Re: Isolating a bug?
Re: Isolating a bug?
- Subject: Re: Isolating a bug?
- From: Ondra Cada <email@hidden>
- Date: Wed, 6 Apr 2005 13:41:06 +0200
On 6.4.2005, at 12:46, Gregory Weston wrote:
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?
For starters, log the "freshly-created from NSString>>stringWithFormat"
just before the objectForKey: gets called. There is still a chance it
gets something messed up somehow...
If that does not help, I kind of fear the problem *may* be elsewhere,
in an uninitialized pointer or somrthing alike, whose result are
mangled in-memory data. That's a bug alas very difficult to find, and
assembly-level debugging might be needed. Well, hopefully, the cause
would be something more trivial :)
---
Ondra Čada
OCSoftware: email@hidden http://www.ocs.cz
private email@hidden http://www.ocs.cz/oc
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