668 0x0 + 226944616
7 ??? 0x0d86e590 0x0 + 226944400
8 ??? 0x0d86e4f8 0x0 + 226944248
9 ??? 0x0d86db7c 0x0 + 226941820
10 libsystem_sim_blocks.dylib 0x0243acb6 _Block_call_copy_helper + 29
11 libsystem_sim_blocks.dylib 0x0243b73f _Block_copy_internal + 228
12 FanApp 0x00004a91 -[ECSlidingViewController anchorTopViewTo:animations:onComplete:] + 545
13 ??? 0x0d86e458 0x0 + 226944088
14 ??? 0x0d86d2f0 0x0 + 226939632
15 ??? 0x0d86d505 0x0 + 226940165
16 FanApp 0x00010782 mono_jit_runtime_invoke + 722
17 FanApp 0x00173c5e mono_runtime_invoke + 126
18 FanApp 0x002169a6 monotouch_trampoline + 3686
19 FanApp 0x00004864 -[ECSlidingViewController anchorTopViewTo:] + 84
20 ??? 0x08618c4c 0x0 + 140610636
21 ??? 0x06bfbd28 0x0 + 113229096
22 ??? 0x08618bb0 0x0 + 140610480
23 FanApp 0x00010782 mono_jit_runtime_invoke + 722
24 FanApp 0x00173c5e mono_runtime_invoke + 126
25 FanApp 0x002169a6 monotouch_trampoline + 3686
26 FanApp 0x00004700 -[ECSlidingViewController updateTopViewHorizontalCenterWithRecognizer:] + 1680
27 UIKit 0x00bede29 _UIGestureRecognizerSendActions + 143
28 UIKit 0x00bed133 -[UIGestureRecognizer _updateGestureWithEvent:] + 379
29 UIKit 0x00bee3bf -[UIGestureRecognizer _delayedUpdateGesture] + 46
30 UIKit 0x00bf0a21 ___UIGestureRecognizerUpdate_block_invoke_0541 + 57
31 UIKit 0x00bf097c _UIGestureRecognizerApplyBlocksToArray + 277
32 UIKit 0x00be93d7 _UIGestureRecognizerUpdate + 1026
33 UIKit 0x0094e1a2 -[UIWindow _sendGesturesForEvent:] + 1121
34 UIKit 0x0094e532 -[UIWindow sendEvent:] + 93
35 UIKit 0x00934dc4 -[UIApplication sendEvent:] + 464
36 UIKit 0x00928634 _UIApplicationHandleEvent + 8196
37 GraphicsServices 0x025f5ef5 PurpleEventCallback + 1274
38 CoreFoundation 0x01c0f195 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
39 CoreFoundation 0x01b73ff2 __CFRunLoopDoSource1 + 146
40 CoreFoundation 0x01b728da __CFRunLoopRun + 2218
41 CoreFoundation 0x01b71d84 CFRunLoopRunSpecific + 212
42 CoreFoundation 0x01b71c9b CFRunLoopRunInMode + 123
43 GraphicsServices 0x025f47d8 GSEventRunModal + 190
44 GraphicsServices 0x025f488a GSEventRun + 103
45 UIKit 0x00926626 UIApplicationMain + 1163
46 ??? 0x0861397d 0x0 + 140589437
47 ??? 0x085974f8 0x0 + 140080376
48 ??? 0x08597100 0x0 + 140079360
49 ??? 0x08597256 0x0 + 140079702
50 FanApp 0x00010782 mono_jit_runtime_invoke + 722
51 FanApp 0x00173c5e mono_runtime_invoke + 126
52 FanApp 0x00177e54 mono_runtime_exec_main + 420
53 FanApp 0x0017d245 mono_runtime_run_main + 725
54 FanApp 0x0006de15 mono_jit_exec + 149
55 FanApp 0x0020bc04 main + 1988
56 FanApp 0x00009685 start + 53
57 ??? 0x00000004 0x0 + 4
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
The weird part about this is that it only happens when I run the app in the iOS simulator. On devices, everything appears to work fine.
Anyone have any clue what's going on?
ETA: Crash Report:
Process: FanApp [50509]
Path: /Users/USER/Library/Application Support/iPhone Simulator/*/
Identifier: FanApp
Version: ???
Code Type: X86 (Native)
Parent Process: launchd [151]
User ID: 501
Date/Time: 2013-05-22 17:16:55.967 -0400
OS Version: Mac OS X 10.8.3 (12D78)
Report Version: 10
Crashed Thread: 0
Exception Type: EXC_BAD_ACCESS (SIGABRT)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000008
VM Regions Near 0x8:
--> __PAGEZERO 0000000000000000-0000000000001000 [ 4K] ---/--- SM=NUL /Users/USER/Library/Application Support/iPhone Simulator/*/FanApp.app/FanApp
__TEXT 0000000000001000-00000000002cd000 [ 2864K] r-x/rwx SM=COW /Users/USER/Library/Application Support/iPhone Simulator/*/FanApp.app/FanApp
Application Specific Information:
iPhone Simulator 369.2, iPhone OS 5.1 (iPhone/9B176)
abort() called
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x94925a6a __pthread_kill + 10
1 libsystem_c.dylib 0x99bf7b2f pthread_kill + 101
2 libsystem_c.dylib 0x99c2e4ec abort + 168
3 FanApp 0x00098d1a mono_handle_native_sigsegv + 858
4 FanApp 0x0000c3b8 mono_sigsegv_signal_handler + 248
5 libsystem_c.dylib 0x99be28cb _sigtramp + 43
6 ??? 0xffffffff 0 + 4294967295
7 FanApp 0x0000c2c0 mono_sigill_signal_handler + 64
8 FanApp 0x00112aba GCHandle_CheckCurrentDomain + 26
9 ??? 0x0d86e766 0 + 226944870
10 ??? 0x0d86e668 0 + 226944616
11 ??? 0x0d86e590 0 + 226944400
12 ??? 0x0d86e4f8 0 + 226944248
13 ??? 0x0d86db7c 0 + 226941820
14 libsystem_sim_blocks.dylib 0x0243acb6 _Block_call_copy_helper + 29
15 libsystem_sim_blocks.dylib 0x0243b73f _Block_copy_internal + 228
16 FanApp 0x00004a91 -[ECSlidingViewController anchorTopViewTo:animations:onComplete:] + 545
17 ??? 0x0d86e458 0 + 226944088
18 ??? 0x0d86d2f0 0 + 226939632
19 ??? 0x0d86d505 0 + 226940165
20 FanApp 0x00010782 mono_jit_runtime_invoke + 722
21 FanApp 0x00173c5e mono_runtime_invoke + 126
22 FanApp 0x002169a6 monotouch_trampoline + 3686
23 FanApp 0x00004864 -[ECSlidingViewController anchorTopViewTo:] + 84
24 ??? 0x08618c4c 0 + 140610636
25 ??? 0x06bfbd28 0 + 113229096
26 ??? 0x08618bb0 0 + 140610480
27 FanApp 0x00010782 mono_jit_runtime_invoke + 722
28 FanApp 0x00173c5e mono_runtime_invoke + 126
29 FanApp 0x002169a6 monotouch_trampoline + 3686
30 FanApp 0x00004700 -[ECSlidingViewController updateTopViewHorizontalCenterWithRecognizer:] + 1680
31 UIKit 0x00bede29 _UIGestureRecognizerSendActions + 143
32 UIKit 0x00bed133 -[UIGestureRecognizer _updateGestureWithEvent:] + 379
33 UIKit 0x00bee3bf -[UIGestureRecognizer _delayedUpdateGesture] + 46
34 UIKit 0x00bf0a21 ___UIGestureRecognizerUpdate_block_invoke_0541 + 57
35 UIKit 0x00bf097c _UIGestureRecognizerApplyBlocksToArray + 277
36 UIKit 0x00be93d7 _UIGestureRecognizerUpdate + 1026
37 UIKit 0x0094e1a2 -[UIWindow _sendGesturesForEvent:] + 1121
38 UIKit 0x0094e532 -[UIWindow sendEvent:] + 93
39 UIKit 0x00934dc4 -[UIApplication sendEvent:] + 464
40 UIKit 0x00928634 _UIApplicationHandleEvent + 8196
41 GraphicsServices 0x025f5ef5 PurpleEventCallback + 1274
42 CoreFoundation 0x01c0f195 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
43 CoreFoundation 0x01b73ff2 __CFRunLoopDoSource1 + 146
44 CoreFoundation 0x01b728da __CFRunLoopRun + 2218
45 CoreFoundation 0x01b71d84 CFRunLoopRunSpecific + 212
46 CoreFoundation 0x01b71c9b CFRunLoopRunInMode + 123
47 GraphicsServices 0x025f47d8 GSEventRunModal + 190
48 GraphicsServices 0x025f488a GSEventRun + 103
49 UIKit 0x00926626 UIApplicationMain + 1163
50 ??? 0x0861397d 0 + 140589437
51 ??? 0x085974f8 0 + 140080376
52 ??? 0x08597100 0 + 140079360
53 ??? 0x08597256 0 + 140079702
54 FanApp 0x00010782 mono_jit_runtime_invoke + 722
55 FanApp 0x00173c5e mono_runtime_invoke + 126
56 FanApp 0x00177e54 mono_runtime_exec_main + 420
57 FanApp 0x0017d245 mono_runtime_run_main + 725
58 FanApp 0x0006de15 mono_jit_exec + 149
59 FanApp 0x0020bc04 main + 1988
60 FanApp 0x00009685 start + 53
Thread 1:
0 libsystem_kernel.dylib 0x949269ae kevent + 10
1 libdispatch.dylib 0x02474372 _dispatch_mgr_invoke + 918
2 libdispatch.dylib 0x02472be1 _dispatch_mgr_thread + 53
Thread 2:
0 libsystem_kernel.dylib 0x94925b3e __recvfrom + 10
1 libsystem_c.dylib 0x99c80bbf recv$UNIX2003 + 54
2 FanApp 0x0020d021 recv_uninterrupted + 81
3 FanApp 0x0020e88b monotouch_process_connection + 107
4 FanApp 0x0020ddef monotouch_connect_wifi + 3279
5 FanApp 0x0020cd07 monotouch_configure_debugging + 2311
6 FanApp 0x0020bce5 -[CocoaThreadInitializer entryPoint:] + 133
7 Foundation 0x005da4d6 -[NSThread main] + 76
8 Foundation 0x005da447 __NSThread__main__ + 1258
9 libsystem_c.dylib 0x99bf65b7 _pthread_start + 344
10 libsystem_c.dylib 0x99be0d4e thread_start + 34
Thread 3:
0 libsystem_kernel.dylib 0x949237d2 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x94922cb0 mach_msg + 68
2 FanApp 0x000de03a mach_exception_thread + 90
3 FanApp 0x0020816d GC_start_routine + 93
4 libsystem_c.dylib 0x99bf65b7 _pthread_start + 344
5 libsystem_c.dylib 0x99be0d4e thread_start + 34
Thread 4:
0 libsystem_kernel.dylib 0x9492380e semaphore_wait_trap + 10
1 FanApp 0x001e91ea mono_sem_wait + 26
2 FanApp 0x00112d2a finalizer_thread + 74
3 FanApp 0x001aeca6 start_wrapper + 422
4 FanApp 0x001e0c6a thread_start_routine + 154
5 FanApp 0x0020816d GC_start_routine + 93
6 libsystem_c.dylib 0x99bf65b7 _pthread_start + 344
7 libsystem_c.dylib 0x99be0d4e thread_start + 34
Thread 5:
0 libsystem_kernel.dylib 0x94925b3e __recvfrom + 10
1 libsystem_c.dylib 0x99c80bbf recv$UNIX2003 + 54
2 FanApp 0x0020d021 recv_uninterrupted + 81
3 FanApp 0x0020d104 sdb_recv + 52
4 FanApp 0x000af49a debugger_thread + 186
5 FanApp 0x001e0c6a thread_start_routine + 154
6 FanApp 0x0020816d GC_start_routine + 93
7 libsystem_c.dylib 0x99bf65b7 _pthread_start + 344
8 libsystem_c.dylib 0x99be0d4e thread_start + 34
Thread 6:
0 libsystem_kernel.dylib 0x94925c72 __semwait_signal + 10
1 libsystem_c.dylib 0x99c80a55 nanosleep$UNIX2003 + 189
2 libsystem_c.dylib 0x99c8091e usleep$UNIX2003 + 60
3 FanApp 0x00211342 monotouch_pump_gc + 50
4 libsystem_c.dylib 0x99bf65b7 _pthread_start + 344
5 libsystem_c.dylib 0x99be0d4e thread_start + 34
Thread 7:: WebThread
0 libsystem_kernel.dylib 0x949237d2 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x94922cb0 mach_msg + 68
2 CoreFoundation 0x01c0f10a __CFRunLoopServiceMachPort + 186
3 CoreFoundation 0x01b725d5 __CFRunLoopRun + 1445
4 CoreFoundation 0x01b71d84 CFRunLoopRunSpecific + 212
5 CoreFoundation 0x01b71c9b CFRunLoopRunInMode + 123
6 WebCore 0x03933420 RunWebThread(void*) + 560
7 libsystem_c.dylib 0x99bf65b7 _pthread_start + 344
8 libsystem_c.dylib 0x99be0d4e thread_start + 34
Thread 0 crashed with X86 Thread State (32-bit):
eax: 0x00000000 ebx: 0x07ad42e8 ecx: 0xbfffbc2c edx: 0x94925a6a
edi: 0xacd18a28 esi: 0x00000006 ebp: 0xbfffbc48 esp: 0xbfffbc2c
ss: 0x00000023 efl: 0x00000206 eip: 0x94925a6a cs: 0x0000000b
ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f
cr2: 0x010cd88c
Logical CPU: 0
Binary Images:
// Omitted to get under character limit
External Modification Summary:
Calls made by other processes targeting this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by this process:
task_for_pid: 0
thread_create: 0
thread_set_state: 0
Calls made by all processes on this machine:
task_for_pid: 20396
thread_create: 0
thread_set_state: 66
VM Region Summary:
ReadOnly portion of Libraries: Total=131.8M resident=44.7M(34%) swapped_out_or_unallocated=87.1M(66%)
Writable regions: Total=60.1M written=3060K(5%) resident=9756K(16%) swapped_out=0K(0%) unallocated=50.6M(84%)
REGION TYPE VIRTUAL
=========== =======
CG image 16K
CoreAnimation 328K
MALLOC 41.7M
MALLOC guard page 32K
Memory tag=35 9900K
Stack 68.8M
VM_ALLOCATE 2456K
__DATA 8484K
__LINKEDIT 50.5M
__OBJC 4K
__PAGEZERO 4K
__TEXT 81.3M
__UNICODE 544K
mapped file 237.1M
shared memory 12K
=========== =======
TOTAL 500.7M
asked on Stack Overflow May 22, 2013 by 
user2410983
user24109832 Answers
It looks like a problem with marshaling an Objective-C block to a managed delegate in ECSlidingViewController.AnchorTopView.
We do not currently support marshaling Objective-C blocks (that didn't originate from a managed delegate in the first place), you'll end up with a crash just like this one.
If you do not need to override ECSlidingViewController.AnchorTopView, you can just type the block as an IntPtr in the binding, so it would be something like this (note that I'm just guessing about how you did your binding):
interface ECSlidingViewController {
void AnchorTopView (ECSide first, ECAnimations second, IntPtr block);
}
If you're interested here is someone with a similar problem (and this forum thread contains a bit more explanation).
answered on Stack Overflow May 22, 2013 by 
Rolf Bjarne Kvinge
Rolf Bjarne Kvinge"Got a SIGSEGV while executing native code" may be indicate that some Actions assigned to UI elements in InterfaceBuilder are not found when app is executing. Verify all IBActions connected with your UIElements (UIButtons, GesturesRecognizers, etc.). Clear it and reassign to correct IBAction in .h files. Pay attention specially in duplicate Views.
answered on Stack Overflow Jul 3, 2013 by 
orafaelreis
orafaelreisUser contributions licensed under CC BY-SA 3.0