/var/log/messages doesn't have crash info when kernel gets panic/oops/crash
Eric W. Biederman
ebiederm at xmission.com
Tue Jun 16 02:19:37 EDT 2009
Dharmosoth Seetharam <dseetharam at inbox.com> writes:
> I have experimented few things and results are below.
> Case 1) echo 0 > /proc/sys/kernel/panic_on_oops
> When BUG/oops occurred it is able to log the diagnostics to /var/log/messages
> and then continue(not switching to dump-saving kernel).
> What I am looking is - I want both the things to be happen.
> that is - it should log the appropriate messages in /var/log/messsages and
> should be able to take kernel dump.
You can't have it. Sorry.
Keeping user space alive is something that simply can not be done reliably.
> Please advice me, What we can do to achieve those things.
The only scenario I see possible is to take the dump. Use
makedumpfile or the crash log command to extract the kernel messages
and put them in the /var/log/messages.
More information about the kexec