Re: help trying to locate sigsegv error please
Re: help trying to locate sigsegv error please
- Subject: Re: help trying to locate sigsegv error please
- From: Ben Dougall <email@hidden>
- Date: Fri, 15 Aug 2003 11:44:45 +0100
On Friday, August 15, 2003, at 12:59 am, publiclook wrote:
run your application in the debugger. When it crashes, the debugger
will show you where and why.
i had tried that and nothing happened. no information, no error. i
don't think i'd left it long enough to fail though. it must go much
slower under gdb.
turned out i was over-running the data.
thanks.
On Thursday, August 14, 2003, at 03:23 PM, Ben Dougall wrote:
does the fact that my app exits, always with the same input with
signal 11 (SIGSEGV) sporadically, strongly point towards a memory
management problem? the reason i mention 'same input' and
'sporadically' is because i'm doing a lot of stepping along and
reading data from an NSData object using a pointer gained by -bytes
and adding adding another variable to that pointer, so over run is a
possibility there and that error could be caused by over run like
that? but the same input sometimes crashes, sometimes doesn't, so for
that reason i don't think it is over stepping - it would over run
every time and exit with signal 11 sigsegv every time right?
signal 11 (SIGSEGV) is cuased by attempting to access something that
i shouldn't be - is that correct? so releasing / deallocating an
object, then trying to access it in some way would give that error
for sure?
i haven't got a clue what's causing it. there's quite a lot of code
but all the alloc and init situations, which there aren't many of,
are tallied to releases and there are no extra releases.
can it be cause by not releasing something?
why sporadic? << that seems odd to me.
i don't know which part is causing the problem, and the whole thing
is too much code to post. suggestions? please :)
thanks, ben.
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