Isolating a bug?
Isolating a bug?
- Subject: Isolating a bug?
- From: Gregory Weston <email@hidden>
- Date: Wed, 6 Apr 2005 06:46:03 -0400
From a program that's been shipping for about a year now without
stability complaints, I user sent a crash log that I find vexing. Why?
Because here's the call stack.
Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000006
Thread 0 Crashed:
0 com.apple.CoreFoundation 0x901939cc CFHash + 0x18
1 com.apple.CoreFoundation 0x90192d28 __CFDictionaryFindBuckets1b +
0x70
2 com.apple.CoreFoundation 0x90192184 CFDictionaryGetValue + 0xec
3 com.apple.CoreFoundation 0x901b0fb0
_CFApplicationPreferencesCreateValueForKey + 0x6c
4 com.apple.Foundation 0x909fb38c -[NSUserDefaults
objectForKey:] + 0x98
5 my.program.signature 0x00008658 -[MyApplication
methodTakingAString:] + 0x5c
The routine identified in line 5 is called repeatedly (although not
rapidly) while the program is running - it had been invoked hundreds of
times without error during this session. The argument to objectForKey:
at line 4 is a freshly-created from NSString>>stringWithFormat:. I'm
not sure where to start looking for the cause of a problem that
manifests five invocations into external code. Advice?
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