Re: ftp server crashes on heavy load: possible scheduler bug

[Paulo Marques <pmarques@grupopie.com>]

Pedro Venda (SYSADM) wrote:
> On Friday 29 April 2005 13:08, Andrew Morton wrote:
> 
>>"Pedro Venda (SYSADM)" <pjvenda@rnl.ist.utl.pt> wrote:
>>
>>>We've made some changes on our ftp server, and since that it's been
>>>crashing frequently (everyday) with a kernel panic.
>>>
>>>[...]
>>> The netconsole log was surprising - "kernel BUG at kernel/sched.c:2634!"
>>
>>Strange.  It'd be interesting to try disabling CONFIG_4KSTACKS.  Also,
>>please add this to get a bit more info.
> 
> hi,
> 
> I'll try that. Should I do it with or without preemption?

The CONFIG_4KSTACKS is a more likely suspect than the preemption, actually.

When I read the post from Andrew I remembered some discussion about this 
and reiserfs, and searched my archives for it:

http://marc.theaimsgroup.com/?l=linux-kernel&m=108680778325490&w=2

I would start with turning them both off to have a stable working system.

If after that you feel that your life is too boring and you want to live 
dangerously, you might try with CONFIG_PREEMPT=y. If you really want the 
full adrenaline rush, then go wild with CONFIG_PREEMPT_BKL=y too :)

-- 
Paulo Marques - www.grupopie.com

All that is necessary for the triumph of evil is that good men do nothing.
Edmund Burke (1729 - 1797)