Locked up processes after upgrade to ZFS v15

[Jeremy Chadwick]

On Mon, Oct 11, 2010 at 10:40:11AM -0500, Sam Fourman Jr. wrote:
> > Jeremy,
> >
> > were are in a process of debugging this issue with Kai and I think that we are
> > onto something.  I would like to ask you for some additional testing.
> >
> > What kind of workload do your run?
> > Do you have anything using sendfile(2)?  E.g. Apache with EnableSendfile enabled
> > (it might be by default, without explicit options).
> > Can you try to disable sendfile(2) use, reboot and see how system behaves?
> >
> > If you still experience the same problem after doing the above, then I'd like to
> > ask you for shell access with root privileges; or establishing communication via
> > IM and running some commands for me.
> >
> > Thank you!
> > --
> > Andriy Gapon
> > _______________________________________________
> 
> 
> Andriy,
> 
> I am not sure if this is the same issue, but
> I have a similar problem running FreeBSD 9-CURRENT amd64 (sources as
> of 1 hour ago)
> a zfs lockup appears very frequently, it is a NFS server it locks up
> several times per day.
> 
> I have been having these issues since before the ZFSv15 patch was
> committed to HEAD a few months ago.
> let me know if you need details, I have no problems giving you root
> ssh on this machine... but it does  not have a serial port.
> so I am not sure how useful it would be.

Are the processes which livelock (get stuck and cannot be killed, even
with kill -9) stuck in states "zfs" or "zfsmrb"?  You can check with "ps
-axl" or top.

If so, it's probably the same problem.  If not, it may be a different
problem.

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |