ZFS hang -CURRENT (9/9/9)

[Pawel Jakub Dawidek]

On Thu, Sep 10, 2009 at 10:46:43AM -0500, James R. Van Artsdalen wrote:
> FreeBSD pygmy.housenet.jrv 9.0-CURRENT FreeBSD 9.0-CURRENT #4 r197044M:
> Wed Sep  9 18:58:08 CDT 2009    
> james at pygmy.housenet.jrv:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> ZFS recv hung last night during the daily periodic script.  Most of the
> pool can be read but if one area is touched the process hangs with ^T
> reporting:
> 
> $ find /bigtex
> ...
> /bigtex/usr/home/james
> ^T
> load: 0.00  cmd: find 2794 [rrl->rr_cv)] 5861.45r 0.28u 2.02s 0% 1704k
> 
> That's about where the ZFS recv hung:
> 
> receiving incremental stream of
> bigtex/usr/home/james/News at syssnap-1246856401 into
> bigtex/usr/home/james/News at syssnap-1246856401
> received 15.8MB stream in 59 seconds (275KB/sec)
> receiving incremental stream of
> bigtex/usr/home/james/News at syssnap-1246942803 into
> bigtex/usr/home/james/News at syssnap-1246942803
> received 5.91MB stream in 50 seconds (121KB/sec)
> receiving incremental stream of
> bigtex/usr/home/james/News at syssnap-1247029203 into
> bigtex/usr/home/james/News at syssnap-1247029203
> 
> There should have 25 or so more snapshots in that filesystem.
> 
> /var/log/messages has no messages.

Could you break into DDB debugger and send me output of 'alltrace'
command for starters. You can also obtain process backtrace using
procstat(1).

-- 
Pawel Jakub Dawidek                       http://www.wheel.pl
pjd at FreeBSD.org                           http://www.FreeBSD.org
FreeBSD committer                         Am I Evil? Yes, I Am!
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