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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: autossh crash with 20050314 and earlier cygwin1.dll
Date: Wed, 16 Mar 2005 15:57:55 -0000
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In-Reply-To: <NUTMEGr7DywDDYBXap800000033@NUTMEG.CAM.ARTIMI.COM>
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X-OriginalArrivalTime: 16 Mar 2005 15:57:34.0810 (UTC) FILETIME=[DE7043A0:01C52A40]

----Original Message----
>From: David Rothenberger
>Sent: 16 March 2005 04:20

> Andrew. It has crashed twice in the few weeks and I've captured stack
> traces for each. I was running a debugging copy of the Cygwin DLL (built
> myself from CVS) in each case and I've run addr2line on each stack
> trace. The second stack trace was running the DLL build from CVS at
> 20050314 19:52:25 PDT. I don't have the date of the DDL for the first
> stack trace, but it was an earlier one.


0065E938  61093A1F  (6112B460, 7974742F, 61120031, 6974616D)
malloc.cc:3952
	  nextchunk = chunk_at_offset(p, size);
	  nextsize = chunksize(nextchunk);


  yeesh.  nasty heap corruption leading to bad nextchunk pointer and an
exception when it is dereferenced in the attempt to find nextsize.
happening in a realloc call.  ugly.  it's going to be hard to track down;
whatever is causing the corruption may be taking place an arbitrary amount
of time prior to when the exception happens, and not necessarily in the same
thread either.



    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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