Would appreciate some insight isolating this, some semi-repeatable crashes in an iPhone app of moderate complexity …
The crashes in question occur (sometimes, though not consistently) when pressing a UIButton on a particular screen within the app.
(Not sure yet, though the issue may be manifesting itself more under lower memory conditions.)
A typical crash log is excerpted below.
Without getting into a lot of unnecessary detail at this point — based on the log below, which is typical of several — would anyone have any insights as to the problem occurring, and where to look and/or how to further troubleshoot?
Any help is very much appreciated!
Thanks.
~~~
Incident Identifier: ...
CrashReporter Key: ...
Process: AppName [1532]
Path: /var/mobile/Applications/12345678-9ABC-DEF0-1234-56789ABCDEF0/AppName.app/AppName
Identifier: AppName
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2010-01-05 18:20:28.081 -0800
OS Version: iPhone OS 3.0.1 (7A400)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x30011944 objc_msgSend + 24
1 UIKit 0x3096e0d0 -[UIApplication sendAction:to:from:forEvent:] + 128
2 UIKit 0x3096e038 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 32
3 UIKit 0x3096e000 -[UIControl sendAction:to:forEvent:] + 44
4 UIKit 0x3096dc58 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 528
5 UIKit 0x309a660c -[UIControl touchesBegan:withEvent:] + 260
6 UIKit 0x30935100 _UIGestureRecognizerUpdateObserver + 2136
7 CoreFoundation 0x3020cd8a __CFRunLoopDoObservers + 466
8 CoreFoundation 0x3025488c CFRunLoopRunSpecific + 1812
9 CoreFoundation 0x30254164 CFRunLoopRunInMode + 44
10 GraphicsServices 0x3204529c GSEventRunModal + 188
11 UIKit 0x308f0374 -[UIApplication _run] + 552
12 UIKit 0x308eea8c UIApplicationMain + 960
13 AppName 0x00002090 0x1000 + 4240
14 AppName 0x0000202c 0x1000 + 4140
Thread 1:
0 libSystem.B.dylib 0x31d47158 mach_msg_trap + 20
1 libSystem.B.dylib 0x31d49ed8 mach_msg + 60
2 CoreFoundation 0x3025454e CFRunLoopRunSpecific + 982
3 CoreFoundation 0x30254164 CFRunLoopRunInMode + 44
4 WebCore 0x3588dbc8 __ZL12RunWebThreadPv + 412
5 libSystem.B.dylib 0x31d705a0 _pthread_body + 20
Thread 0 crashed with ARM Thread State:
r0: 0x0019e420 r1: 0x30128c94 r2: 0x00014fac r3: 0x001ce9a0
r4: 0x001a56e4 r5: 0x00000000 r6: 0x00000000 r7: 0x2ffff1e0
r8: 0x00014fac r9: 0x001a97c0 r10: 0x001ce9a0 r11: 0x00000001
ip: 0x388ed9f0 sp: 0x2ffff1b8 lr: 0x3096e0d8 pc: 0x30011944
cpsr: 0x200f0010
~~~
EXC_BAD_ACCESS + objc_msgSend almost always equal a message sent to a deallocated object.
Run the static analyzer and it should help.
Also enabling NSZombies.
Then debug and have fun!