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Date: Wed, 27 May 2009 10:47:54 -0400
From: Theodore Tso <tytso@....edu>
To: Jens Axboe <jens.axboe@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
chris.mason@...cle.com, david@...morbit.com, hch@...radead.org,
akpm@...ux-foundation.org, jack@...e.cz,
yanmin_zhang@...ux.intel.com, richard@....demon.co.uk,
damien.wyart@...e.fr
Subject: Re: [PATCH 0/11] Per-bdi writeback flusher threads v8
Hi Jens,
FYI, just for yucks I tried to merge your bdi patches and the ext4
patch queue to make sure there were no patch conflicts, and started a
quick regression run. I got the following soft lockup report when
running "fsstress -d /mnt/tmp -s 12345 -S -p 20 -n 1000".
I'll retry the test with your stock writeback-v8 git branch w/o any
ext4 patches planned the next mere window mainline to see if I get the
same soft lockup, but I thought I should give you an early heads up.
- Ted
[46283.324099] kjournald2 starting: pid 23258, dev dm-4:8, commit interval 5 seconds
[46283.326503] EXT4 FS on dm-4, internal journal on dm-4:8
[46283.326523] EXT4-fs: delayed allocation enabled
[46283.326538] EXT4-fs: file extents enabled
[46283.336368] EXT4-fs: mballoc enabled
[46283.337053] EXT4-fs: mounted filesystem dm-4 with ordered data mode
[46440.889702] INFO: task umount:22890 blocked for more than 120 seconds.
[46440.889715] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46440.889725] umount D 00002a0d 2288 22890 19517
[46440.889742] df5b0db8 00000046 d8a93c7f 00002a0d c0be7148 c0e5cbc8 c0163ebd c0a78700
[46440.889770] c0a78700 df5b0d74 c0164e28 f145a980 f145abfc c2d13700 00000000 d8ad1b4f
[46440.889797] 00002a0d c0165031 00000006 f145a980 c05e9dd4 00000002 df5b0d9c f145abfc
[46440.889823] Call Trace:
[46440.889844] [<c0163ebd>] ? lock_release_holdtime+0x30/0x131
[46440.889856] [<c0164e28>] ? mark_lock+0x1e/0x1e4
[46440.889868] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46440.889882] [<c05e9dd4>] ? _spin_unlock_irqrestore+0x3c/0x48
[46440.889894] [<c01652ba>] ? trace_hardirqs_on+0xb/0xd
[46440.889909] [<c05e823f>] schedule+0x8/0x17
[46440.889922] [<c01d7031>] bdi_sched_wait+0x8/0xc
[46440.889933] [<c05e8728>] __wait_on_bit+0x36/0x5d
[46440.889944] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46440.889956] [<c05e87fa>] out_of_line_wait_on_bit+0xab/0xb3
[46440.889968] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46440.889981] [<c01577ae>] ? wake_bit_function+0x0/0x43
[46440.889993] [<c01d61b6>] wait_on_bit+0x20/0x2c
[46440.890005] [<c01d6d2e>] bdi_writeback_all+0x161/0x18e
[46440.890019] [<c0199f63>] ? wait_on_page_writeback_range+0x9d/0xdc
[46440.890032] [<c01d6e6f>] generic_sync_sb_inodes+0x2f/0xcc
[46440.890044] [<c01d6f7a>] sync_inodes_sb+0x6e/0x76
[46440.890057] [<c01c1aa0>] __fsync_super+0x63/0x66
[46440.890069] [<c01c1aae>] fsync_super+0xb/0x19
[46440.890080] [<c01c1d16>] generic_shutdown_super+0x1c/0xde
[46440.890092] [<c01c1df5>] kill_block_super+0x1d/0x31
[46440.890104] [<c01f0acd>] ? vfs_quota_off+0x0/0x12
[46440.890115] [<c01c2350>] deactivate_super+0x57/0x6b
[46440.890128] [<c01d217e>] mntput_no_expire+0xca/0xfb
[46440.890141] [<c01d265b>] sys_umount+0x28f/0x2b4
[46440.890153] [<c01d268d>] sys_oldumount+0xd/0xf
[46440.890166] [<c011c264>] sysenter_do_call+0x12/0x38
[46440.890176] 1 lock held by umount/22890:
[46440.890182] #0: (&type->s_umount_key#31){++++..}, at: [<c01c234b>] deactivate_super+0x52/0x6b
[46560.889079] INFO: task umount:22890 blocked for more than 120 seconds.
[46560.889097] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46560.889113] umount D 00002a0d 2288 22890 19517
[46560.889140] df5b0db8 00000046 d8a93c7f 00002a0d c0be7148 c0e5cbc8 c0163ebd c0a78700
[46560.889181] c0a78700 df5b0d74 c0164e28 f145a980 f145abfc c2d13700 00000000 d8ad1b4f
[46560.889221] 00002a0d c0165031 00000006 f145a980 c05e9dd4 00000002 df5b0d9c f145abfc
[46560.889260] Call Trace:
[46560.889291] [<c0163ebd>] ? lock_release_holdtime+0x30/0x131
[46560.889309] [<c0164e28>] ? mark_lock+0x1e/0x1e4
[46560.889327] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46560.889348] [<c05e9dd4>] ? _spin_unlock_irqrestore+0x3c/0x48
[46560.889366] [<c01652ba>] ? trace_hardirqs_on+0xb/0xd
[46560.889387] [<c05e823f>] schedule+0x8/0x17
[46560.889406] [<c01d7031>] bdi_sched_wait+0x8/0xc
[46560.889422] [<c05e8728>] __wait_on_bit+0x36/0x5d
[46560.889439] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46560.889457] [<c05e87fa>] out_of_line_wait_on_bit+0xab/0xb3
[46560.889475] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46560.889495] [<c01577ae>] ? wake_bit_function+0x0/0x43
[46560.889512] [<c01d61b6>] wait_on_bit+0x20/0x2c
[46560.889605] [<c01d6d2e>] bdi_writeback_all+0x161/0x18e
[46560.889635] [<c0199f63>] ? wait_on_page_writeback_range+0x9d/0xdc
[46560.889664] [<c01d6e6f>] generic_sync_sb_inodes+0x2f/0xcc
[46560.889689] [<c01d6f7a>] sync_inodes_sb+0x6e/0x76
[46560.889709] [<c01c1aa0>] __fsync_super+0x63/0x66
[46560.889726] [<c01c1aae>] fsync_super+0xb/0x19
[46560.889743] [<c01c1d16>] generic_shutdown_super+0x1c/0xde
[46560.889761] [<c01c1df5>] kill_block_super+0x1d/0x31
[46560.889780] [<c01f0acd>] ? vfs_quota_off+0x0/0x12
[46560.889797] [<c01c2350>] deactivate_super+0x57/0x6b
[46560.889816] [<c01d217e>] mntput_no_expire+0xca/0xfb
[46560.889835] [<c01d265b>] sys_umount+0x28f/0x2b4
[46560.889855] [<c01d268d>] sys_oldumount+0xd/0xf
[46560.889874] [<c011c264>] sysenter_do_call+0x12/0x38
[46560.889889] 1 lock held by umount/22890:
[46560.889899] #0: (&type->s_umount_key#31){++++..}, at: [<c01c234b>] deactivate_super+0x52/0x6b
[46680.889028] INFO: task umount:22890 blocked for more than 120 seconds.
[46680.889046] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46680.889061] umount D 00002a0d 2288 22890 19517
[46680.889088] df5b0db8 00000046 d8a93c7f 00002a0d c0be7148 c0e5cbc8 c0163ebd c0a78700
[46680.889130] c0a78700 df5b0d74 c0164e28 f145a980 f145abfc c2d13700 00000000 d8ad1b4f
[46680.889169] 00002a0d c0165031 00000006 f145a980 c05e9dd4 00000002 df5b0d9c f145abfc
[46680.889209] Call Trace:
[46680.889240] [<c0163ebd>] ? lock_release_holdtime+0x30/0x131
[46680.889259] [<c0164e28>] ? mark_lock+0x1e/0x1e4
[46680.889276] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46680.889297] [<c05e9dd4>] ? _spin_unlock_irqrestore+0x3c/0x48
[46680.889315] [<c01652ba>] ? trace_hardirqs_on+0xb/0xd
[46680.889336] [<c05e823f>] schedule+0x8/0x17
[46680.889355] [<c01d7031>] bdi_sched_wait+0x8/0xc
[46680.889372] [<c05e8728>] __wait_on_bit+0x36/0x5d
[46680.889389] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46680.889407] [<c05e87fa>] out_of_line_wait_on_bit+0xab/0xb3
[46680.889425] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46680.889444] [<c01577ae>] ? wake_bit_function+0x0/0x43
[46680.889462] [<c01d61b6>] wait_on_bit+0x20/0x2c
[46680.889480] [<c01d6d2e>] bdi_writeback_all+0x161/0x18e
[46680.889501] [<c0199f63>] ? wait_on_page_writeback_range+0x9d/0xdc
[46680.889605] [<c01d6e6f>] generic_sync_sb_inodes+0x2f/0xcc
[46680.889633] [<c01d6f7a>] sync_inodes_sb+0x6e/0x76
[46680.889662] [<c01c1aa0>] __fsync_super+0x63/0x66
[46680.889685] [<c01c1aae>] fsync_super+0xb/0x19
[46680.889711] [<c01c1d16>] generic_shutdown_super+0x1c/0xde
[46680.889737] [<c01c1df5>] kill_block_super+0x1d/0x31
[46680.889766] [<c01f0acd>] ? vfs_quota_off+0x0/0x12
[46680.889793] [<c01c2350>] deactivate_super+0x57/0x6b
[46680.889824] [<c01d217e>] mntput_no_expire+0xca/0xfb
[46680.889853] [<c01d265b>] sys_umount+0x28f/0x2b4
[46680.889884] [<c01d268d>] sys_oldumount+0xd/0xf
[46680.889913] [<c011c264>] sysenter_do_call+0x12/0x38
[46680.889936] 1 lock held by umount/22890:
[46680.889950] #0: (&type->s_umount_key#31){++++..}, at: [<c01c234b>] deactivate_super+0x52/0x6b
[46800.889776] INFO: task umount:22890 blocked for more than 120 seconds.
[46800.889793] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46800.889809] umount D 00002a0d 2288 22890 19517
[46800.889836] df5b0db8 00000046 d8a93c7f 00002a0d c0be7148 c0e5cbc8 c0163ebd c0a78700
[46800.889877] c0a78700 df5b0d74 c0164e28 f145a980 f145abfc c2d13700 00000000 d8ad1b4f
[46800.889917] 00002a0d c0165031 00000006 f145a980 c05e9dd4 00000002 df5b0d9c f145abfc
[46800.889956] Call Trace:
[46800.889987] [<c0163ebd>] ? lock_release_holdtime+0x30/0x131
[46800.890006] [<c0164e28>] ? mark_lock+0x1e/0x1e4
[46800.890023] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46800.890044] [<c05e9dd4>] ? _spin_unlock_irqrestore+0x3c/0x48
[46800.890062] [<c01652ba>] ? trace_hardirqs_on+0xb/0xd
[46800.890083] [<c05e823f>] schedule+0x8/0x17
[46800.890102] [<c01d7031>] bdi_sched_wait+0x8/0xc
[46800.890119] [<c05e8728>] __wait_on_bit+0x36/0x5d
[46800.890136] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46800.890153] [<c05e87fa>] out_of_line_wait_on_bit+0xab/0xb3
[46800.890171] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46800.890191] [<c01577ae>] ? wake_bit_function+0x0/0x43
[46800.890209] [<c01d61b6>] wait_on_bit+0x20/0x2c
[46800.890227] [<c01d6d2e>] bdi_writeback_all+0x161/0x18e
[46800.890248] [<c0199f63>] ? wait_on_page_writeback_range+0x9d/0xdc
[46800.890268] [<c01d6e6f>] generic_sync_sb_inodes+0x2f/0xcc
[46800.890286] [<c01d6f7a>] sync_inodes_sb+0x6e/0x76
[46800.890306] [<c01c1aa0>] __fsync_super+0x63/0x66
[46800.890323] [<c01c1aae>] fsync_super+0xb/0x19
[46800.890340] [<c01c1d16>] generic_shutdown_super+0x1c/0xde
[46800.890357] [<c01c1df5>] kill_block_super+0x1d/0x31
[46800.890376] [<c01f0acd>] ? vfs_quota_off+0x0/0x12
[46800.890393] [<c01c2350>] deactivate_super+0x57/0x6b
[46800.890413] [<c01d217e>] mntput_no_expire+0xca/0xfb
[46800.890431] [<c01d265b>] sys_umount+0x28f/0x2b4
[46800.890451] [<c01d268d>] sys_oldumount+0xd/0xf
[46800.890470] [<c011c264>] sysenter_do_call+0x12/0x38
[46800.890485] 1 lock held by umount/22890:
[46800.890494] #0: (&type->s_umount_key#31){++++..}, at: [<c01c234b>] deactivate_super+0x52/0x6b
[46920.888925] INFO: task umount:22890 blocked for more than 120 seconds.
[46920.888943] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46920.888959] umount D 00002a0d 2288 22890 19517
[46920.888986] df5b0db8 00000046 d8a93c7f 00002a0d c0be7148 c0e5cbc8 c0163ebd c0a78700
[46920.889027] c0a78700 df5b0d74 c0164e28 f145a980 f145abfc c2d13700 00000000 d8ad1b4f
[46920.889067] 00002a0d c0165031 00000006 f145a980 c05e9dd4 00000002 df5b0d9c f145abfc
[46920.889106] Call Trace:
[46920.889137] [<c0163ebd>] ? lock_release_holdtime+0x30/0x131
[46920.889155] [<c0164e28>] ? mark_lock+0x1e/0x1e4
[46920.889173] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46920.889194] [<c05e9dd4>] ? _spin_unlock_irqrestore+0x3c/0x48
[46920.889212] [<c01652ba>] ? trace_hardirqs_on+0xb/0xd
[46920.889233] [<c05e823f>] schedule+0x8/0x17
[46920.889252] [<c01d7031>] bdi_sched_wait+0x8/0xc
[46920.889268] [<c05e8728>] __wait_on_bit+0x36/0x5d
[46920.889286] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46920.889303] [<c05e87fa>] out_of_line_wait_on_bit+0xab/0xb3
[46920.889321] [<c01d7029>] ? bdi_sched_wait+0x0/0xc
[46920.889341] [<c01577ae>] ? wake_bit_function+0x0/0x43
[46920.889359] [<c01d61b6>] wait_on_bit+0x20/0x2c
[46920.889376] [<c01d6d2e>] bdi_writeback_all+0x161/0x18e
[46920.889397] [<c0199f63>] ? wait_on_page_writeback_range+0x9d/0xdc
[46920.889418] [<c01d6e6f>] generic_sync_sb_inodes+0x2f/0xcc
[46920.889436] [<c01d6f7a>] sync_inodes_sb+0x6e/0x76
[46920.889456] [<c01c1aa0>] __fsync_super+0x63/0x66
[46920.889472] [<c01c1aae>] fsync_super+0xb/0x19
[46920.889567] [<c01c1d16>] generic_shutdown_super+0x1c/0xde
[46920.889594] [<c01c1df5>] kill_block_super+0x1d/0x31
[46920.889623] [<c01f0acd>] ? vfs_quota_off+0x0/0x12
[46920.889647] [<c01c2350>] deactivate_super+0x57/0x6b
[46920.889675] [<c01d217e>] mntput_no_expire+0xca/0xfb
[46920.889703] [<c01d265b>] sys_umount+0x28f/0x2b4
[46920.889734] [<c01d268d>] sys_oldumount+0xd/0xf
[46920.889762] [<c011c264>] sysenter_do_call+0x12/0x38
[46920.889786] 1 lock held by umount/22890:
[46920.889800] #0: (&type->s_umount_key#31){++++..}, at: [<c01c234b>] deactivate_super+0x52/0x6b
[46920.889866] INFO: task fsstress:23920 blocked for more than 120 seconds.
[46920.889886] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46920.889906] fsstress D 00002a89 2032 23920 23919
[46920.889942] e8968f20 00000046 9fb7a303 00002a89 00000000 f5815c6c e8968ed0 c0a78700
[46920.890005] c0a78700 c0e5c7a0 e89604f0 e8960000 e896027c c2e61700 00000001 9fc1cb54
[46920.890070] 00002a89 00000000 e8960000 00000007 e8968f04 c0165031 00000006 e896027c
[46920.890133] Call Trace:
[46920.890163] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46920.890191] [<c05e9d8f>] ? _spin_unlock_irq+0x22/0x2b
[46920.890219] [<c016528e>] ? trace_hardirqs_on_caller+0x103/0x124
[46920.890251] [<c05e823f>] schedule+0x8/0x17
[46920.890277] [<c05e9a8c>] rwsem_down_failed_common+0x6d/0x84
[46920.890306] [<c05e9ae3>] rwsem_down_read_failed+0x1d/0x26
[46920.890335] [<c05e9b27>] call_rwsem_down_read_failed+0x7/0xc
[46920.890363] [<c05e90e5>] ? down_read+0x5e/0x6f
[46920.890390] [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.890418] [<c01d7018>] sync_inodes+0xd/0x1e
[46920.890444] [<c01d96fd>] do_sync+0x14/0x5a
[46920.890472] [<c01d9767>] sys_sync+0xd/0x12
[46920.890498] [<c011c264>] sysenter_do_call+0x12/0x38
[46920.890521] 1 lock held by fsstress/23920:
[46920.890535] #0: (&type->s_umount_key#31){++++..}, at: [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.890594] INFO: task fsstress:23921 blocked for more than 120 seconds.
[46920.890613] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46920.890633] fsstress D 00002a89 2212 23921 23919
[46920.890670] f14abf20 00000046 adcb3cde 00002a89 00000000 f5815c6c f14abed0 c0a78700
[46920.890732] c0a78700 c0e5c7a0 e8964330 e8963e40 e89640bc c2d13700 00000000 adf1f741
[46920.890796] 00002a89 00000000 e8963e40 00000007 f14abf04 c0165031 00000006 e89640bc
[46920.890858] Call Trace:
[46920.890887] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46920.890915] [<c05e9d8f>] ? _spin_unlock_irq+0x22/0x2b
[46920.890943] [<c016528e>] ? trace_hardirqs_on_caller+0x103/0x124
[46920.890975] [<c05e823f>] schedule+0x8/0x17
[46920.891001] [<c05e9a8c>] rwsem_down_failed_common+0x6d/0x84
[46920.891030] [<c05e9ae3>] rwsem_down_read_failed+0x1d/0x26
[46920.891059] [<c05e9b27>] call_rwsem_down_read_failed+0x7/0xc
[46920.891087] [<c05e90e5>] ? down_read+0x5e/0x6f
[46920.891114] [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.891142] [<c01d7018>] sync_inodes+0xd/0x1e
[46920.891168] [<c01d96fd>] do_sync+0x14/0x5a
[46920.891195] [<c01d9767>] sys_sync+0xd/0x12
[46920.891221] [<c011c264>] sysenter_do_call+0x12/0x38
[46920.891244] 1 lock held by fsstress/23921:
[46920.891258] #0: (&type->s_umount_key#31){++++..}, at: [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.891318] INFO: task fsstress:23922 blocked for more than 120 seconds.
[46920.891336] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46920.891356] fsstress D 00002a89 2508 23922 23919
[46920.891393] e89b1f20 00000046 9f55d644 00002a89 00000000 00000001 00000001 c0a78700
[46920.891456] c0a78700 c0e5c7a0 00962e70 e8962980 e8962bfc c2d13700 00000000 9f589dea
[46920.891522] 00002a89 00000000 e8962980 00000007 e89b1f04 c0165031 00000006 e8962bfc
[46920.891584] Call Trace:
[46920.891613] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46920.891641] [<c05e9d8f>] ? _spin_unlock_irq+0x22/0x2b
[46920.891669] [<c016528e>] ? trace_hardirqs_on_caller+0x103/0x124
[46920.891700] [<c05e823f>] schedule+0x8/0x17
[46920.891727] [<c05e9a8c>] rwsem_down_failed_common+0x6d/0x84
[46920.891756] [<c05e9ae3>] rwsem_down_read_failed+0x1d/0x26
[46920.891785] [<c05e9b27>] call_rwsem_down_read_failed+0x7/0xc
[46920.891812] [<c05e90e5>] ? down_read+0x5e/0x6f
[46920.891839] [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.891867] [<c01d7018>] sync_inodes+0xd/0x1e
[46920.891893] [<c01d96fd>] do_sync+0x14/0x5a
[46920.891921] [<c01d9767>] sys_sync+0xd/0x12
[46920.891947] [<c011c264>] sysenter_do_call+0x12/0x38
[46920.891969] 1 lock held by fsstress/23922:
[46920.891983] #0: (&type->s_umount_key#31){++++..}, at: [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.892038] INFO: task fsstress:23923 blocked for more than 120 seconds.
[46920.892055] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46920.892075] fsstress D 00002a89 2524 23923 23919
[46920.892113] e89f8f20 00000046 9f62c022 00002a89 00000000 f5815c6c e89f8ed0 c0a78700
[46920.892176] c0a78700 c0e5c7a0 f75299b0 f75294c0 f752973c c2e61700 00000001 9f6e75d6
[46920.892238] 00002a89 00000000 f75294c0 00000007 e89f8f04 c0165031 00000006 f752973c
[46920.892302] Call Trace:
[46920.892332] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46920.892362] [<c05e9d8f>] ? _spin_unlock_irq+0x22/0x2b
[46920.892390] [<c016528e>] ? trace_hardirqs_on_caller+0x103/0x124
[46920.892423] [<c05e823f>] schedule+0x8/0x17
[46920.892450] [<c05e9a8c>] rwsem_down_failed_common+0x6d/0x84
[46920.892478] [<c05e9ae3>] rwsem_down_read_failed+0x1d/0x26
[46920.892507] [<c05e9b27>] call_rwsem_down_read_failed+0x7/0xc
[46920.892535] [<c05e90e5>] ? down_read+0x5e/0x6f
[46920.892562] [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.892589] [<c01d7018>] sync_inodes+0xd/0x1e
[46920.892616] [<c01d96fd>] do_sync+0x14/0x5a
[46920.892643] [<c01d9767>] sys_sync+0xd/0x12
[46920.892669] [<c011c264>] sysenter_do_call+0x12/0x38
[46920.892692] 1 lock held by fsstress/23923:
[46920.892706] #0: (&type->s_umount_key#31){++++..}, at: [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.892765] INFO: task fsstress:23924 blocked for more than 120 seconds.
[46920.892784] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[46920.892804] fsstress D 00002a89 2472 23924 23919
[46920.892911] f1495f20 00000046 a24d3c01 00002a89 00000000 f5815c6c f1495ed0 c0a78700
[46920.892977] c0a78700 c0e5c7a0 f5994330 f5993e40 f59940bc c2e61700 00000001 a287d873
[46920.893039] 00002a89 00000000 f5993e40 00000007 f1495f04 c0165031 00000006 f59940bc
[46920.893101] Call Trace:
[46920.893132] [<c0165031>] ? mark_held_locks+0x43/0x5b
[46920.893161] [<c05e9d8f>] ? _spin_unlock_irq+0x22/0x2b
[46920.893189] [<c016528e>] ? trace_hardirqs_on_caller+0x103/0x124
[46920.893219] [<c05e823f>] schedule+0x8/0x17
[46920.893247] [<c05e9a8c>] rwsem_down_failed_common+0x6d/0x84
[46920.893276] [<c05e9ae3>] rwsem_down_read_failed+0x1d/0x26
[46920.893307] [<c05e9b27>] call_rwsem_down_read_failed+0x7/0xc
[46920.893333] [<c05e90e5>] ? down_read+0x5e/0x6f
[46920.893361] [<c01d6fb6>] __sync_inodes+0x34/0x89
[46920.893388] [<c01d7018>] sync_inodes+0xd/0x1e
[46920.893416] [<c01d96fd>] do_sync+0x14/0x5a
[46920.893442] [<c01d9767>] sys_sync+0xd/0x12
[46920.893470] [<c011c264>] sysenter_do_call+0x12/0x38
[46920.893492] 1 lock held by fsstress/23924:
[46920.893508] #0: (&type->s_umount_key#31){++++..}, at: [<c01d6fb6>] __sync_inodes+0x34/0x89
--
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