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Operating Systems Solaris How to create core through program at the time of crash by handling signals? Post 302740833 by rajeev_ks on Friday 7th of December 2012 12:04:56 AM

Old

12-07-2012

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Quote:

Originally Posted by jim mcnamara

The simple way to get a core that "starts" at the fault is not to block signals. Obviously this has some very bad downsides.

Otherwise with what you have done you have to traverse stack frames back to the problem, in gdb this is the

Code:

backtrace

command. Signal receipt when blocked causes an immediate interrupt to the executing code, pushing the state of the process and kernel onto the interrupt stack. Working backwards can be fun.

Some example code for gaddr2line():

Note that you should consider libelf instead of the python library.

I am using dbx for debugging core and the corresponding command for backtrace is where in dbx. But as I said earlier I am getting the stack of signal handler routine through backtrace and not the location of faulty code.

rajeev_ks

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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)