ZFS lockup in "zfs" state

[Jeremy Chadwick]

On Wed, Feb 13, 2008 at 12:53:31PM +0100, Ivan Voras wrote:
> Jeremy Chadwick wrote:
> > On Wed, Feb 13, 2008 at 11:43:42AM +0100, Ivan Voras wrote:
> >> Hi,
> >>
> >> A machine just wedged its ZFS file systems (UFS file systems were still
> >> running), all unresponsive processes were in "zfs" state. This is
> >> 7.0-RC1 on i386 with 2 GB RAM. It has happened at least once before.
> >>
> >> I have a kernel core dump (dumped from kdb/ddb on hotkey), if anyone's
> >> interested.
> > 
> > Were you copying any data from a ZFS pool to a UFS filesystem, or
> > ZFS-to-ZFS, at that time? 
> 
> I don't know - the machine is a server that's been doing it's job (web
> server, mysql, java). Depending on when the problem started, there could
> have been a rsync from ZFS to UFS for backup purposes.
> 
> > Does your coredump's backtrace look at all
> > similar to the below report?
> > 
> > http://lists.freebsd.org/pipermail/freebsd-stable/2008-January/040047.html
> 
> I vaguely remember there being something about sockbuf when I had the
> online debugger running and java (tomcat) is definitely running on the
> server. Can you advise me how to extract this kind of information from a
> kernel core dump (kgdb doesn't have show alllocks, etc :) )?

I personally don't know.  kris@ should be able to help with this.
Volunteering people for stuff again, heh.  :-)

-- 
| 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 |