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List:       freebsd-hackers
Subject:    Re: DEBUG - analysing core dumps
From:       "Greg 'groggy' Lehey" <grog () freebsd ! org>
Date:       2011-05-27 1:02:21
Message-ID: 20110527010221.GE77148 () dereel ! lemis ! com
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On Wednesday, 25 May 2011 at 13:20:31 -0400, Andrew Duane wrote:
> Damien Fleuriot wrote:
>>
>> Sadly, getting a backtrace with "bt" gives me more lines with "??",
>> which is totally not helpful:
>> [SNIP]
>> #13 0x00007fffff1f9d70 in ?? ()
>> #14 0x0000000000000000 in ?? ()
>> #15 0x6f70732f7261762f in ?? ()
>> #16 0x6c737973722f6c6f in ?? ()
>> #17 0x5f6e70766f2f676f in ?? ()
>> #18 0x746174732e676f6c in ?? ()
>> #19 0x0000000000000065 in ?? ()
>> #20 0x0000000000000000 in ?? ()
>> [SNIP]
>
> For what it's worth, the addresses shown in frames 15, 16, 17, and
> 18 are ASCII:
>
> ops/rav/
> lsysr/lo
> _npvo/go
> tats.gol

This smells of a smashed stack.  Something has overwritten parts of it
with text.

Greg
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