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Date: Sun, 18 Apr 2004 18:55:49 -0400
To: Sophia C Yuditskaya <scyudits AT MIT DOT EDU>, cygwin AT cygwin DOT com
From: Larry Hall <cygwin-lh AT cygwin DOT com>
Subject: Re: seg fault via cygwin1!aclcheck() ?
Cc: scyudits AT MIT DOT EDU
In-Reply-To: <1082306435.4082af8343d24@webmail.mit.edu>
References: <1082306435 DOT 4082af8343d24 AT webmail DOT mit DOT edu>
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At 12:40 PM 4/18/2004, you wrote:
>Hi,
>
>I am running ns on cygwin, and after my program executes for a while with no
>problems, suddenly I get a seg fault with the following backtrace (in gdb):
>
>Program received signal SIGSEGV, Segmetation fault.
>0x610ab27b in random () from /usr/bin/cygwin1.dll
>(gdb) backtrace
>#0 0x610ab27b in random () from /usr/bin/cygwin1.dll
>#1 0x610550c6 in localtime_r () from /usr/bin/cygwin1.dll
>#2 0x61086751 in cygwin1!aclcheck () from /usr/bin/cygwin1.dll
>...(the rest of the trace is from my ns code)
>
>What is wrong? It seems like a permissions problem, but my code is not writing
>to a file. Although my code reads from a file, this seg fault occurs after a
>great many lines have been already read from this file. Based on the back
>trace, the seg fault does not occur at a point where the file is read anyway. 
>
>How can I fix this?


Looks like you're going to have to break out the debugger.  aclcheck() 
doesn't call localtime_r() (or anything close to it) so this leads me to 
conclude that you have a stack corruption in your program somewhere.



--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
838 Washington Street                   (508) 893-9889 - FAX
Holliston, MA 01746                     


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