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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 302714841 by jim mcnamara on Saturday 13th of October 2012 12:18:34 AM
Old 10-13-2012
You cannot debug kernel code from gdb. You have to use a kernel debugger.

I would suggest that you are probably corrupting the kernel with repeated segfaults.

You probably are not aware, but originally UNIX would panic (crash with a core dump) when any process had a segfault. UNIX is not meant to have bad code violate memory time after time after time. That said, I kinda doubt it is a bug in the true sense of the word.

Your code is acting more like a virus.

What does the system log say about errors? Do you get a core when the system crashes? You probably did get a system dump. You can analyze that system core.

What OS do you have?

You do understand that what I am about to say will let you do what you ask but it may trash your OS eventually:
Block (ignore) the SIGSEGV signal and set up the signal handler to reset the ignore. Then let your code run over and over the bad code until the system dies. Be sure to turn on a full system dump. Some OSes let you turn off system core dumps. You want it on. That may take a lot of GB of disk space. Then go after your bug in the kernel with the correct tool.

I do not know your OS so I cannot give you a better answer.
Last edited by jim mcnamara; 10-13-2012 at 01:30 AM..
This User Gave Thanks to jim mcnamara For This Post:
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LEARN ABOUT OSF1

crashdc

crashdc(8)						      System Manager's Manual							crashdc(8)

NAME

       crashdc - Diagnostic data collection for a running or crashed system

SYNOPSIS

       /usr/bin/crashdc [system-kernel] [core-image]

DESCRIPTION

       The  crashdc  utility  examines	the core image of the operating system to extract critical diagnostic data. This utility is a shell script
       that invokes several tools and commands that extract selected parameters of a running or a crashed system (for example,	system	configura-
       tion, running processes, and panic messages).

       The  arguments  to the crashdc utility are the system kernel and the core image. The default values are /vmunix and /dev/mem, respectively.
       If you specify no arguments, the crashdc utility examines the running system.

       The system usually invokes the crashdc utility during system startup. If the most recent core dump has been saved by the savecore  command,
       both  the  core image and the system kernel (respectively vmcore.n and vmunix.n, where the variable n is the crash number) are saved in the
       crash directory (by default, /var/adm/crash). Also, the crashdc utility saves the output as the file crash-data.n (where the variable n	is
       the  crash number) in the crash directory. The crashdc utility is invoked only if crash-data.n output in the crash directory does not exist
       or is not from the most recent crash.

FILES

       Default core image Default system image Output from crashdc

SEE ALSO

       Commands: dbx(1), kdbx(8), savecore(8)

																	crashdc(8)
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