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Full Discussion: Using gdb, ignore beginning segmentation fault until reproduce environment segmentation fault
Top Forums Programming Using gdb, ignore beginning segmentation fault until reproduce environment segmentation fault Post 302714765 by DGPickett on Friday 12th of October 2012 03:05:21 PM
Old 10-12-2012
Watchdog scripts should move the core file before restarting. I like compressing it into a file with the date-time in another directory, perhaps /tmp so they get cleaned up if they get too large.

Beyond that, I like to scan for core on prod and dev boxes, ls -l it, copy it to /tmp/core.YYYY-MMDD-HHMMSS so it is not overwritten, automatically locate the main code using 'file' and common PATHs, run gdb for a stack trace (where), sending an email to the group with as much info as I could get, so they know one side effect of their activities is this core dump, which might be missed otherwise. Then I compress it in the background and sleep a second to ensure unique naming. A marker file keeps track of my last scan time, so I do not pick up the same files over and over.

But then, I am more into diagnosis by post mortem than running in debug mode. I am not sure what the environment has to do the the SEGV, that is usually a programmer with too much trust of his inputs.
 

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LEARN ABOUT CENTOS

gcore

GCORE(1)						       GNU Development Tools							  GCORE(1)

NAME

       gcore - Generate a core file of a running program

SYNOPSIS

       gcore [-o filename] pid

DESCRIPTION

       Generate a core dump of a running program with process ID pid.  Produced file is equivalent to a kernel produced core file as if the
       process crashed (and if "ulimit -c" were used to set up an appropriate core dump limit).  Unlike after a crash, after gcore the program
       remains running without any change.

OPTIONS

       -o filename
	   The optional argument filename specifies the file name where to put the core dump.  If not specified, the file name defaults to
	   core.pid, where pid is the running program process ID.

SEE ALSO

       The full documentation for GDB is maintained as a Texinfo manual.  If the "info" and "gdb" programs and GDB's Texinfo documentation are
       properly installed at your site, the command

	       info gdb

       should give you access to the complete manual.

       Using GDB: A Guide to the GNU Source-Level Debugger, Richard M. Stallman and Roland H. Pesch, July 1991.

COPYRIGHT

       Copyright (c) 1988-2013 Free Software Foundation, Inc.

       Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or
       any later version published by the Free Software Foundation; with the Invariant Sections being "Free Software" and "Free Software Needs
       Free Documentation", with the Front-Cover Texts being "A GNU Manual," and with the Back-Cover Texts as in (a) below.

       (a) The FSF's Back-Cover Text is: "You are free to copy and modify this GNU Manual.  Buying copies from GNU Press supports the FSF in
       developing GNU and promoting software freedom."

gdb-Red Hat Enterprise Linux 7.6.1-51.el7			    2014-06-10								  GCORE(1)
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