btrfs hung tasks

[John Drescher]

I am trying to debug this problem since it appears this is causing
mythtv to truncate recordings on top of other very long delays.

# uname -a
Linux jmd0.comcast.net 3.11.4-gentoo-jmd0 #1 SMP PREEMPT Mon Oct 7
21:04:44 EDT 2013 x86_64 Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz
GenuineIntel GNU/Linux

Here is 1 example of a hung task:

[ 3000.576427] INFO: task TFWWrite:11329 blocked for more than 120 seconds.
[ 3000.576430] "echo 0 > /proc/sys/kernel/hung_task_
timeout_secs" disables this message.
[ 3000.576433] TFWWrite D ffff8800a7ab5ac0 0 11329 1 0x00000000
[ 3000.576437] ffff8800a7ab5a18 0000000000000082 0000000000000002
ffff8800a7ab5fd8
[ 3000.576442] ffff8800a7ab5fd8 0000000000004000 ffff8801a6cfade0
ffff880099782de0
[ 3000.576445] 0000000000000000 00000000000000d3 00000000000001a6
0000000000000001
[ 3000.576449] Call Trace:
[ 3000.576458] [<ffffffff81074bfe>] ? load_balance+0xfe/0x800
[ 3000.576462] [<ffffffff8106e975>] ? sched_clock_local+0x25/0xa0
[ 3000.576466] [<ffffffff810d89e0>] ? __lock_page+0x70/0x70
[ 3000.576471] [<ffffffff81560664>] schedule+0x24/0x70
[ 3000.576474] [<ffffffff8156073a>] io_schedule+0x8a/0xd0
[ 3000.576477] [<ffffffff810d89e9>] sleep_on_page+0x9/0x10
[ 3000.576480] [<ffffffff8155e133>] __wait_on_bit_lock+0x53/0xb0
[ 3000.576484] [<ffffffff810d89d2>] __lock_page+0x62/0x70
[ 3000.576488] [<ffffffff810603c0>] ? wake_atomic_t_function+0x30/0x30
[ 3000.576492] [<ffffffff810d8b71>] find_lock_page+0x51/0x80
[ 3000.576495] [<ffffffff810d948a>] find_or_create_page+0x3a/0xc0
[ 3000.576499] [<ffffffff8128443c>] prepare_pages.isra.23+0x18c/0x340
[ 3000.576504] [<ffffffff81255990>] ? block_rsv_add_bytes+0x50/0x70
[ 3000.576508] [<ffffffff81284fca>] __btrfs_buffered_write+0x29a/0x4e0
[ 3000.576511] [<ffffffff81285425>] btrfs_file_aio_write+0x215/0x580
[ 3000.576515] [<ffffffff8111b30e>] ? kmem_cache_free+0xae/0x180
[ 3000.576519] [<ffffffff8113a4a1>] ? final_putname+0x21/0x50
[ 3000.576523] [<ffffffff8112eb1b>] do_sync_write+0x7b/0xb0
[ 3000.576527] [<ffffffff8112f8f0>] vfs_write+0xc0/0x1f0
[ 3000.576530] [<ffffffff8112fded>] SyS_write+0x4d/0xa0
[ 3000.576533] [<ffffffff81567b92>] system_call_fastpath+0x16/0x1b
[ 3000.576556] INFO: task btrfs-transacti:6770 blocked for more than
120 seconds.
[ 3000.576558] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3000.576559] btrfs-transacti D ffff8800a6d6f0c0 0 6770 2 0x00000000
[ 3000.576562] ffff8801500f5dd8 0000000000000046 ffff8801500f5d18
ffff8801500f5fd8
[ 3000.576566] ffff8801500f5fd8 0000000000004000 ffff88017f08dbc0
ffff88015eeb2de0
[ 3000.576569] ffff8801a86c0000 ffff8801a86b3990 0000000000000000
0000000000000000
[ 3000.576573] Call Trace:
[ 3000.576577] [<ffffffff8124cd05>] ? btrfs_free_path+0x25/0x30
[ 3000.576580] [<ffffffff81561e26>] ? _raw_spin_lock+0x16/0x40
[ 3000.576583] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3000.576587] [<ffffffff8128b1ff>] ? btrfs_run_ordered_operations+0x20f/0x2c0
[ 3000.576590] [<ffffffff81561e68>] ? _raw_spin_lock_irqsave+0x18/0x50
[ 3000.576593] [<ffffffff81561c23>] ? _raw_spin_unlock_irqrestore+0x13/0x40
[ 3000.576596] [<ffffffff81560664>] schedule+0x24/0x70
[ 3000.576600] [<ffffffff81272d7d>] btrfs_commit_transaction+0x33d/0x960
[ 3000.576603] [<ffffffff81060350>] ? abort_exclusive_wait+0xb0/0xb0
[ 3000.576607] [<ffffffff8126ae3d>] transaction_kthread+0x19d/0x220
[ 3000.576610] [<ffffffff8126aca0>] ? btrfs_alloc_root+0x30/0x30
[ 3000.576613] [<ffffffff8105f7fb>] kthread+0xbb/0xc0
[ 3000.576617] [<ffffffff81560000>] ? __schedule+0x4c0/0xa10
[ 3000.576620] [<ffffffff8105f740>] ? kthread_freezable_should_stop+0x60/0x60
[ 3000.576623] [<ffffffff81567aec>] ret_from_fork+0x7c/0xb0
[ 3000.576626] [<ffffffff8105f740>] ? kthread_freezable_should_stop+0x60/0x60
[ 3000.576652] INFO: task mythpreviewgen:12052 blocked for more than
120 seconds.
[ 3000.576654] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3000.576655] mythpreviewgen D ffff88015f6e8670 0 12052 12051 0x00000004
[ 3000.576659] ffff8801066adc08 0000000000000082 ffff8801066adb08
ffff8801066adfd8
[ 3000.576662] ffff8801066adfd8 0000000000004000 ffff8801a6cf96f0
ffff88018080ade0
[ 3000.576665] ffff8801a655d0c0 ffff8801a655d0c0 000000006d5f7675
0000000000000000
[ 3000.576669] Call Trace:
[ 3000.576676] [<ffffffffa01f7d4a>] ? do_expire_wait+0x17a/0x190 [autofs4]
[ 3000.576680] [<ffffffff81561e26>] ? _raw_spin_lock+0x16/0x40
[ 3000.576683] [<ffffffff81561e26>] ? _raw_spin_lock+0x16/0x40
[ 3000.576686] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3000.576689] [<ffffffff81560664>] schedule+0x24/0x70
[ 3000.576692] [<ffffffff81560943>] schedule_preempt_disabled+0x13/0x20
[ 3000.576695] [<ffffffff8155f0ec>] __mutex_lock_slowpath+0x12c/0x210
[ 3000.576699] [<ffffffff8155e23d>] mutex_lock+0x1d/0x40
[ 3000.576702] [<ffffffff8113d6e8>] do_last+0x268/0xd20
[ 3000.576705] [<ffffffff8113a773>] ? inode_permission+0x13/0x50
[ 3000.576708] [<ffffffff8113accd>] ? link_path_walk+0x23d/0x8e0
[ 3000.576711] [<ffffffff8113e25d>] path_openat+0xbd/0x6b0
[ 3000.576715] [<ffffffff8113eb8e>] do_filp_open+0x3e/0xa0
[ 3000.576718] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3000.576722] [<ffffffff8114b31b>] ? __alloc_fd+0xcb/0x120
[ 3000.576725] [<ffffffff8112e6ac>] do_sys_open+0x13c/0x230
[ 3000.576729] [<ffffffff8112e7bd>] SyS_open+0x1d/0x20
[ 3000.576731] [<ffffffff81567b92>] system_call_fastpath+0x16/0x1b
[ 3000.576734] INFO: task mythpreviewgen:12054 blocked for more than
120 seconds.
[ 3000.576736] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3000.576737] mythpreviewgen D ffff8801a86c06e0 0 12054 12053 0x00000004
[ 3000.576740] ffff880121141b28 0000000000000086 ffff880121141aa8
ffff880121141fd8
[ 3000.576744] ffff880121141fd8 0000000000004000 ffff8801a6cfade0
ffff88000a795bc0
[ 3000.576747] ffff880121141b58 ffffffff8125c7c7 ffff880121141a68
ffffffff81561ca1
[ 3000.576751] Call Trace:
[ 3000.576755] [<ffffffff8125c7c7>] ? reserve_metadata_bytes+0x177/0x880
[ 3000.576758] [<ffffffff81561ca1>] ? _raw_read_unlock+0x11/0x40
[ 3000.576762] [<ffffffff812a6f88>] ? btrfs_set_lock_blocking_rw+0xd8/0x110
[ 3000.576766] [<ffffffff81251d6f>] ? btrfs_search_slot+0x3ef/0x900
[ 3000.576769] [<ffffffff81561e68>] ? _raw_spin_lock_irqsave+0x18/0x50
[ 3000.576772] [<ffffffff81561c23>] ? _raw_spin_unlock_irqrestore+0x13/0x40
[ 3000.576775] [<ffffffff81560664>] schedule+0x24/0x70
[ 3000.576779] [<ffffffff81272017>] wait_current_trans.isra.34+0xb7/0x120
[ 3000.576782] [<ffffffff8127388c>] ? start_transaction+0x11c/0x4b0
[ 3000.576785] [<ffffffff81060350>] ? abort_exclusive_wait+0xb0/0xb0
[ 3000.576789] [<ffffffff81273a56>] start_transaction+0x2e6/0x4b0
[ 3000.576792] [<ffffffff81273f66>] btrfs_start_transaction+0x16/0x20
[ 3000.576795] [<ffffffff81280d82>] btrfs_create+0x42/0x210
[ 3000.576799] [<ffffffff81275f27>] ? btrfs_permission+0x37/0x70
[ 3000.576802] [<ffffffff8113a83e>] vfs_create+0x8e/0xf0
[ 3000.576805] [<ffffffff8113dd66>] do_last+0x8e6/0xd20
[ 3000.576808] [<ffffffff8113a773>] ? inode_permission+0x13/0x50
[ 3000.576812] [<ffffffff8113e25d>] path_openat+0xbd/0x6b0
[ 3000.576815] [<ffffffff8113eb8e>] do_filp_open+0x3e/0xa0
[ 3000.576818] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3000.576821] [<ffffffff8114b31b>] ? __alloc_fd+0xcb/0x120
[ 3000.576825] [<ffffffff8112e6ac>] do_sys_open+0x13c/0x230
[ 3000.576828] [<ffffffff8112e7bd>] SyS_open+0x1d/0x20
[ 3000.576831] [<ffffffff81567b92>] system_call_fastpath+0x16/0x1b
[ 3120.576415] INFO: task TFWWrite:11329 blocked for more than 120 seconds.
[ 3120.576419] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3120.576421] TFWWrite D ffff8800a7ab5ac0 0 11329 1 0x00000000
[ 3120.576426] ffff8800a7ab5a18 0000000000000082 0000000000000002
ffff8800a7ab5fd8
[ 3120.576431] ffff8800a7ab5fd8 0000000000004000 ffff8801a6cfade0
ffff880099782de0
[ 3120.576434] 0000000000000000 00000000000000d3 00000000000001a6
0000000000000001
[ 3120.576438] Call Trace:
[ 3120.576447] [<ffffffff81074bfe>] ? load_balance+0xfe/0x800
[ 3120.576451] [<ffffffff8106e975>] ? sched_clock_local+0x25/0xa0
[ 3120.576455] [<ffffffff810d89e0>] ? __lock_page+0x70/0x70
[ 3120.576460] [<ffffffff81560664>] schedule+0x24/0x70
[ 3120.576463] [<ffffffff8156073a>] io_schedule+0x8a/0xd0
[ 3120.576466] [<ffffffff810d89e9>] sleep_on_page+0x9/0x10
[ 3120.576469] [<ffffffff8155e133>] __wait_on_bit_lock+0x53/0xb0
[ 3120.576473] [<ffffffff810d89d2>] __lock_page+0x62/0x70
[ 3120.576477] [<ffffffff810603c0>] ? wake_atomic_t_function+0x30/0x30
[ 3120.576480] [<ffffffff810d8b71>] find_lock_page+0x51/0x80
[ 3120.576483] [<ffffffff810d948a>] find_or_create_page+0x3a/0xc0
[ 3120.576487] [<ffffffff8128443c>] prepare_pages.isra.23+0x18c/0x340
[ 3120.576491] [<ffffffff81255990>] ? block_rsv_add_bytes+0x50/0x70
[ 3120.576495] [<ffffffff81284fca>] __btrfs_buffered_write+0x29a/0x4e0
[ 3120.576499] [<ffffffff81285425>] btrfs_file_aio_write+0x215/0x580
[ 3120.576502] [<ffffffff8111b30e>] ? kmem_cache_free+0xae/0x180
[ 3120.576506] [<ffffffff8113a4a1>] ? final_putname+0x21/0x50
[ 3120.576510] [<ffffffff8112eb1b>] do_sync_write+0x7b/0xb0
[ 3120.576514] [<ffffffff8112f8f0>] vfs_write+0xc0/0x1f0
[ 3120.576517] [<ffffffff8112fded>] SyS_write+0x4d/0xa0
[ 3120.576521] [<ffffffff81567b92>] system_call_fastpath+0x16/0x1b
[ 3120.576543] INFO: task btrfs-transacti:6770 blocked for more than
120 seconds.
[ 3120.576545] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3120.576546] btrfs-transacti D ffff8800a6d6f0c0 0 6770 2 0x00000000
[ 3120.576549] ffff8801500f5dd8 0000000000000046 ffff8801500f5d18
ffff8801500f5fd8
[ 3120.576553] ffff8801500f5fd8 0000000000004000 ffff88017f08dbc0
ffff88015eeb2de0
[ 3120.576556] ffff8801a86c0000 ffff8801a86b3990 0000000000000000
0000000000000000
[ 3120.576560] Call Trace:
[ 3120.576563] [<ffffffff8124cd05>] ? btrfs_free_path+0x25/0x30
[ 3120.576567] [<ffffffff81561e26>] ? _raw_spin_lock+0x16/0x40
[ 3120.576570] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3120.576573] [<ffffffff8128b1ff>] ? btrfs_run_ordered_operations+0x20f/0x2c0
[ 3120.576577] [<ffffffff81561e68>] ? _raw_spin_lock_irqsave+0x18/0x50
[ 3120.576580] [<ffffffff81561c23>] ? _raw_spin_unlock_irqrestore+0x13/0x40
[ 3120.576583] [<ffffffff81560664>] schedule+0x24/0x70
[ 3120.576587] [<ffffffff81272d7d>] btrfs_commit_transaction+0x33d/0x960
[ 3120.576590] [<ffffffff81060350>] ? abort_exclusive_wait+0xb0/0xb0
[ 3120.576594] [<ffffffff8126ae3d>] transaction_kthread+0x19d/0x220
[ 3120.576597] [<ffffffff8126aca0>] ? btrfs_alloc_root+0x30/0x30
[ 3120.576600] [<ffffffff8105f7fb>] kthread+0xbb/0xc0
[ 3120.576604] [<ffffffff81560000>] ? __schedule+0x4c0/0xa10
[ 3120.576607] [<ffffffff8105f740>] ? kthread_freezable_should_stop+0x60/0x60
[ 3120.576610] [<ffffffff81567aec>] ret_from_fork+0x7c/0xb0
[ 3120.576613] [<ffffffff8105f740>] ? kthread_freezable_should_stop+0x60/0x60
[ 3120.576634] INFO: task kworker/u8:0:9957 blocked for more than 120 seconds.
[ 3120.576636] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3120.576637] kworker/u8:0 D ffff8801a4716d20 0 9957 2 0x00000000
[ 3120.576644] Workqueue: writeback bdi_writeback_workfn (flush-btrfs-7)
[ 3120.576646] ffff88010080b6f8 0000000000000046 0000000000000000
ffff88010080bfd8
[ 3120.576649] ffff88010080bfd8 0000000000004000 ffff8801758e16f0
ffff88014e4f2de0
[ 3120.576653] ffff88010080b668 ffffffff8111b477 ffffffff810dadf0
0001120000000010
[ 3120.576656] Call Trace:
[ 3120.576659] [<ffffffff8111b477>] ? kmem_cache_alloc+0x57/0xf0
[ 3120.576663] [<ffffffff810dadf0>] ? mempool_alloc_slab+0x10/0x20
[ 3120.576666] [<ffffffff810dadf0>] ? mempool_alloc_slab+0x10/0x20
[ 3120.576668] [<ffffffff810db0f5>] ? mempool_alloc+0x55/0x150
[ 3120.576672] [<ffffffff81561e68>] ? _raw_spin_lock_irqsave+0x18/0x50
[ 3120.576675] [<ffffffff81561c23>] ? _raw_spin_unlock_irqrestore+0x13/0x40
[ 3120.576678] [<ffffffff81560664>] schedule+0x24/0x70
[ 3120.576682] [<ffffffff81272017>] wait_current_trans.isra.34+0xb7/0x120
[ 3120.576685] [<ffffffff81060350>] ? abort_exclusive_wait+0xb0/0xb0
[ 3120.576688] [<ffffffff812739f8>] start_transaction+0x288/0x4b0
[ 3120.576692] [<ffffffff81273ce2>] btrfs_join_transaction+0x12/0x20
[ 3120.576695] [<ffffffff8127aa00>] cow_file_range+0x40/0xe0
[ 3120.576698] [<ffffffff8127adfb>] run_delalloc_range+0x35b/0x390
[ 3120.576702] [<ffffffff812907f9>] __extent_writepage+0x2b9/0x730
[ 3120.576706] [<ffffffff8115c450>] ? end_buffer_async_read+0x1e0/0x1e0
[ 3120.576709] [<ffffffff81162400>] ? I_BDEV+0x10/0x10
[ 3120.576713] [<ffffffff813328c0>] ? merge+0x50/0xa0
[ 3120.576718] [<ffffffff81290f02>]
extent_write_cache_pages.isra.40.constprop.57+0x292/0x3d0
[ 3120.576722] [<ffffffff812912c8>] extent_writepages+0x48/0x60
[ 3120.576725] [<ffffffff81276fd0>] ? btrfs_fiemap+0x60/0x60
[ 3120.576728] [<ffffffff81275ee3>] btrfs_writepages+0x23/0x30
[ 3120.576732] [<ffffffff810e2969>] do_writepages+0x19/0x40
[ 3120.576736] [<ffffffff8115489e>] __writeback_single_inode+0x3e/0x140
[ 3120.576739] [<ffffffff811559a6>] writeback_sb_inodes+0x276/0x3c0
[ 3120.576742] [<ffffffff81155b87>] __writeback_inodes_wb+0x97/0xd0
[ 3120.576746] [<ffffffff81155d8b>] wb_writeback+0x1cb/0x1e0
[ 3120.576749] [<ffffffff811560ae>] bdi_writeback_workfn+0x15e/0x310
[ 3120.576754] [<ffffffff810590d0>] process_one_work+0x140/0x390
[ 3120.576757] [<ffffffff81059759>] worker_thread+0x119/0x370
[ 3120.576761] [<ffffffff81059640>] ? rescuer_thread+0x2e0/0x2e0
[ 3120.576764] [<ffffffff8105f7fb>] kthread+0xbb/0xc0
[ 3120.576767] [<ffffffff81560000>] ? __schedule+0x4c0/0xa10
[ 3120.576771] [<ffffffff8105f740>] ? kthread_freezable_should_stop+0x60/0x60
[ 3120.576774] [<ffffffff81567aec>] ret_from_fork+0x7c/0xb0
[ 3120.576777] [<ffffffff8105f740>] ? kthread_freezable_should_stop+0x60/0x60
[ 3120.576782] INFO: task mythpreviewgen:12052 blocked for more than
120 seconds.
[ 3120.576784] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3120.576785] mythpreviewgen D ffff88015f6e8670 0 12052 12051 0x00000004
[ 3120.576789] ffff8801066adc08 0000000000000082 ffff8801066adb08
ffff8801066adfd8
[ 3120.576792] ffff8801066adfd8 0000000000004000 ffff8801a6cf96f0
ffff88018080ade0
[ 3120.576796] ffff8801a655d0c0 ffff8801a655d0c0 000000006d5f7675
0000000000000000
[ 3120.576799] Call Trace:
[ 3120.576807] [<ffffffffa01f7d4a>] ? do_expire_wait+0x17a/0x190 [autofs4]
[ 3120.576810] [<ffffffff81561e26>] ? _raw_spin_lock+0x16/0x40
[ 3120.576813] [<ffffffff81561e26>] ? _raw_spin_lock+0x16/0x40
[ 3120.576816] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3120.576819] [<ffffffff81560664>] schedule+0x24/0x70
[ 3120.576823] [<ffffffff81560943>] schedule_preempt_disabled+0x13/0x20
[ 3120.576826] [<ffffffff8155f0ec>] __mutex_lock_slowpath+0x12c/0x210
[ 3120.576829] [<ffffffff8155e23d>] mutex_lock+0x1d/0x40
[ 3120.576832] [<ffffffff8113d6e8>] do_last+0x268/0xd20
[ 3120.576835] [<ffffffff8113a773>] ? inode_permission+0x13/0x50
[ 3120.576838] [<ffffffff8113accd>] ? link_path_walk+0x23d/0x8e0
[ 3120.576841] [<ffffffff8113e25d>] path_openat+0xbd/0x6b0
[ 3120.576845] [<ffffffff8113eb8e>] do_filp_open+0x3e/0xa0
[ 3120.576848] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3120.576852] [<ffffffff8114b31b>] ? __alloc_fd+0xcb/0x120
[ 3120.576855] [<ffffffff8112e6ac>] do_sys_open+0x13c/0x230
[ 3120.576859] [<ffffffff8112e7bd>] SyS_open+0x1d/0x20
[ 3120.576861] [<ffffffff81567b92>] system_call_fastpath+0x16/0x1b
[ 3120.576864] INFO: task mythpreviewgen:12054 blocked for more than
120 seconds.
[ 3120.576866] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 3120.576867] mythpreviewgen D ffff8801a86c06e0 0 12054 12053 0x00000004
[ 3120.576870] ffff880121141b28 0000000000000086 ffff880121141aa8
ffff880121141fd8
[ 3120.576874] ffff880121141fd8 0000000000004000 ffff8801a6cfade0
ffff88000a795bc0
[ 3120.576877] ffff880121141b58 ffffffff8125c7c7 ffff880121141a68
ffffffff81561ca1
[ 3120.576881] Call Trace:
[ 3120.576885] [<ffffffff8125c7c7>] ? reserve_metadata_bytes+0x177/0x880
[ 3120.576888] [<ffffffff81561ca1>] ? _raw_read_unlock+0x11/0x40
[ 3120.576892] [<ffffffff812a6f88>] ? btrfs_set_lock_blocking_rw+0xd8/0x110
[ 3120.576895] [<ffffffff81251d6f>] ? btrfs_search_slot+0x3ef/0x900
[ 3120.576899] [<ffffffff81561e68>] ? _raw_spin_lock_irqsave+0x18/0x50
[ 3120.576902] [<ffffffff81561c23>] ? _raw_spin_unlock_irqrestore+0x13/0x40
[ 3120.576905] [<ffffffff81560664>] schedule+0x24/0x70
[ 3120.576908] [<ffffffff81272017>] wait_current_trans.isra.34+0xb7/0x120
[ 3120.576911] [<ffffffff8127388c>] ? start_transaction+0x11c/0x4b0
[ 3120.576915] [<ffffffff81060350>] ? abort_exclusive_wait+0xb0/0xb0
[ 3120.576918] [<ffffffff81273a56>] start_transaction+0x2e6/0x4b0
[ 3120.576922] [<ffffffff81273f66>] btrfs_start_transaction+0x16/0x20
[ 3120.576925] [<ffffffff81280d82>] btrfs_create+0x42/0x210
[ 3120.576928] [<ffffffff81275f27>] ? btrfs_permission+0x37/0x70
[ 3120.576931] [<ffffffff8113a83e>] vfs_create+0x8e/0xf0
[ 3120.576934] [<ffffffff8113dd66>] do_last+0x8e6/0xd20
[ 3120.576937] [<ffffffff8113a773>] ? inode_permission+0x13/0x50
[ 3120.576941] [<ffffffff8113e25d>] path_openat+0xbd/0x6b0
[ 3120.576944] [<ffffffff8113eb8e>] do_filp_open+0x3e/0xa0
[ 3120.576947] [<ffffffff81561be1>] ? _raw_spin_unlock+0x11/0x40
[ 3120.576951] [<ffffffff8114b31b>] ? __alloc_fd+0xcb/0x120
[ 3120.576954] [<ffffffff8112e6ac>] do_sys_open+0x13c/0x230
[ 3120.576957] [<ffffffff8112e7bd>] SyS_open+0x1d/0x20
[ 3120.576960] [<ffffffff81567b92>] system_call_fastpath+0x16/

--
John M. Drescher
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[Hugo Mills]

[cc'd linux-btrfs]

=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
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--- Jazz is the sort of music where no-one plays anything the ---
same way once.