linux-kernel - [3.9-rc5] INFO: task umount:29671 blocked for more than 120 seconds

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Message-id: <31775765.508251364807825241.JavaMail.weblogic@epml02>
Date:	Mon, 01 Apr 2013 09:17:05 +0000 (GMT)
From:	Jongman Heo <jongman.heo@...sung.com>
To:	linux-kernel@...r.kernel.org
Subject: [3.9-rc5] INFO: task umount:29671 blocked for more than 120 seconds


Hi guys,

I hit following warning with 3.9-rc5, during unmount (the device was mounted via loop device, in case it matters).

Jongman.

[ 3600.583547] INFO: task umount:29671 blocked for more than 120 seconds.
[ 3600.583552] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3600.583555] umount          D 0000000000000001     0 29671  29632 0x00000000
[ 3600.583561]  ffff88011ecb5c98 0000000000000086 ffff880130ccade0 0000000000013e40
[ 3600.583566]  ffff88011ecb5fd8 ffff88011ecb4010 0000000000013e40 0000000000013e40
[ 3600.583571]  ffff88011ecb5fd8 0000000000013e40 ffff880132518000 ffff880130ccade0
[ 3600.583575] Call Trace:
[ 3600.583583]  [<ffffffff816fb669>] schedule+0x29/0x70
[ 3600.583589]  [<ffffffff816fb98e>] schedule_preempt_disabled+0xe/0x10
[ 3600.583593]  [<ffffffff816fa0af>] __mutex_lock_slowpath+0xdf/0x160
[ 3600.583598]  [<ffffffff811e433e>] ? release_sysfs_dirent+0x7e/0x100
[ 3600.583603]  [<ffffffff816f9fab>] mutex_lock+0x2b/0x50
[ 3600.583607]  [<ffffffff8149a8aa>] loop_clr_fd+0x24a/0x2e0
[ 3600.583612]  [<ffffffff816fce3e>] ? _raw_spin_lock+0xe/0x20
[ 3600.583617]  [<ffffffff8149a9b8>] lo_release+0x78/0x90
[ 3600.583622]  [<ffffffff811a94e4>] __blkdev_put+0x194/0x1d0
[ 3600.583628]  [<ffffffff811a957d>] blkdev_put+0x5d/0x160
[ 3600.583633]  [<ffffffff811719bd>] kill_block_super+0x4d/0x80
[ 3600.583638]  [<ffffffff81171f35>] deactivate_locked_super+0x45/0x70
[ 3600.583643]  [<ffffffff81172dda>] deactivate_super+0x4a/0x70
[ 3600.583648]  [<ffffffff8118e538>] mntput_no_expire+0xf8/0x150
[ 3600.583653]  [<ffffffff8118eded>] sys_umount+0xcd/0x3e0
[ 3600.583659]  [<ffffffff817058d9>] system_call_fastpath+0x16/0x1b
[ 3600.583663] INFO: task blkid:29673 blocked for more than 120 seconds.
[ 3600.583665] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 3600.583667] blkid           D ffffffff81807f20     0 29673      1 0x00000000
[ 3600.583672]  ffff88011338fa88 0000000000000082 ffff880130ccc4d0 0000000000013e40
[ 3600.583677]  ffff88011338ffd8 ffff88011338e010 0000000000013e40 0000000000013e40
[ 3600.583681]  ffff88011338ffd8 0000000000013e40 ffff880132b416f0 ffff880130ccc4d0
[ 3600.583686] Call Trace:
[ 3600.583691]  [<ffffffff816fb669>] schedule+0x29/0x70
[ 3600.583695]  [<ffffffff816fb98e>] schedule_preempt_disabled+0xe/0x10
[ 3600.583700]  [<ffffffff816fa0af>] __mutex_lock_slowpath+0xdf/0x160
[ 3600.583704]  [<ffffffff816f9fab>] mutex_lock+0x2b/0x50
[ 3600.583709]  [<ffffffff811a9723>] __blkdev_get+0x73/0x480
[ 3600.583714]  [<ffffffff811a9e90>] ? blkdev_get+0x360/0x360
[ 3600.583719]  [<ffffffff811a9b81>] blkdev_get+0x51/0x360
[ 3600.583724]  [<ffffffff816fce3e>] ? _raw_spin_lock+0xe/0x20
[ 3600.583729]  [<ffffffff811a9e90>] ? blkdev_get+0x360/0x360
[ 3600.583734]  [<ffffffff811a9ef2>] blkdev_open+0x62/0x80
[ 3600.583739]  [<ffffffff8116d82e>] do_dentry_open+0x23e/0x2c0
[ 3600.583743]  [<ffffffff8116d9c5>] finish_open+0x35/0x50
[ 3600.583748]  [<ffffffff8117c7b6>] do_last+0x696/0xe50
[ 3600.583752]  [<ffffffff81166984>] ? kmem_cache_alloc_trace+0xc4/0x120
[ 3600.583757]  [<ffffffff8117f7c8>] path_openat+0xb8/0x490
[ 3600.583762]  [<ffffffff8117fcd9>] do_filp_open+0x49/0xa0
[ 3600.583767]  [<ffffffff816fce3e>] ? _raw_spin_lock+0xe/0x20
[ 3600.583772]  [<ffffffff8118c4e5>] ? __alloc_fd+0xb5/0x160
[ 3600.583777]  [<ffffffff8116d498>] do_sys_open+0x108/0x1f0
[ 3600.583781]  [<ffffffff8116d5c1>] sys_open+0x21/0x30
[ 3600.583786]  [<ffffffff817058d9>] system_call_fastpath+0x16/0x1b