Re: NFS server problems (lockup) on netbsd-5

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Apr 26, 2011 at 06:31:19PM +0200, Manuel Bouyer wrote:
> Hello,
> I tried upgrading a NFS server to today's netbsd-5 branch, without success.
> The previous kernel (netbsd-5 from 7 feb 2010) is rock solid.
> I tried a kernel from before the recent nfs-related pullups, it shows
> the same symptoms.
> 
> After a few hours of operation, the network stack is locked up.
> The server doesn't reply to ping, but the console is still alive and
> I can log in (it doesn't always make it to the shell though).
> ps from ddb shows lots of processes waiting on tstile, the lock seems to
> be the softnet_lock. One of the nfsd thread is waiting on livelock, I suspect
> it's also trying to get the softnet_lock but with a tryenter/kpause.
> 
> unfortunably I don't have a core dump (I couldn't get one).

And unfortunably it's not reproductible with a simple testbed (I've been
trying for 3 days).
I wonder if it could be related to the INRENAME change that has
been pulled up ...

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--