ZFS hangs very often

Ulrich Spoerlein uspoerlein at gmail.com
Mon Apr 7 08:52:01 UTC 2008

On Mon, 31.03.2008 at 05:15:14 +0000, Attila Nagy wrote:
> On 2008.03.31. 15:57, Attila Nagy wrote:
> > My system completely locks up, I can't start new processes, but 
> > runnings ones -which don't do IO- can continue (for example a top).
> > I don't know ZFS internals (BTW, /usr and others are of course 
> > different ZFS filesystems on the pool), but it might be, that 
> > something major gets locked and that's why it stops here.
> >
> > Anyways, if somebody can help to back this out, I'm here to try 
> > patches, or do experiments.
> I forgot to tell -I don't know, maybe it's important-, that I have an 
> SMP box (but tried with UP kernel, the effect is the same) and 
> compression is enabled on every filesystems.


I had frequent deadlocks as you just describe when using GMIRROR on SMP
systems and running with PREEMPTION.

Could you try a kernel without PREEMPTION? Or perhaps break the GMIRRORs
for testing purposes?

Ulrich Spoerlein
It is better to remain silent and be thought a fool,
than to speak, and remove all doubt.

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