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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..
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GZEXE(1)						      General Commands Manual							  GZEXE(1)

NAME
gzexe - compress executable files in place SYNOPSIS
gzexe name ... DESCRIPTION
The gzexe utility allows you to compress executables in place and have them automatically uncompress and execute when you run them (at a penalty in performance). For example if you execute ``gzexe /usr/bin/gdb'' it will create the following two files: -rwxr-xr-x 1 root root 1026675 Jun 7 13:53 /usr/bin/gdb -rwxr-xr-x 1 root root 2304524 May 30 13:02 /usr/bin/gdb~ /usr/bin/gdb~ is the original file and /usr/bin/gdb is the self-uncompressing executable file. You can remove /usr/bin/gdb~ once you are sure that /usr/bin/gdb works properly. This utility is most useful on systems with very small disks. OPTIONS
-d Decompress the given executables instead of compressing them. SEE ALSO
gzip(1), znew(1), zmore(1), zcmp(1), zforce(1) CAVEATS
The compressed executable is a shell script. This may create some security holes. In particular, the compressed executable relies on the PATH environment variable to find gzip and some standard utilities (basename, chmod, ln, mkdir, mktemp, rm, sleep, and tail). BUGS
gzexe attempts to retain the original file attributes on the compressed executable, but you may have to fix them manually in some cases, using chmod or chown. GZEXE(1)
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