How to understand this crash? : SIGBUS BUS_ADRALN

Question

Thats in the stack trace and i dont understand this error:

0   CoreFoundation  0x30f57648 ___CFBasicHashFindBucket_Linear_NoCollision + 92  
1   CoreFoundation  0x30f59688 __CFBasicHashAddValue + 692
2   CoreFoundation  0x30eaff9f CFDictionarySetValue + 74
3   UIKit   0x35721a0b -[UITouchesEvent _gestureRecognizersForWindow:] + 282
4   UIKit   0x357215d5 -[UIWindow _sendGesturesForEvent:] + 28
5   UIKit   0x357214ab -[UIWindow sendEvent:] + 66
6   UIKit   0x3570a313 -[UIApplication sendEvent:] + 298
7   UIKit   0x35709c53 _UIApplicationHandleEvent + 5090
8   GraphicsServices    0x31a11e77 PurpleEventCallback + 666
9   CoreFoundation  0x30f1ba97     __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 26
10  CoreFoundation  0x30f1d83f __CFRunLoopDoSource1 + 166
11  CoreFoundation  0x30f1e60d __CFRunLoopRun + 520
12  CoreFoundation  0x30eaeec3 CFRunLoopRunSpecific + 230
13  CoreFoundation  0x30eaedcb CFRunLoopRunInMode + 58
14  GraphicsServices    0x31a1141f GSEventRunModal + 114
15  GraphicsServices    0x31a114cb GSEventRun + 62
16  UIKit   0x35734d69 -[UIApplication _run] + 404
17  UIKit   0x35732807 UIApplicationMain + 670
18  AppName 0x00002e3b 0x1000 + 7739  

The crash occurs sometimes, i dont know on what kind of action it occurs.

How can i understand this issue and can solve my problem?

Answer 1

I think the problem may be that you are re-using gesture objects for more than one UIView based object. They cannot be re-used. I have had similar problems in the past (not exactly the same crash). The documentation on it highlights the limitation. I suppose there is internal state (the hash table seen in the crash) which gets updated in conflicting ways for the different UI View based objects.

If you are not re-using them, try removing all of them temporarily just to confirm the system is otherwise stable.