02-08-2002
You can get a core dump because of many things. It normally is because of environment variables not being correct. I get the following every time I forget to set my term to vt100 -
$ echo $TERM
dtterm
$ vi /etc/motd
dtterm: Unknown terminal type
[Using open mode]
Segmentation Fault(coredump)
$ ls -l core
-rw-r--r-- 1 tghunter sysadmin 562480 Feb 8 10:13 core
$ file core
core: ELF 32-bit MSB core file SPARC Version 1, from 'vi'
As you can see I tried to vi a file but my term was dtterm instead of vt100 (I was doing a telnet to another server). It dumps a core file which can be removed. Programmers will use core files to check their code when they have a problem. Most admins have a cron job to remove core files from the filesystems (but watch out, some applications have files called somethingcore - removing them causes headaches!)
Example of programmers having problems:
Calls to Performance Library routines cause segmentation faults. What could be wrong and what can I do?
You may be experiencing stack overflow in your program. There are two types of stack space that need to be addressed.
First, there is the stack space allocated to a process. This is controlled by the limit command. Try unlimiting your process stack by saying:
% unlimit stacksize
Secondly, if your program is multi-threaded each thread must have its own stack space. This is controlled by the ${STACKSIZE} environment variable. The units are in KB so saying:
% setenv STACKSIZE 4000
sets each thread's stack size to 4 MB. This is the minimum value that Performance Library requires, so make sure that ${STACKSIZE} is set to at least 4000. You may need to increase this value if your program uses large stack based variables.
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LEARN ABOUT CENTOS
abrt-action-generate-core-backtrace
ABRT-ACTION-GENERA(1) ABRT Manual ABRT-ACTION-GENERA(1)
NAME
abrt-action-generate-core-backtrace - Generates coredump-level backtrace
SYNOPSIS
abrt-action-generate-core-backtrace [-v] [-r] [-d DIR]
DESCRIPTION
This tool uses coredump from the file coredump and binary at the path stored in file executable in the problem directory to generate
coredump-level backtrace.
Coredump-level backtrace resembles ordinary backtrace in that it contains information about call frames present on the stack at the time of
the crash. However, it only contains information that can be obtained from the coredump without debugging symbols available - mainly
relative addresses of the stored instruction pointers. Such backtrace can still be useful for reporting and reproducing the bug and does
not require debugging information files to be installed.
The result is saved in the problem directory in a file named core_backtrace.
Integration with libreport events
abrt-action-generate-core-backtrace can be used as an analyzer for application crashes which dump core.
Example usage in report_event.conf:
EVENT=analyze analyzer=CCpp
abrt-action-generate-core-backtrace
OPTIONS
-d DIR
Path to problem directory.
-r
Do not hash function fingerprints. Useful for debugging.
-v
Be more verbose. Can be given multiple times.
AUTHORS
o ABRT team
abrt 2.1.11 06/18/2014 ABRT-ACTION-GENERA(1)