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POCan somebody make sense of that crash in Monotouch 5.2.6 happening with SGen on?
 

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  1. POCan somebody make sense of that crash in Monotouch 5.2.6 happening with SGen on?
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    <p>Randomly I'm getting the crash below in the iOS5 Simulator with Monotouch 5.2.6 and SGen being enabled. This is a debug build. It is happening after clicking a button. That click spins off a new thread that shows a little progress indicator. When it is done thinking, it will exchange two views with animation (running all this on the UI thread).</p> <p>I would like to know where to start because I don't get a managed stack trace. Am I right that it is trying to layout a UITableViewCell that no longer exists?</p> <pre><code>Native stacktrace: 0 MobileApp 0x00094fbc mono_handle_native_sigsegv + 284 1 MobileApp 0x0000be72 mono_sigsegv_signal_handler + 178 2 libsystem_c.dylib 0x9c5ee59b _sigtramp + 43 3 ??? 0xffffffff 0x0 + 4294967295 4 QuartzCore 0x04176891 -[CALayer actionForKey:] + 89 5 QuartzCore 0x0417982d _ZL12actionForKeyP7CALayerPN2CA11TransactionEP8NSString + 82 6 QuartzCore 0x0417c9c3 _ZN2CA5Layer12begin_changeEPNS_11TransactionEjRP11objc_object + 131 7 QuartzCore 0x04181f82 _ZN2CA5Layer12set_positionERKNS_4Vec2IdEEb + 388 8 QuartzCore 0x04178205 -[CALayer setPosition:] + 68 9 QuartzCore 0x04177cba -[CALayer setFrame:] + 675 10 UIKit 0x021d8590 -[UIView(Geometry) setFrame:] + 198 11 UIKit 0x022e1731 -[UILabel setFrame:] + 233 12 UIKit 0x02439731 -[UITableViewCellLayoutManager layoutSubviewsOfCell:] + 4511 13 UIKit 0x02390e34 -[UITableViewCell layoutSubviews] + 2650 14 UIKit 0x021e3322 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 178 15 CoreFoundation 0x011d6e72 -[NSObject performSelector:withObject:] + 66 16 QuartzCore 0x0417392d -[CALayer layoutSublayers] + 266 17 QuartzCore 0x0417d827 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 231 18 QuartzCore 0x04103fa7 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 377 19 QuartzCore 0x04105ea6 _ZN2CA11Transaction6commitEv + 374 20 QuartzCore 0x041059d3 _ZN2CA11Transaction14release_threadEPv + 65 21 libsystem_c.dylib 0x9c5dfe0c _pthread_tsd_cleanup + 85 22 libsystem_c.dylib 0x9c59864c _pthread_exit + 146 23 libsystem_c.dylib 0x9c5989a0 pthread_exit + 33 24 MobileApp 0x0020434e thread_exit + 30 25 MobileApp 0x00203d03 thread_start_routine + 163 26 MobileApp 0x001aeb20 gc_start_thread + 80 27 libsystem_c.dylib 0x9c596ed9 _pthread_start + 335 28 libsystem_c.dylib 0x9c59a6de thread_start + 34 </code></pre>
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    1. COnot sure it is trying to layout something... to me it seems to accessing some delegate which points nowhere... what exactly is the thread doing ? Is it by any chance creating or disposing of some UI objects ?
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      1. POCan somebody make sense of that crash in Monotouch 5.2.6 happening with SGen on?
      1. USYahia
    2. CONo explicit dispose. And yes, it is generating UI objects. It is removing a controller and its view from screen and adds another one.
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      1. POCan somebody make sense of that crash in Monotouch 5.2.6 happening with SGen on?
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    3. COI suspect some problem with interacting between the thread spawned by the button click and the UI thread... but it is hard to toll from that stack trace alone...
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      1. POCan somebody make sense of that crash in Monotouch 5.2.6 happening with SGen on?
      1. USYahia
 

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