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Full Discussion: Using gdb to detect segmentation fault in sh?
Top Forums UNIX for Dummies Questions & Answers Using gdb to detect segmentation fault in sh? Post 302932591 by DGPickett on Thursday 22nd of January 2015 04:07:41 PM
Old 01-22-2015
Well, 'core' is a real file, somewhere, and it has to be produced (by allowing configuration) and properly pathed for gdb to open it. The dying process puts it in $PWD/core. Once gdb is up, 'where' will get you down to a subroutine. Of course, you need source and it helps if the compile options and lack of stripping make the crashing object easy to debug. Sometiems fate is cruel, and it only bombs if you compile it without symbols! There is also running it under truss/tusc/strace to get some idea of what calls preceded the crash.
 

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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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