Date:	Fri, 28 Jan 2011 02:16:46 +0800
From:	Drunkard Zhang <gongfan193@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>, aelder@....com
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	usb-storage@...ts.one-eyed-alien.net, xfs@....sgi.com
Subject: 2.6.37: Failed to umount xfs on usb disk

I can't umount xfs on a 2TB usb disk, when this happened, I can't use
usb disk anymore, exec of command "sync" and "lsusb" hangs. Any idea?
It's an Acer 4520G laptop.

The dmesg show something like this:

[21000.265078] INFO: task khubd:409 blocked for more than 120 seconds.
[21000.265089] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21000.265097] khubd         D ffff88012c195fe0     0   409      2 0x00000000
[21000.265112]  ffff88012c30f8d8 0000000000000046 ffffffff8111112b
ffff88012c2cc530
[21000.265125]  ffff88012acd4530 ffff88012c30ffd8 ffff88012c195c40
ffff88012c195fe8
[21000.265137]  ffff88012c195fe0 ffff88012c30e000 0000000000012040
ffff88012c30ffd8
[21000.265149] Call Trace:
[21000.265169]  [<ffffffff8111112b>] ? pollwake+0x52/0x54
[21000.265185]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21000.265199]  [<ffffffff815908f7>] rwsem_down_failed_common+0xdb/0x10d
[21000.265211]  [<ffffffff81116a53>] ? wait_on_inode+0x1a/0x1c
[21000.265223]  [<ffffffff81590950>] rwsem_down_read_failed+0x12/0x14
[21000.265237]  [<ffffffff812a4e14>] call_rwsem_down_read_failed+0x14/0x30
[21000.265251]  [<ffffffff8112aac3>] ? bdev_set+0x0/0x15
[21000.265261]  [<ffffffff81104800>] ? get_super+0x64/0xbc
[21000.265271]  [<ffffffff8158ffc4>] ? down_read+0x17/0x19
[21000.265280]  [<ffffffff81104808>] get_super+0x6c/0xbc
[21000.265290]  [<ffffffff8112c372>] fsync_bdev+0x18/0x49
[21000.265304]  [<ffffffff81291ebc>] invalidate_partition+0x25/0x42
[21000.265317]  [<ffffffff81155193>] del_gendisk+0x3b/0xf6
[21000.265330]  [<ffffffff813347af>] ? device_del+0x199/0x1a1
[21000.265341]  [<ffffffff81356eff>] sd_remove+0x66/0xa2
[21000.265352]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21000.265361]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21000.265373]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21000.265383]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21000.265396]  [<ffffffff81354dfd>] __scsi_remove_device+0x52/0x9d
[21000.265407]  [<ffffffff81351fcd>] scsi_forget_host+0x46/0x68
[21000.265417]  [<ffffffff8134c162>] scsi_remove_host+0x84/0xfe
[21000.265431]  [<ffffffff813cfdb3>] quiesce_and_remove_host+0x5f/0x98
[21000.265442]  [<ffffffff813cfeb0>] usb_stor_disconnect+0x22/0x2e
[21000.265452]  [<ffffffff813b6349>] usb_unbind_interface+0x59/0x108
[21000.265462]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21000.265472]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21000.265483]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21000.265493]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21000.265506]  [<ffffffff813b3fdb>] usb_disable_device+0x50/0xf7
[21000.265517]  [<ffffffff813af5dc>] usb_disconnect+0x93/0x123
[21000.265528]  [<ffffffff813afc8d>] hub_thread+0x41b/0xdc2
[21000.265538]  [<ffffffff8103d74d>] ? dequeue_entity+0x4a/0x184
[21000.265548]  [<ffffffff8103d8fa>] ? dequeue_task_fair+0x73/0x7c
[21000.265562]  [<ffffffff8105f417>] ? autoremove_wake_function+0x0/0x39
[21000.265573]  [<ffffffff813af872>] ? hub_thread+0x0/0xdc2
[21000.265582]  [<ffffffff8105ef33>] kthread+0x82/0x8a
[21000.265594]  [<ffffffff81003a94>] kernel_thread_helper+0x4/0x10
[21000.265603]  [<ffffffff8103b3ac>] ? finish_task_switch+0x4b/0xc2
[21000.265613]  [<ffffffff815916ad>] ? restore_args+0x0/0x30
[21000.265622]  [<ffffffff8105eeb1>] ? kthread+0x0/0x8a
[21000.265631]  [<ffffffff81003a90>] ? kernel_thread_helper+0x0/0x10
[21000.265712] INFO: task umount:6045 blocked for more than 120 seconds.
[21000.265718] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21000.265725] umount        D ffff88012c15c8d0     0  6045   4589 0x00000000
[21000.265737]  ffff88007cff7c58 0000000000000086 ffff88007cff7bd8
ffffffff81a0b020
[21000.265749]  ffff880000000000 ffff88007cff7fd8 ffff88012c15c530
ffff88012c15c8d8
[21000.265761]  ffff88012c15c8d0 ffff88007cff6000 0000000000012040
ffff88007cff7fd8
[21000.265773] Call Trace:
[21000.265786]  [<ffffffff8158f67d>] schedule_timeout+0x27/0xc0
[21000.265800]  [<ffffffff810398ff>] ? get_parent_ip+0x11/0x41
[21000.265812]  [<ffffffff8125022e>] ? xfs_buf_cmp+0x0/0x22
[21000.265822]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21000.265833]  [<ffffffff815900d5>] __down_common+0xa0/0xf3
[21000.265846]  [<ffffffff81244308>] ? xfs_getsb+0x32/0x42
[21000.265856]  [<ffffffff8159019b>] __down+0x1d/0x1f
[21000.265868]  [<ffffffff81063b66>] down+0x2d/0x3f
[21000.265878]  [<ffffffff81251169>] xfs_buf_lock+0x9b/0xeb
[21000.265888]  [<ffffffff81244308>] xfs_getsb+0x32/0x42
[21000.265898]  [<ffffffff81244344>] xfs_unmountfs_writesb+0x2c/0x8e
[21000.265910]  [<ffffffff8124590b>] xfs_unmountfs+0xf9/0x128
[21000.265921]  [<ffffffff812589b0>] xfs_fs_put_super+0x46/0x73
[21000.265932]  [<ffffffff81105862>] generic_shutdown_super+0x6b/0xed
[21000.265942]  [<ffffffff8110590b>] kill_block_super+0x27/0x3f
[21000.265951]  [<ffffffff81104b75>] deactivate_locked_super+0x26/0x46
[21000.265961]  [<ffffffff8110503f>] deactivate_super+0x45/0x4a
[21000.265972]  [<ffffffff8111a1dc>] mntput_no_expire+0xe2/0x110
[21000.265982]  [<ffffffff8111a895>] sys_umount+0x2d7/0x302
[21000.265993]  [<ffffffff81590ab0>] ? trace_hardirqs_off_thunk+0x3a/0x6c
[21000.266031]  [<ffffffff81002cab>] system_call_fastpath+0x16/0x1b
[21183.240082] INFO: task khubd:409 blocked for more than 5 seconds.
[21183.240093] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21183.240101] khubd         D ffff88012c195fe0     0   409      2 0x00000000
[21183.240117]  ffff88012c30f8d8 0000000000000046 ffffffff8111112b
ffff88012c2cc530
[21183.240132]  ffff88012acd4530 ffff88012c30ffd8 ffff88012c195c40
ffff88012c195fe8
[21183.240145]  ffff88012c195fe0 ffff88012c30e000 0000000000012040
ffff88012c30ffd8
[21183.240159] Call Trace:
[21183.240180]  [<ffffffff8111112b>] ? pollwake+0x52/0x54
[21183.240197]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21183.240213]  [<ffffffff815908f7>] rwsem_down_failed_common+0xdb/0x10d
[21183.240226]  [<ffffffff81116a53>] ? wait_on_inode+0x1a/0x1c
[21183.240240]  [<ffffffff81590950>] rwsem_down_read_failed+0x12/0x14
[21183.240254]  [<ffffffff812a4e14>] call_rwsem_down_read_failed+0x14/0x30
[21183.240269]  [<ffffffff8112aac3>] ? bdev_set+0x0/0x15
[21183.240281]  [<ffffffff81104800>] ? get_super+0x64/0xbc
[21183.240291]  [<ffffffff8158ffc4>] ? down_read+0x17/0x19
[21183.240301]  [<ffffffff81104808>] get_super+0x6c/0xbc
[21183.240312]  [<ffffffff8112c372>] fsync_bdev+0x18/0x49
[21183.240327]  [<ffffffff81291ebc>] invalidate_partition+0x25/0x42
[21183.240341]  [<ffffffff81155193>] del_gendisk+0x3b/0xf6
[21183.240356]  [<ffffffff813347af>] ? device_del+0x199/0x1a1
[21183.240368]  [<ffffffff81356eff>] sd_remove+0x66/0xa2
[21183.240379]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21183.240388]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21183.240401]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21183.240412]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21183.240426]  [<ffffffff81354dfd>] __scsi_remove_device+0x52/0x9d
[21183.240438]  [<ffffffff81351fcd>] scsi_forget_host+0x46/0x68
[21183.240450]  [<ffffffff8134c162>] scsi_remove_host+0x84/0xfe
[21183.240465]  [<ffffffff813cfdb3>] quiesce_and_remove_host+0x5f/0x98
[21183.240476]  [<ffffffff813cfeb0>] usb_stor_disconnect+0x22/0x2e
[21183.240488]  [<ffffffff813b6349>] usb_unbind_interface+0x59/0x108
[21183.240498]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21183.240508]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21183.240520]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21183.240531]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21183.240545]  [<ffffffff813b3fdb>] usb_disable_device+0x50/0xf7
[21183.240558]  [<ffffffff813af5dc>] usb_disconnect+0x93/0x123
[21183.240569]  [<ffffffff813afc8d>] hub_thread+0x41b/0xdc2
[21183.240581]  [<ffffffff8103d74d>] ? dequeue_entity+0x4a/0x184
[21183.240591]  [<ffffffff8103d8fa>] ? dequeue_task_fair+0x73/0x7c
[21183.240607]  [<ffffffff8105f417>] ? autoremove_wake_function+0x0/0x39
[21183.240619]  [<ffffffff813af872>] ? hub_thread+0x0/0xdc2
[21183.240629]  [<ffffffff8105ef33>] kthread+0x82/0x8a
[21183.240641]  [<ffffffff81003a94>] kernel_thread_helper+0x4/0x10
[21183.240651]  [<ffffffff8103b3ac>] ? finish_task_switch+0x4b/0xc2
[21183.240661]  [<ffffffff815916ad>] ? restore_args+0x0/0x30
[21183.240671]  [<ffffffff8105eeb1>] ? kthread+0x0/0x8a
[21183.240680]  [<ffffffff81003a90>] ? kernel_thread_helper+0x0/0x10
[21183.240752] INFO: task umount:6045 blocked for more than 5 seconds.
[21183.240758] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21183.240765] umount        D ffff88012c15c8d0     0  6045   4589 0x00000000
[21183.240778]  ffff88007cff7c58 0000000000000086 ffff88007cff7bd8
ffffffff81a0b020
[21183.240792]  ffff880000000000 ffff88007cff7fd8 ffff88012c15c530
ffff88012c15c8d8
[21183.240806]  ffff88012c15c8d0 ffff88007cff6000 0000000000012040
ffff88007cff7fd8
[21183.240819] Call Trace:
[21183.240834]  [<ffffffff8158f67d>] schedule_timeout+0x27/0xc0
[21183.240849]  [<ffffffff810398ff>] ? get_parent_ip+0x11/0x41
[21183.240862]  [<ffffffff8125022e>] ? xfs_buf_cmp+0x0/0x22
[21183.240872]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21183.240884]  [<ffffffff815900d5>] __down_common+0xa0/0xf3
[21183.240898]  [<ffffffff81244308>] ? xfs_getsb+0x32/0x42
[21183.240909]  [<ffffffff8159019b>] __down+0x1d/0x1f
[21183.240922]  [<ffffffff81063b66>] down+0x2d/0x3f
[21183.240935]  [<ffffffff81251169>] xfs_buf_lock+0x9b/0xeb
[21183.240946]  [<ffffffff81244308>] xfs_getsb+0x32/0x42
[21183.240956]  [<ffffffff81244344>] xfs_unmountfs_writesb+0x2c/0x8e
[21183.240970]  [<ffffffff8124590b>] xfs_unmountfs+0xf9/0x128
[21183.240983]  [<ffffffff812589b0>] xfs_fs_put_super+0x46/0x73
[21183.240996]  [<ffffffff81105862>] generic_shutdown_super+0x6b/0xed
[21183.241030]  [<ffffffff8110590b>] kill_block_super+0x27/0x3f
[21183.241045]  [<ffffffff81104b75>] deactivate_locked_super+0x26/0x46
[21183.241061]  [<ffffffff8110503f>] deactivate_super+0x45/0x4a
[21183.241077]  [<ffffffff8111a1dc>] mntput_no_expire+0xe2/0x110
[21183.241093]  [<ffffffff8111a895>] sys_umount+0x2d7/0x302
[21183.241109]  [<ffffffff81590ab0>] ? trace_hardirqs_off_thunk+0x3a/0x6c
[21183.241129]  [<ffffffff81002cab>] system_call_fastpath+0x16/0x1b
[21188.241078] INFO: task khubd:409 blocked for more than 5 seconds.
[21188.241089] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21188.241097] khubd         D ffff88012c195fe0     0   409      2 0x00000000
[21188.241113]  ffff88012c30f8d8 0000000000000046 ffffffff8111112b
ffff88012c2cc530
[21188.241129]  ffff88012acd4530 ffff88012c30ffd8 ffff88012c195c40
ffff88012c195fe8
[21188.241144]  ffff88012c195fe0 ffff88012c30e000 0000000000012040
ffff88012c30ffd8
[21188.241159] Call Trace:
[21188.241180]  [<ffffffff8111112b>] ? pollwake+0x52/0x54
[21188.241198]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21188.241214]  [<ffffffff815908f7>] rwsem_down_failed_common+0xdb/0x10d
[21188.241227]  [<ffffffff81116a53>] ? wait_on_inode+0x1a/0x1c
[21188.241241]  [<ffffffff81590950>] rwsem_down_read_failed+0x12/0x14
[21188.241255]  [<ffffffff812a4e14>] call_rwsem_down_read_failed+0x14/0x30
[21188.241269]  [<ffffffff8112aac3>] ? bdev_set+0x0/0x15
[21188.241281]  [<ffffffff81104800>] ? get_super+0x64/0xbc
[21188.241292]  [<ffffffff8158ffc4>] ? down_read+0x17/0x19
[21188.241302]  [<ffffffff81104808>] get_super+0x6c/0xbc
[21188.241313]  [<ffffffff8112c372>] fsync_bdev+0x18/0x49
[21188.241328]  [<ffffffff81291ebc>] invalidate_partition+0x25/0x42
[21188.241342]  [<ffffffff81155193>] del_gendisk+0x3b/0xf6
[21188.241356]  [<ffffffff813347af>] ? device_del+0x199/0x1a1
[21188.241368]  [<ffffffff81356eff>] sd_remove+0x66/0xa2
[21188.241380]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21188.241390]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21188.241403]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21188.241415]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21188.241429]  [<ffffffff81354dfd>] __scsi_remove_device+0x52/0x9d
[21188.241441]  [<ffffffff81351fcd>] scsi_forget_host+0x46/0x68
[21188.241452]  [<ffffffff8134c162>] scsi_remove_host+0x84/0xfe
[21188.241467]  [<ffffffff813cfdb3>] quiesce_and_remove_host+0x5f/0x98
[21188.241479]  [<ffffffff813cfeb0>] usb_stor_disconnect+0x22/0x2e
[21188.241491]  [<ffffffff813b6349>] usb_unbind_interface+0x59/0x108
[21188.241503]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21188.241513]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21188.241525]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21188.241537]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21188.241552]  [<ffffffff813b3fdb>] usb_disable_device+0x50/0xf7
[21188.241564]  [<ffffffff813af5dc>] usb_disconnect+0x93/0x123
[21188.241576]  [<ffffffff813afc8d>] hub_thread+0x41b/0xdc2
[21188.241588]  [<ffffffff8103d74d>] ? dequeue_entity+0x4a/0x184
[21188.241599]  [<ffffffff8103d8fa>] ? dequeue_task_fair+0x73/0x7c
[21188.241616]  [<ffffffff8105f417>] ? autoremove_wake_function+0x0/0x39
[21188.241628]  [<ffffffff813af872>] ? hub_thread+0x0/0xdc2
[21188.241638]  [<ffffffff8105ef33>] kthread+0x82/0x8a
[21188.241651]  [<ffffffff81003a94>] kernel_thread_helper+0x4/0x10
[21188.241662]  [<ffffffff8103b3ac>] ? finish_task_switch+0x4b/0xc2
[21188.241672]  [<ffffffff815916ad>] ? restore_args+0x0/0x30
[21188.241683]  [<ffffffff8105eeb1>] ? kthread+0x0/0x8a
[21188.241693]  [<ffffffff81003a90>] ? kernel_thread_helper+0x0/0x10
[21188.241766] INFO: task umount:6045 blocked for more than 5 seconds.
[21188.241773] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21188.241780] umount        D ffff88012c15c8d0     0  6045   4589 0x00000000
[21188.241794]  ffff88007cff7c58 0000000000000086 ffff88007cff7bd8
ffffffff81a0b020
[21188.241809]  ffff880000000000 ffff88007cff7fd8 ffff88012c15c530
ffff88012c15c8d8
[21188.241824]  ffff88012c15c8d0 ffff88007cff6000 0000000000012040
ffff88007cff7fd8
[21188.241838] Call Trace:
[21188.241854]  [<ffffffff8158f67d>] schedule_timeout+0x27/0xc0
[21188.241869]  [<ffffffff810398ff>] ? get_parent_ip+0x11/0x41
[21188.241881]  [<ffffffff8125022e>] ? xfs_buf_cmp+0x0/0x22
[21188.241892]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21188.241905]  [<ffffffff815900d5>] __down_common+0xa0/0xf3
[21188.241919]  [<ffffffff81244308>] ? xfs_getsb+0x32/0x42
[21188.241931]  [<ffffffff8159019b>] __down+0x1d/0x1f
[21188.241943]  [<ffffffff81063b66>] down+0x2d/0x3f
[21188.241955]  [<ffffffff81251169>] xfs_buf_lock+0x9b/0xeb
[21188.241966]  [<ffffffff81244308>] xfs_getsb+0x32/0x42
[21188.241979]  [<ffffffff81244344>] xfs_unmountfs_writesb+0x2c/0x8e
[21188.241993]  [<ffffffff8124590b>] xfs_unmountfs+0xf9/0x128
[21188.242031]  [<ffffffff812589b0>] xfs_fs_put_super+0x46/0x73
[21188.242046]  [<ffffffff81105862>] generic_shutdown_super+0x6b/0xed
[21188.242062]  [<ffffffff8110590b>] kill_block_super+0x27/0x3f
[21188.242078]  [<ffffffff81104b75>] deactivate_locked_super+0x26/0x46
[21188.242094]  [<ffffffff8110503f>] deactivate_super+0x45/0x4a
[21188.242111]  [<ffffffff8111a1dc>] mntput_no_expire+0xe2/0x110
[21188.242127]  [<ffffffff8111a895>] sys_umount+0x2d7/0x302
[21188.242144]  [<ffffffff81590ab0>] ? trace_hardirqs_off_thunk+0x3a/0x6c
[21188.242166]  [<ffffffff81002cab>] system_call_fastpath+0x16/0x1b
[21188.242184] INFO: task sync:6206 blocked for more than 5 seconds.
[21188.242194] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21188.242206] sync          D ffff880110b65fe0     0  6206   6070 0x00000000
[21188.242228]  ffff88009c443e40 0000000000000082 ffff88009c443e78
ffffffff81a0b020
[21188.242252]  ffffffff00000000 ffff88009c443fd8 ffff880110b65c40
ffff880110b65fe8
[21188.242277]  ffff880110b65fe0 ffff88009c442000 0000000000012040
ffff88009c443fd8
[21188.242301] Call Trace:
[21188.242319]  [<ffffffff8112482b>] ? sync_one_sb+0x0/0x22
[21188.242336]  [<ffffffff815908f7>] rwsem_down_failed_common+0xdb/0x10d
[21188.242355]  [<ffffffff810bc26e>] ? __filemap_fdatawrite_range+0x50/0x52
[21188.242373]  [<ffffffff81590950>] rwsem_down_read_failed+0x12/0x14
[21188.242390]  [<ffffffff812a4e14>] call_rwsem_down_read_failed+0x14/0x30
[21188.242406]  [<ffffffff811048b2>] ? iterate_supers+0x5a/0xcd
[21188.242422]  [<ffffffff8158ffc4>] ? down_read+0x17/0x19
[21188.242437]  [<ffffffff811048ba>] iterate_supers+0x62/0xcd
[21188.242452]  [<ffffffff8112487c>] sys_sync+0x2f/0x5c
[21188.242469]  [<ffffffff81002cab>] system_call_fastpath+0x16/0x1b
[21193.242150] INFO: task khubd:409 blocked for more than 5 seconds.
[21193.242160] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[21193.242168] khubd         D ffff88012c195fe0     0   409      2 0x00000000
[21193.242182]  ffff88012c30f8d8 0000000000000046 ffffffff8111112b
ffff88012c2cc530
[21193.242196]  ffff88012acd4530 ffff88012c30ffd8 ffff88012c195c40
ffff88012c195fe8
[21193.242208]  ffff88012c195fe0 ffff88012c30e000 0000000000012040
ffff88012c30ffd8
[21193.242220] Call Trace:
[21193.242242]  [<ffffffff8111112b>] ? pollwake+0x52/0x54
[21193.242257]  [<ffffffff815942ed>] ? sub_preempt_count+0x3a/0x4e
[21193.242272]  [<ffffffff815908f7>] rwsem_down_failed_common+0xdb/0x10d
[21193.242284]  [<ffffffff81116a53>] ? wait_on_inode+0x1a/0x1c
[21193.242296]  [<ffffffff81590950>] rwsem_down_read_failed+0x12/0x14
[21193.242310]  [<ffffffff812a4e14>] call_rwsem_down_read_failed+0x14/0x30
[21193.242323]  [<ffffffff8112aac3>] ? bdev_set+0x0/0x15
[21193.242333]  [<ffffffff81104800>] ? get_super+0x64/0xbc
[21193.242343]  [<ffffffff8158ffc4>] ? down_read+0x17/0x19
[21193.242352]  [<ffffffff81104808>] get_super+0x6c/0xbc
[21193.242363]  [<ffffffff8112c372>] fsync_bdev+0x18/0x49
[21193.242376]  [<ffffffff81291ebc>] invalidate_partition+0x25/0x42
[21193.242390]  [<ffffffff81155193>] del_gendisk+0x3b/0xf6
[21193.242403]  [<ffffffff813347af>] ? device_del+0x199/0x1a1
[21193.242414]  [<ffffffff81356eff>] sd_remove+0x66/0xa2
[21193.242425]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21193.242434]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21193.242446]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21193.242456]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21193.242469]  [<ffffffff81354dfd>] __scsi_remove_device+0x52/0x9d
[21193.242480]  [<ffffffff81351fcd>] scsi_forget_host+0x46/0x68
[21193.242490]  [<ffffffff8134c162>] scsi_remove_host+0x84/0xfe
[21193.242504]  [<ffffffff813cfdb3>] quiesce_and_remove_host+0x5f/0x98
[21193.242515]  [<ffffffff813cfeb0>] usb_stor_disconnect+0x22/0x2e
[21193.242525]  [<ffffffff813b6349>] usb_unbind_interface+0x59/0x108
[21193.242535]  [<ffffffff81337057>] __device_release_driver+0x7b/0xd1
[21193.242545]  [<ffffffff81337185>] device_release_driver+0x23/0x30
[21193.242556]  [<ffffffff81336451>] bus_remove_device+0xad/0xc2
[21193.242567]  [<ffffffff8133474b>] device_del+0x135/0x1a1
[21193.242580]  [<ffffffff813b3fdb>] usb_disable_device+0x50/0xf7
[21193.242590]  [<ffffffff813af5dc>] usb_disconnect+0x93/0x123
[21193.242601]  [<ffffffff813afc8d>] hub_thread+0x41b/0xdc2
[21193.242612]  [<ffffffff8103d74d>] ? dequeue_entity+0x4a/0x184
[21193.242622]  [<ffffffff8103d8fa>] ? dequeue_task_fair+0x73/0x7c
[21193.242636]  [<ffffffff8105f417>] ? autoremove_wake_function+0x0/0x39
[21193.242647]  [<ffffffff813af872>] ? hub_thread+0x0/0xdc2
[21193.242656]  [<ffffffff8105ef33>] kthread+0x82/0x8a
[21193.242667]  [<ffffffff81003a94>] kernel_thread_helper+0x4/0x10
[21193.242677]  [<ffffffff8103b3ac>] ? finish_task_switch+0x4b/0xc2
[21193.242686]  [<ffffffff815916ad>] ? restore_args+0x0/0x30
[21193.242695]  [<ffffffff8105eeb1>] ? kthread+0x0/0x8a
[21193.242704]  [<ffffffff81003a90>] ? kernel_thread_helper+0x0/0x10

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