Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Reply-To: Cygwin List Message-Id: <6.1.0.6.0.20040418185329.02fbc7c8@127.0.0.1> X-Sender: Date: Sun, 18 Apr 2004 18:55:49 -0400 To: Sophia C Yuditskaya , cygwin@cygwin.com From: Larry Hall Subject: Re: seg fault via cygwin1!aclcheck() ? Cc: scyudits@MIT.EDU In-Reply-To: <1082306435.4082af8343d24@webmail.mit.edu> References: <1082306435.4082af8343d24@webmail.mit.edu> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" 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 -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/