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Re: seg fault in DDD


From: Andreas Zeller
Subject: Re: seg fault in DDD
Date: 05 Feb 2001 07:55:10 +0100
User-agent: Gnus/5.0807 (Gnus v5.8.7) XEmacs/21.1 (Channel Islands)

Hi!

address@hidden (Nils Ellmenreich) writes:

> While debugging mozilla, a segfault in mozilla occurs. I get a back trace
> by typing 'where' in the gdb sub window. Now I want the DDD back trace
> window Status->backtrace. It opens up. As soon as I click on a
> function/method within the back trace window, DDD reports an internal
> error and wants to restart itself. Doing so twice then segfaults DDD.
> 
> DDD log attached.
> 
> The bug ist reproducible.

This looks like a memory corruption problem in the LessTif XmText
widget (similar problems have been reported before).

I'm not a big expert in LessTif internals, but at least I want to make
sure this is really the cause.  There's two ways for narrowing that
problem down:

* Set the environment variable MALLOC_CHECK_ to 2 and repeat the DDD run;
  while this will not help fixing the error, any memory corruption problems
  will be detected sooner, facilitating localization.

* You may wish to upgrade to LessTif 0.92 or later, available from
  `www.lesstif.org'; please tell me whether the problem persists.

Best wishes,

Andreas

-- 
Andreas Zeller     Universitaet Passau
                   http://www.fmi.uni-passau.de/st/staff/zeller/



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