Re: How do I debug weak_unregister_no_lock?
Re: How do I debug weak_unregister_no_lock?
- Subject: Re: How do I debug weak_unregister_no_lock?
- From: Gideon King <email@hidden>
- Date: Wed, 15 Jan 2014 12:34:34 +1000
I just had this problem come up again.
It happens when I pop a view controller, so there are a whole bunch of things being tidied up behind the scenes.
Although it is always happening at the same point in the code, I really have no idea where to look for debugging it.
Any tips on debugging this would be very much appreciated.
Thanks
Gideon
On 12 Jan 2014, at 11:54 am, Gideon King <email@hidden> wrote:
> I have seen this crash twice in running my code over 100 times, so it’s pretty hard to reproduce, but definitely there.
>
> It seems to be related to deallocating an OUIInspectorPane object, but when I look in the debugger, it is actually my subclass of that object. I have zombies turned on, but that didn’t seem to isolate the problem.
>
> Can anyone suggest a way of tracking this down?
>
> * thread #1: tid = 0x9b3267, 0x026c492b libobjc.A.dylib`weak_unregister_no_lock + 119, queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x2936f6d0)
> frame #0: 0x026c492b libobjc.A.dylib`weak_unregister_no_lock + 119
> frame #1: 0x026c50fa libobjc.A.dylib`objc_destroyWeak_slow(objc_object**) + 135
> frame #2: 0x002db8f1 NovaMind`-[OUIInspectorPane .cxx_destruct](self=0x168effd0, _cmd=0x026ca62e) + 113 at OUIInspectorPane.m:21
> frame #3: 0x026b32d4 libobjc.A.dylib`object_cxxDestructFromClass(objc_object*, objc_class*) + 128
> frame #4: 0x026b324f libobjc.A.dylib`object_cxxDestruct + 20
> frame #5: 0x026be22c libobjc.A.dylib`objc_destructInstance + 48
> frame #6: 0x02dfdecc CoreFoundation`-[NSObject(NSObject) __dealloc_zombie] + 156
> frame #7: 0x01327c56 UIKit`-[UIViewController dealloc] + 1818
> frame #8: 0x00361747 NovaMind`-[OUIViewController dealloc](self=0x168effd0, _cmd=0x026ca678) + 167 at OUIViewController.m:69
> frame #9: 0x01324975 UIKit`-[UIViewController release] + 89
> frame #10: 0x026c4e97 libobjc.A.dylib`objc_release + 71
> frame #11: 0x0120a5fc UIKit`__destroy_helper_block_121 + 124
> frame #12: 0x04c557a5 libsystem_sim_blocks.dylib`_Block_release + 207
> frame #13: 0x01277e3f UIKit`-[UIViewAnimationBlockDelegate dealloc] + 66
> frame #14: 0x026c5692 libobjc.A.dylib`objc_object::sidetable_release(bool) + 268
> frame #15: 0x026c6adf libobjc.A.dylib`-[NSObject release] + 25
> frame #16: 0x02ce1cb0 CoreFoundation`CFRelease + 272
> frame #17: 0x02de974e CoreFoundation`-[__NSDictionaryI dealloc] + 126
> frame #18: 0x026c5692 libobjc.A.dylib`objc_object::sidetable_release(bool) + 268
> frame #19: 0x026c4e81 libobjc.A.dylib`objc_release + 49
> frame #20: 0x026c5ce7 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 537
> frame #21: 0x02d01968 CoreFoundation`_CFAutoreleasePoolPop + 24
> frame #22: 0x02d066c3 CoreFoundation`__CFRunLoopRun + 1971
> frame #23: 0x02d05ac3 CoreFoundation`CFRunLoopRunSpecific + 467
> frame #24: 0x02d058db CoreFoundation`CFRunLoopRunInMode + 123
> frame #25: 0x040529e2 GraphicsServices`GSEventRunModal + 192
> frame #26: 0x04052809 GraphicsServices`GSEventRun + 104
> frame #27: 0x01215d3b UIKit`UIApplicationMain + 1225
> frame #28: 0x0000216d NovaMind`main(argc=1, argv=0xbfffec78) + 141 at main.m:16
>
> Thanks
>
> Gideon
>
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