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[regression 3.11-rc1] unmount hanging purging quotas

To: xfs@xxxxxxxxxxx
Subject: [regression 3.11-rc1] unmount hanging purging quotas
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 18 Jul 2013 21:09:31 +1000
Cc: Chandra Seetharaman <sekharan@xxxxxxxxxx>
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mutt/1.5.21 (2010-09-15)
Hi Chandra,

I'm seeing xfs/050 hanging on a current oss-xfs master tree during
unmount getting stuck purging dquots. it basically loops there
forever. Have you seen anything like this recently?

# echo w > /proc/sysrq-trigger 
[ 5179.063824] SysRq : Show Blocked State
[ 5179.064895]   task                        PC stack   pid father
[ 5179.066459] umount          D ffff88007fd13280  5592 27782  26800 0x00000000
[ 5179.067478]  ffff88007b747b98 0000000000000046 ffff8800524e4500 
ffff88007b747fd8
[ 5179.067478]  ffff88007b747fd8 ffff88007b747fd8 ffff88007c83dc00 
ffff8800524e4500
[ 5179.067478]  ffff88007b747b88 ffff88007b747bd0 ffff88007c858000 
0000000100129cb6
[ 5179.067478] Call Trace:
[ 5179.067478]  [<ffffffff81c53319>] schedule+0x29/0x70
[ 5179.067478]  [<ffffffff81c4fa3b>] schedule_timeout+0x10b/0x1f0
[ 5179.067478]  [<ffffffff8109a1e0>] ? usleep_range+0x50/0x50
[ 5179.067478]  [<ffffffff814d8c20>] ? xfs_qm_need_dqattach+0x80/0x80
[ 5179.067478]  [<ffffffff81c4fb3e>] schedule_timeout_uninterruptible+0x1e/0x20
[ 5179.067478]  [<ffffffff814d911b>] xfs_qm_dquot_walk+0x19b/0x1b0
[ 5179.067478]  [<ffffffff81c54934>] ? _raw_spin_lock_irqsave+0x24/0x30
[ 5179.067478]  [<ffffffff8174c3ad>] ? do_raw_spin_unlock+0x5d/0xb0
[ 5179.067478]  [<ffffffff810a77e4>] ? flush_work+0x34/0x160
[ 5179.067478]  [<ffffffff8109b354>] ? del_timer+0x54/0x70
[ 5179.067478]  [<ffffffff810a9461>] ? try_to_grab_pending+0xd1/0x190
[ 5179.067478]  [<ffffffff814d9170>] xfs_qm_dqpurge_all+0x40/0x90
[ 5179.067478]  [<ffffffff814d9d65>] xfs_qm_unmount+0x25/0x40
[ 5179.067478]  [<ffffffff8147065c>] xfs_unmountfs+0x7c/0x120
[ 5179.067478]  [<ffffffff814735c5>] xfs_fs_put_super+0x25/0x60
[ 5179.067478]  [<ffffffff81191aa1>] generic_shutdown_super+0x61/0xf0
[ 5179.067478]  [<ffffffff81191b60>] kill_block_super+0x30/0x80
[ 5179.067478]  [<ffffffff81191fdd>] deactivate_locked_super+0x4d/0x80
[ 5179.067478]  [<ffffffff81192b8e>] deactivate_super+0x4e/0x70
[ 5179.067478]  [<ffffffff811adaf1>] mntput_no_expire+0x101/0x160
[ 5179.067478]  [<ffffffff811aec9c>] SyS_umount+0x9c/0x3a0
[ 5179.067478]  [<ffffffff81c5d419>] system_call_fastpath+0x16/0x1b

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx

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