Re: Crash log - "Backtrace not available"
Re: Crash log - "Backtrace not available"
- Subject: Re: Crash log - "Backtrace not available"
- From: Daniel Jalkut <email@hidden>
- Date: Sat, 08 Oct 2005 11:08:14 -0400
On Oct 8, 2005, at 10:22 AM, Jonathan del Strother wrote:
I've been sent a crash log which doesn't have a backtrace - it just
says "Backtrace not available". Umm...any suggestions on debugging
this? What might cause it to not give a backtrace?
I think the backtrace depends on following stack frames. The PowerPC
stack pointer is $r1, so if you for instance break during your
program's execution and slam a new value into $r1, you'll slam your
backtrace as well. I'm not sure what kind of corruption is required
to prompt "Backtrace not available," but suffice to say there are
plenty of ways to screw your stack frame up.
More information on PowerPC stack is available here:
http://developer.apple.com/documentation/mac/runtimehtml/RTArch-59.html
Daniel
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