topic Re: core file in Operating System - Linux

core file

Chakravarthi — Wed, 08 Dec 2004 01:55:17 GMT

Hi,

core file is not getting generated in redhat 8 machine,

ulimit -a o/p is given below

core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
file size (blocks, -f) unlimited
max locked memory (kbytes, -l) unlimited
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
stack size (kbytes, -s) 8192
cpu time (seconds, -t) unlimited
max user processes (-u) 4027
virtual memory (kbytes, -v) unlimited

Re: core file

Vishwas Pai — Wed, 08 Dec 2004 04:17:42 GMT

Answer is in your question.

$ ulimit -c unlimited

Cheers -vishwas

Re: core file

Chris Xu — Wed, 08 Dec 2004 09:23:56 GMT

The system-wide setting of the core dump limit can be found in /etc/profile as below:

# No core files by default
ulimit -S -c 0 > /dev/null 2>&1

But if this is only applied to a specific user account, I would recommend only to make necessary changes in the user's profile. In addition, you would like to set some limit to core file. Making it unlimited would risk filling up your filesystem if the core file is huge or larger than the available space in the filesystem.

Chris

Re: core file

Chakravarthi — Thu, 09 Dec 2004 06:26:58 GMT

i tried ulimit -c unlimited and also commented the entry in /etc/profile, still it doesnt create the core file

Re: core file

Vishwas Pai — Thu, 09 Dec 2004 06:38:01 GMT

What is the output of ..

# sysctl -A | grep -i kernel.core

-vishwas

Re: core file

Dusan Krasa — Thu, 09 Dec 2004 08:52:54 GMT

Hi,
on the RH/Fedora distro look at /etc/security/limits.conf .

Finally edit the /etc/profile file and change the following line: ulimit -c

to read: ulimit -S -c > /dev/null 2<&1

Re: core file

Chris Xu — Thu, 09 Dec 2004 09:49:54 GMT

How did you try to create a core file? By a command or running a script?

Chris

Re: core file

Chakravarthi — Fri, 10 Dec 2004 05:43:25 GMT

[root@ripple root]# sysctl -A | grep -i kernel.core
kernel.core_uses_pid = 1

i tried creating core file by killing process by sending SIGSEGV signale

kill -11

Re: core file

Vitaly Karasik_1 — Sun, 12 Dec 2004 04:31:55 GMT

Dusan is right, you should add to

/etc/security/limits.conf

two lines

* soft core unlimited
* hard core unlimited

and edit /etc/profiles

Re: core file

Chakravarthi — Mon, 13 Dec 2004 01:11:49 GMT

do i need to restart the machine after the changes???

Re: core file

Vitaly Karasik_1 — Mon, 13 Dec 2004 02:07:54 GMT

as far as I understand, re-login and restart your process is enough

Re: core file

Chakravarthi — Thu, 10 Feb 2005 08:56:15 GMT

hi all,

i tried all the suggestions still the process is not generating the core file,

any suggestions!!