Bug 2541 - CATiledLayer raised sigsegv
Summary: CATiledLayer raised sigsegv
Alias: None
Product: iOS
Classification: Xamarin
Component: XI runtime ()
Version: 5.0
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2011-12-16 13:49 UTC by JohanO
Modified: 2013-12-05 18:35 UTC (History)
2 users (show)

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

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Description JohanO 2011-12-16 13:49:25 UTC
Hi Guys. I'm making used of a CATildeLayer to do some drawing. With the latest MonoTouch 5.x version I get this trivial SIGSEGV that crashes my application on code that hasn't been touched and running on the appstore.

From the native stack trace I can see that it enters a trampoline. I have changed my trampoline setting on the build... I tried increasing it and it still gives me an issue...

-aot "nrgctx-trampolines=5072" -aot "nimt-trampolines=5027" -aot "ntrampolines=5027"

This trampolining, I have to admit still confuses the !@ out of me.

Native stacktrace:

	0   JustEnough                          0x01a2dec8 mono_handle_native_sigsegv + 456
	1   JustEnough                          0x01a13894 mono_sigsegv_signal_handler + 428
	2   libsystem_c.dylib                   0x37bb4539 _sigtramp + 48
	3   JustEnough                          0x00cbe4f4 JustEnough_IPad_CallSchedule_Calendar_CalendarBaseView_DrawCells_MonoTouch_CoreGraphics_CGContext_System_Drawing_RectangleF_System_Drawing_RectangleF + 5732
	4   JustEnough                          0x00cc2cc0 JustEnough_IPad_CallSchedule_Calendar_CalendarBaseView_DrawContents_MonoTouch_CoreGraphics_CGContext_System_Drawing_RectangleF + 520
	5   JustEnough                          0x00cc2a6c JustEnough_IPad_CallSchedule_Calendar_CalendarBaseView_Draw_System_Drawing_RectangleF + 252
	6   JustEnough                          0x006b5668 wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr + 200
	7   JustEnough                          0x01a134b8 mono_jit_runtime_invoke + 2892
	8   JustEnough                          0x01b0a370 mono_runtime_invoke + 200
	9   JustEnough                          0x01bc9744 monotouch_trampoline + 3140
	10  UIKit                               0x31b5df79 -[UIView(CALayerDelegate) drawLayer:inContext:] + 276
	11  QuartzCore                          0x376a5e1d -[CALayer drawInContext:] + 116
	12  QuartzCore                          0x377617e5 _ZL18tiled_layer_renderP16_CAImageProviderjjjjPv + 924
	13  QuartzCore                          0x376f4f29 _ZL21CAImageProviderThreadPjb + 368
	14  libdispatch.dylib                   0x30c63897 _dispatch_worker_thread2 + 258
	15  libsystem_c.dylib                   0x37b661cf _pthread_wqthread + 294
	16  libsystem_c.dylib                   0x37b660a4 start_wqthread + 8

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.
Comment 1 Sebastien Pouliot 2011-12-16 14:19:33 UTC
There are many kind of trampolines. Unless the crash log reports a lack of a specific one (it will give you a number) then the cause of the issue is likely elsewhere (and augmenting the number of trampolines won't give you anything, just more memory being allocated).

It be helpful to know which version of MonoTouch you used to build your application (the one on the appstore) so we can track all changes between it and the version you using now (5.0.x or 5.1.x ?)

Also we'll likely need a test case that shows the issue. Something around JustEnough_IPad_CallSchedule_Calendar_CalendarBaseView_DrawCells_MonoTouch_CoreGraphics_CGContext_System_Drawing_RectangleF_System_Drawing_RectangleF is causing this crash.
Comment 2 PJ 2013-11-19 17:05:04 UTC
This bug has been in the NEEDINFO state with no changes for the last 90 days. Can we put this back into the NEW or CONFIRMED state, or are we still awaiting response?

If there is no change in the status of this bug over the next two weeks, this bug will be marked as NORESPONSE.
Comment 3 PJ 2013-12-05 18:35:26 UTC
This bug has not been changed from the NEEDINFO state since my previous comment, marking as RESOLVED NORESPONSE.

Please feel free to REOPEN this bug at any time if you are still experiencing the issue. Please add the requested information and set the bug back to the NEW (or CONFIRMED) state.