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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 MOJAVE

jstack

jstack(1)						      General Commands Manual							 jstack(1)

NAME

       jstack - stack trace

SYNOPSIS

       jstack [ option ] pid
       jstack [ option ] executable core
       jstack [ option ] [server-id@]remote-hostname-or-IP

DESCRIPTION

       jstack  prints  Java  stack traces of Java threads for a given Java process or core file or a remote debug server. For each Java frame, the
       full class name, method name, 'bci' (byte code index) and line number, if available, are printed. With the -m option,  jstack  prints  both
       Java  and  native frames of all threads along with the 'pc' (program counter). For each native frame, the closest native symbol to 'pc', if
       available, is printed. C++ mangled names are not demangled. To demangle C++ names, the output of this command may be piped to c++filt.

       NOTE - This utility is unsupported and may or may not be available in future versions of the J2SE SDK.  jstack is not  currently  available
       on Windows platforms or on the Linux Itanium platform.

PARAMETERS

       Options are mutually exclusive. Option, if used, should follow immediately after the command name.

       pid	      process  id  for which the stacktrace is to be printed.  The process must be a Java process. To get a list of Java processes
		      running on a machine, jps may be used.

       executable     Java executable from which the core dump was produced.

       core	      core file for which the stack trace is to be printed.

       remote-hostname-or-IP
		      remote debug server's (see jsadebugd) hostname or IP address.

       server-id      optional unique id, if multiple debug servers are running on the same remote host.

OPTIONS

       -m	      prints mixed mode (both Java and native C/C++ frames) stack trace.

       -h	      Prints a help message.

       -help	      Prints a help message.

SEE ALSO

       pstack(1) c++filt(1) jps(1) jsadebugd(1)

KNOWN BUGS

       Mixed mode stack trace, the -m option, does not work with the remote debug server.

								   13 June 2004 							 jstack(1)
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