XFS lockup on 2.6.12-1.1376_FC3smp

[Joakim Tysseng <joakim.tysseng@opoint.com>]

Hi,

I'm experiencing a serious problem with XFS on 2.6.12-1.1376_FC3smp

The filesystem locks up (no write possible, mysql won't shut down, 
impossible to reboot machine from console) while running MySQL under a 
high load. The only error messages I can find are:

thales kernel: allocation failed: out of vmalloc space - use 
vmalloc=<size> to increase size.
thales kernel: XFS: possible memory allocation deadlock in kmem_alloc 
(mode:0x250

I've tried increasing /proc/sys/vm/min_free_kbytes to 16386 without success.

Any ideas? Where should I start looking, what logs, programs/tests can i 
run?

The problem does not appear immediately, the shortest time from reboot 
to failure has been 4 hours.

Machine config:
Dell 6650 / 4 x P4 Xeon with 12GB ram.
1.5T SCSI disk array / PW220S / Perc 4/DC
running XFS on top of LVM.
--
Sincerely,
Joakim Tysseng