On Thu, 22 Mar 2007, Jasmin Buchert wrote:
> I tried to benchmark some Linux filesystems but the kernel crashed when
> doing lots of mkdir's on a JFS filesystem.
> I did this on kernel 2.6.21-rc4-git1, so I'm not sure it's a JFS
> problem. The mkdir's were done in parallel by 2 forks.

Hm, no crash here:

Linux foobar-g4 2.6.21-rc4-git6 #4 PREEMPT Thu Mar 22 16:34:09 GMT 2007 
ppc GNU/Linux

...with 4 mkdirs in parallel.

from your dmesg:

> ------------[ cut here ]------------
> kernel BUG at mm/rmap.c:596!

If it's reproducible, have you sent this to lkml yet?

> invalid opcode: 0000 [1] PREEMPT
> Pid: 3596, comm: mkdir Tainted: G    B  2.6.21-rc4-git1 #2

Have you tried with an untainted kernel yet? (see 
Documentation/oops-tracing.txt).

C.
-- 
BOFH excuse #246:

It must have been the lightning storm we had (yesterday) (last week) (last 
month)

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