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Date:      Thu, 10 Sep 2009 10:46:43 -0500
From:      "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
To:        freebsd-fs <freebsd-fs@freebsd.org>
Cc:        Pawel Jakub Dawidek <pjd@freebsd.org>
Subject:   ZFS hang -CURRENT (9/9/9)
Message-ID:  <4AA91F63.1010801@jrv.org>

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FreeBSD pygmy.housenet.jrv 9.0-CURRENT FreeBSD 9.0-CURRENT #4 r197044M:
Wed Sep  9 18:58:08 CDT 2009    
james@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@syssnap-1246856401 into
bigtex/usr/home/james/News@syssnap-1246856401
received 15.8MB stream in 59 seconds (275KB/sec)
receiving incremental stream of
bigtex/usr/home/james/News@syssnap-1246942803 into
bigtex/usr/home/james/News@syssnap-1246942803
received 5.91MB stream in 50 seconds (121KB/sec)
receiving incremental stream of
bigtex/usr/home/james/News@syssnap-1247029203 into
bigtex/usr/home/james/News@syssnap-1247029203

There should have 25 or so more snapshots in that filesystem.

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