Hi Paul,

On Fri, 2008-12-19 at 09:45 -0500, Paul L wrote:
> Ok, I managed to capture the crash, this time it happened when I was
> in console not X. So the screen grab may tell some useful info, just
> pardon my bad camera skills :P
> 
> A photo is attached.

Thanks for the photo.

According to the screen dump, a preemption counter which is used 
to kernel interrupt handlings, seems to be unexpectedly raised
by something and kunmap() kernel function called by nilfs
unfortunately detected it.

Though I'm looking at the functions which appear in the stack dump, 
there is a possibility that this was caused by some problem of the
2.6.28-rc4 kernel.

To separate suspicious kernel functions,
could you try turning off CONFIG_PREEMPT option?

I've tested the same kernel (i.e. linux-2.6.28-rc4) with your config,
but not yet succeeded to reproduce your problem.

With regards,
Ryusuke


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