Date: Sun, 11 Nov 2012 09:32:49 +1100 From: Peter Jeremy <peter@rulingia.com> To: freebsd-fs@freebsd.org Subject: zfs diff deadlock Message-ID: <20121110223249.GB506@server.rulingia.com>
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I recently decided to do a "zfs diff" between two snapshots to try
and identify why there was so much "USED" space in the snapshot.
The diff ran for a while (though with very little IO) but has now
wedged unkillably. There's nothing on the console or in any logs,
the pool reports no problems and there are no other visible FS
issues. Any ideas on tracking this down?
root@server:/root # ps -lp 53146
UID PID PPID CPU PRI NI VSZ RSS MWCHAN STAT TT TIME COMMAND
0 53146 53092 0 76 0 18096 948 ffffff0149cc6100 D+ 33 4:18.=
76 zfs diff -F tank/beckett/home@20121108 tank/beckett/home@20121109
root@server:/root # procstat -kk 53146
PID TID COMM TDNAME KSTACK =
=20
53146 100490 zfs - mi_switch+0x18e sleepq_wait+=
0x44 _sx_slock_hard+0x22c _sx_slock+0x7a zap_get_leaf_byblk+0xbd zap_deref_=
leaf+0x68 fzap_cursor_retrieve+0xe7 zap_cursor_retrieve+0x155 zap_value_sea=
rch+0x7f zfs_obj_to_path_impl+0x292 zfs_obj_to_stats+0x175 zfs_ioc_obj_to_s=
tats+0x7e zfsdev_ioctl+0xe6 devfs_ioctl_f+0x7a kern_ioctl+0xb6 ioctl+0xf0 a=
md64_syscall+0x109 Xfast_syscall+0xfc=20
53146 100643 zfs initial thread mi_switch+0x18e sleepq_catch=
_signals+0x247 sleepq_wait_sig+0x16 _sleep+0x2be pipe_write+0x6c8 write_rec=
ord+0x79 diff_cb+0x166 traverse_visitbp+0x21c traverse_visitbp+0x316 traver=
se_visitbp+0x316 traverse_visitbp+0x316 traverse_visitbp+0x316 traverse_vis=
itbp+0x316 traverse_visitbp+0x316 traverse_dnode+0x7c traverse_visitbp+0x48=
c traverse_impl+0x188 traverse_dataset+0x32=20
root@server:/root # zpool status tank
pool: tank
state: ONLINE
scan: resilvered 1.58G in 0h10m with 0 errors on Tue Oct 30 06:55:29 2012
config:
NAME STATE READ WRITE CKSUM
tank ONLINE 0 0 0
raidz2-0 ONLINE 0 0 0
ada2p5 ONLINE 0 0 0
ada3p5 ONLINE 0 0 0
ada1p5 ONLINE 0 0 0
ada5p5 ONLINE 0 0 0
ada0p5 ONLINE 0 0 0
ada4p5 ONLINE 0 0 0
logs
ada6p3 ONLINE 0 0 0
cache
ada6p4 ONLINE 0 0 0
errors: No known data errors
The systems is running a 4-month old 8-stable (r237444)
--=20
Peter Jeremy
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