I see this is the second once in my life:
[ 480.007335] INFO: task kworker/u16:1:106 blocked for more than 120 seconds.
[ 480.007338] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.007339] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.007340] kworker/u16:1 D ffff8807fe9d76d8 11112 106 2 0x00000000
[ 480.007348] Workqueue: writeback wb_workfn (flush-btrfs-1)
[ 480.007350] ffff8807f539f438 0000000000000092 ffff8807f539f408
0000000000000000
[ 480.007351] ffff8807fa365480 ffff8807f53a0000 ffff8807f539f458
ffff8807f53a0000
[ 480.007353] ffff8806b7939eb0 ffff8807f53a0000 ffff8807f53a0000
ffff8807f539f480
[ 480.007355] Call Trace:
[ 480.007358] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.007372] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.007374] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.007379] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.007384] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.007385] [<ffffffff81871cab>] ? _raw_spin_unlock+0x2b/0x40
[ 480.007391] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.007398] [<ffffffffa07cea9d>] run_delalloc_nocow+0x15d/0xb40 [btrfs]
[ 480.007400] [<ffffffff810e7e2c>] ? local_clock+0x1c/0x20
[ 480.007407] [<ffffffffa07e8118>] ? test_range_bit+0x48/0x130 [btrfs]
[ 480.007410] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.007416] [<ffffffffa07e81b5>] ? test_range_bit+0xe5/0x130 [btrfs]
[ 480.007422] [<ffffffffa07cf820>] run_delalloc_range+0x3a0/0x400 [btrfs]
[ 480.007429] [<ffffffffa07e83e7>] ?
find_lock_delalloc_range.constprop.46+0x1e7/0x210 [btrfs]
[ 480.007435] [<ffffffffa07e8515>]
writepage_delalloc.isra.34+0x105/0x170 [btrfs]
[ 480.007441] [<ffffffffa07ea2c5>] __extent_writepage+0xf5/0x4a0 [btrfs]
[ 480.007446] [<ffffffffa07ea97a>]
extent_write_cache_pages.isra.31.constprop.44+0x30a/0x400 [btrfs]
[ 480.007452] [<ffffffffa07ebb4c>] extent_writepages+0x5c/0x90 [btrfs]
[ 480.007458] [<ffffffffa07cc140>] ?
btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
[ 480.007464] [<ffffffffa07c9aa8>] btrfs_writepages+0x28/0x30 [btrfs]
[ 480.007466] [<ffffffff811f3711>] do_writepages+0x21/0x30
[ 480.007468] [<ffffffff812a4bb0>] __writeback_single_inode+0x70/0xa20
[ 480.007469] [<ffffffff812a5d26>] writeback_sb_inodes+0x2d6/0x6d0
[ 480.007471] [<ffffffff812a61ac>] __writeback_inodes_wb+0x8c/0xc0
[ 480.007473] [<ffffffff812a65ad>] wb_writeback+0x3cd/0x720
[ 480.007475] [<ffffffff81435575>] ? find_next_bit+0x15/0x20
[ 480.007476] [<ffffffff812a7485>] wb_workfn+0x405/0x8d0
[ 480.007479] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.007480] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.007482] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.007484] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.007485] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.007487] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.007488] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.007490] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007491] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.007493] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007494] 4 locks held by kworker/u16:1/106:
[ 480.007495] #0: ("writeback"){.+.+.+}, at: [<ffffffff810cc39b>]
process_one_work+0x19b/0x840
[ 480.007499] #1: ((&(&wb->dwork)->work)){+.+.+.}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007501] #2: (&type->s_umount_key#57){.+.+..}, at:
[<ffffffff81273e9b>] trylock_super+0x1b/0x50
[ 480.007505] #3: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.007514] INFO: task kworker/u16:2:140 blocked for more than 120 seconds.
[ 480.007515] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.007515] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.007516] kworker/u16:2 D ffff8807fe5d76d8 11800 140 2 0x00000000
[ 480.007526] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 480.007527] ffff8807f4dc3848 0000000000000096 ffff8807f4dc3818
0000000000000000
[ 480.007529] ffff8807fa360000 ffff8807f534aa40 ffff8807f4dc3868
ffff8807f4dc4000
[ 480.007530] ffff8806b7939eb0 ffff8807f534aa40 ffff8807f534aa40
ffff8807f4dc3890
[ 480.007532] Call Trace:
[ 480.007533] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.007539] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.007541] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.007545] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.007549] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.007551] [<ffffffff81109139>] ? __lock_acquire+0xcb9/0x1d00
[ 480.007556] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.007562] [<ffffffffa07dc007>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 480.007564] [<ffffffff8124cf1e>] ? kmem_cache_alloc+0x33e/0x360
[ 480.007567] [<ffffffffa07993da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 480.007573] [<ffffffffa07ca9f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 480.007578] [<ffffffffa07c5cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 480.007583] [<ffffffffa07d0cbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 480.007586] [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[ 480.007591] [<ffffffffa07d12a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 480.007598] [<ffffffffa07fb7c5>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 480.007603] [<ffffffffa07fbfce>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 480.007605] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.007607] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.007608] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.007610] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.007612] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.007613] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.007615] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.007616] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007618] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.007619] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007620] 3 locks held by kworker/u16:2/140:
[ 480.007621] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007624] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007626] #2: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.007634] INFO: task kworker/u16:3:141 blocked for more than 120 seconds.
[ 480.007634] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.007635] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.007636] kworker/u16:3 D ffff8807fe3d76d8 9752 141 2 0x00000000
[ 480.007643] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 480.007644] ffff8807f4dc7848 0000000000000096 ffff8807f4dc7818
0000000000000000
[ 480.007646] ffff8807fa345480 ffff8807f5348000 ffff8807f4dc7868
ffff8807f4dc8000
[ 480.007647] ffff8806b7939eb0 ffff8807f5348000 ffff8807f5348000
ffff8807f4dc7890
[ 480.007649] Call Trace:
[ 480.007650] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.007656] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.007658] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.007662] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.007665] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.007667] [<ffffffff81107f2d>] ? mark_held_locks+0x7d/0xb0
[ 480.007672] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.007678] [<ffffffffa07dc007>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 480.007679] [<ffffffff8124cf1e>] ? kmem_cache_alloc+0x33e/0x360
[ 480.007683] [<ffffffffa07993da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 480.007688] [<ffffffffa07ca9f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 480.007693] [<ffffffffa07c5cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 480.007698] [<ffffffffa07d0cbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 480.007700] [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[ 480.007705] [<ffffffffa07d12a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 480.007711] [<ffffffffa07fb7c5>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 480.007716] [<ffffffffa07fbfce>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 480.007718] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.007719] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.007721] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.007722] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.007724] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.007726] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.007727] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.007729] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007730] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.007732] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007733] 3 locks held by kworker/u16:3/141:
[ 480.007733] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007736] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007739] #2: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.007746] INFO: task kworker/u16:4:142 blocked for more than 120 seconds.
[ 480.007747] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.007747] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.007748] kworker/u16:4 D ffff8807fddd76d8 9320 142 2 0x00000000
[ 480.007755] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 480.007756] ffff8807f4de3848 0000000000000096 ffff8807f4de3818
0000000000000000
[ 480.007758] ffffffff81e12500 ffff8807f5325480 ffff8807f4de3868
ffff8807f4de4000
[ 480.007759] ffff8806b7939eb0 ffff8807f5325480 ffff8807f5325480
ffff8807f4de3890
[ 480.007761] Call Trace:
[ 480.007762] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.007768] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.007769] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.007773] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.007776] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.007778] [<ffffffff81107f2d>] ? mark_held_locks+0x7d/0xb0
[ 480.007783] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.007789] [<ffffffffa07dc007>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 480.007790] [<ffffffff8124cf1e>] ? kmem_cache_alloc+0x33e/0x360
[ 480.007793] [<ffffffffa07993da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 480.007799] [<ffffffffa07ca9f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 480.007804] [<ffffffffa07c5cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 480.007809] [<ffffffffa07d0cbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 480.007810] [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[ 480.007815] [<ffffffffa07d12a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 480.007821] [<ffffffffa07fb7c5>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 480.007826] [<ffffffffa07fbfce>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 480.007828] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.007829] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.007831] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.007832] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.007834] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.007835] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.007837] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.007838] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007840] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.007841] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007842] 3 locks held by kworker/u16:4/142:
[ 480.007843] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007845] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007848] #2: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.007855] INFO: task kworker/u16:5:143 blocked for more than 120 seconds.
[ 480.007856] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.007856] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.007857] kworker/u16:5 D ffff8807fe5d76d8 10888 143 2 0x00000000
[ 480.007864] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 480.007865] ffff8807f4de7848 0000000000000096 ffff8807f4de7818
0000000000000000
[ 480.007867] ffff8807fa360000 ffff8807f5322a40 ffff8807f4de7868
ffff8807f4de8000
[ 480.007868] ffff8806b7939eb0 ffff8807f5322a40 ffff8807f5322a40
ffff8807f4de7890
[ 480.007870] Call Trace:
[ 480.007871] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.007877] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.007878] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.007882] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.007885] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.007887] [<ffffffff81107f2d>] ? mark_held_locks+0x7d/0xb0
[ 480.007892] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.007897] [<ffffffffa07dc007>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 480.007899] [<ffffffff8124cf1e>] ? kmem_cache_alloc+0x33e/0x360
[ 480.007902] [<ffffffffa07993da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 480.007907] [<ffffffffa07ca9f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 480.007912] [<ffffffffa07c5cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 480.007917] [<ffffffffa07d0cbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 480.007919] [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[ 480.007923] [<ffffffffa07d12a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 480.007929] [<ffffffffa07fb7c5>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 480.007935] [<ffffffffa07fbfce>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 480.007936] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.007938] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.007939] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.007941] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.007943] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.007944] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.007945] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.007947] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007948] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.007950] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.007951] 3 locks held by kworker/u16:5/143:
[ 480.007951] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007954] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.007956] #2: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.007964] INFO: task kworker/u16:7:154 blocked for more than 120 seconds.
[ 480.007965] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.007965] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.007966] kworker/u16:7 D ffff8807fe5d76d8 11448 154 2 0x00000000
[ 480.007973] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 480.007974] ffff8807f4e73848 0000000000000096 ffff8807f4e73818
0000000000000000
[ 480.007976] ffff8807fa360000 ffff8807f52ed480 ffff8807f4e73868
ffff8807f4e74000
[ 480.007977] ffff8806b7939eb0 ffff8807f52ed480 ffff8807f52ed480
ffff8807f4e73890
[ 480.007979] Call Trace:
[ 480.007980] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.007986] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.007987] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.007991] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.007994] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.007996] [<ffffffff81107f2d>] ? mark_held_locks+0x7d/0xb0
[ 480.008001] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.008006] [<ffffffffa07dc007>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 480.008008] [<ffffffff81107f2d>] ? mark_held_locks+0x7d/0xb0
[ 480.008009] [<ffffffff8124cf1e>] ? kmem_cache_alloc+0x33e/0x360
[ 480.008012] [<ffffffffa07993da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 480.008017] [<ffffffffa07ca9f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 480.008022] [<ffffffffa07c5cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 480.008027] [<ffffffffa07d0cbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 480.008029] [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[ 480.008033] [<ffffffffa07d12a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 480.008039] [<ffffffffa07fb7c5>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 480.008045] [<ffffffffa07fbfce>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 480.008046] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.008048] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.008049] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.008051] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.008053] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.008054] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.008055] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.008057] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.008058] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.008060] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.008061] 3 locks held by kworker/u16:7/154:
[ 480.008061] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.008064] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.008066] #2: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.008073] INFO: task kworker/u16:8:191 blocked for more than 120 seconds.
[ 480.008074] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.008075] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.008075] kworker/u16:8 D ffff8807fe3d76d8 11448 191 2 0x00000000
[ 480.008083] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 480.008084] ffff88009c68f848 0000000000000096 ffff88009c68f818
0000000000000000
[ 480.008085] ffff8807fa345480 ffff8807f4c88000 ffff88009c68f868
ffff88009c690000
[ 480.008087] ffff8806b7939eb0 ffff8807f4c88000 ffff8807f4c88000
ffff88009c68f890
[ 480.008088] Call Trace:
[ 480.008090] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.008095] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.008097] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.008100] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.008104] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.008105] [<ffffffff81107f2d>] ? mark_held_locks+0x7d/0xb0
[ 480.008110] [<ffffffffa07b98d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 480.008116] [<ffffffffa07dc007>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 480.008117] [<ffffffff8124cf1e>] ? kmem_cache_alloc+0x33e/0x360
[ 480.008120] [<ffffffffa07993da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 480.008126] [<ffffffffa07ca9f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 480.008130] [<ffffffffa07c5cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 480.008136] [<ffffffffa07d0cbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 480.008140] [<ffffffffa07d12a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 480.008146] [<ffffffffa07fb7c5>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 480.008152] [<ffffffffa07fbfce>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 480.008153] [<ffffffff810cc432>] process_one_work+0x232/0x840
[ 480.008155] [<ffffffff810cc39b>] ? process_one_work+0x19b/0x840
[ 480.008156] [<ffffffff8112851d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 480.008158] [<ffffffff810ccb15>] ? worker_thread+0xd5/0x450
[ 480.008160] [<ffffffff810cca8e>] worker_thread+0x4e/0x450
[ 480.008161] [<ffffffff810cca40>] ? process_one_work+0x840/0x840
[ 480.008162] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.008164] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.008165] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.008167] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.008168] 3 locks held by kworker/u16:8/191:
[ 480.008168] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.008171] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc39b>] process_one_work+0x19b/0x840
[ 480.008174] #2: (sb_internal#2){.+.+..}, at: [<ffffffffa07c7fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 480.008187] INFO: task btrfs-transacti:777 blocked for more than 120 seconds.
[ 480.008188] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.008188] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.008189] btrfs-transacti D ffff8807fe3d76d8 10648 777 2 0x00000080
[ 480.008192] ffff8807e45c3aa8 0000000000000092 ffff8807e45c3a78
0000000000000000
[ 480.008193] ffff8807fa345480 ffff8807f26a8000 ffff8807e45c3ac8
ffff8807e45c4000
[ 480.008195] ffff8806b7939eb0 ffff8807f26a8000 ffff8807f26a8000
ffff8807e45c3af0
[ 480.008197] Call Trace:
[ 480.008198] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.008204] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.008205] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.008209] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.008212] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.008214] [<ffffffff8186eaf9>] ? mutex_lock_nested+0x279/0x3e0
[ 480.008220] [<ffffffffa082438c>] ?
__btrfs_run_delayed_items+0xfc/0x600 [btrfs]
[ 480.008224] [<ffffffffa07a07c1>] btrfs_insert_empty_items+0x71/0xc0 [btrfs]
[ 480.008230] [<ffffffffa08243c5>]
__btrfs_run_delayed_items+0x135/0x600 [btrfs]
[ 480.008231] [<ffffffff81026d49>] ? sched_clock+0x9/0x10
[ 480.008237] [<ffffffffa0824ee3>] btrfs_run_delayed_items+0x13/0x20 [btrfs]
[ 480.008242] [<ffffffffa07c7220>]
btrfs_commit_transaction+0x2f0/0xc80 [btrfs]
[ 480.008247] [<ffffffffa07c21a8>] transaction_kthread+0x208/0x270 [btrfs]
[ 480.008251] [<ffffffffa07c1fa0>] ?
btrfs_cleanup_transaction+0x6e0/0x6e0 [btrfs]
[ 480.008253] [<ffffffff810d36d4>] kthread+0x104/0x120
[ 480.008254] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.008256] [<ffffffff81872bdf>] ret_from_fork+0x3f/0x70
[ 480.008257] [<ffffffff810d35d0>] ? kthread_create_on_node+0x250/0x250
[ 480.008258] 2 locks held by btrfs-transacti/777:
[ 480.008259] #0: (&fs_info->transaction_kthread_mutex){+.+...},
at: [<ffffffffa07c2012>] transaction_kthread+0x72/0x270 [btrfs]
[ 480.008264] #1: (&delayed_node->mutex){+.+...}, at:
[<ffffffffa082438c>] __btrfs_run_delayed_items+0xfc/0x600 [btrfs]
[ 480.008298] INFO: task pool:4655 blocked for more than 120 seconds.
[ 480.008298] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.008299] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.008300] pool D ffff8807fe5d76d8 13176 4655 2015 0x00000000
[ 480.008303] ffff880668c27a28 0000000000000096 ffff880668c279f8
0000000000000000
[ 480.008304] ffff8807fa360000 ffff8806ad95aa40 ffff880668c27a48
ffff880668c28000
[ 480.008306] ffff8806b7939eb0 ffff8806ad95aa40 ffff8806ad95aa40
ffff880668c27a70
[ 480.008307] Call Trace:
[ 480.008309] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.008339] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.008340] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.008344] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.008348] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.008350] [<ffffffff813c6e10>] ? crypto_shash_update+0x30/0xe0
[ 480.008355] [<ffffffffa07b8ad8>] btrfs_lookup_dir_item+0x78/0xc0 [btrfs]
[ 480.008362] [<ffffffffa07d4ff2>] btrfs_lookup_dentry+0xb2/0x510 [btrfs]
[ 480.008364] [<ffffffff81871cab>] ? _raw_spin_unlock+0x2b/0x40
[ 480.008369] [<ffffffffa07d5466>] btrfs_lookup+0x16/0x40 [btrfs]
[ 480.008371] [<ffffffff8127ac9d>] lookup_real+0x1d/0x60
[ 480.008372] [<ffffffff81280449>] path_openat+0xa49/0x12b0
[ 480.008374] [<ffffffff81026cd8>] ? native_sched_clock+0x28/0x90
[ 480.008376] [<ffffffff812bb400>] ?
__fsnotify_update_child_dentry_flags.part.1+0xf0/0x120
[ 480.008378] [<ffffffff81026cd8>] ? native_sched_clock+0x28/0x90
[ 480.008379] [<ffffffff8128212a>] do_filp_open+0x8a/0x100
[ 480.008380] [<ffffffff81871cab>] ? _raw_spin_unlock+0x2b/0x40
[ 480.008382] [<ffffffff8129274f>] ? __alloc_fd+0xaf/0x180
[ 480.008385] [<ffffffff8126f5da>] do_sys_open+0x13a/0x230
[ 480.008386] [<ffffffff8126f6ee>] SyS_open+0x1e/0x20
[ 480.008388] [<ffffffff818727ae>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 480.008389] 1 lock held by pool/4655:
[ 480.008389] #0: (&type->i_mutex_dir_key#4){+.+.+.}, at:
[<ffffffff81280097>] path_openat+0x697/0x12b0
[ 480.008393] INFO: task pool:4775 blocked for more than 120 seconds.
[ 480.008394] Not tainted 4.2.3-300.fc23.x86_64+debug #1
[ 480.008394] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 480.008395] pool D ffff8807fe5d76d8 13176 4775 2015 0x00000000
[ 480.008398] ffff8807f828b908 0000000000000092 ffff8807f828b8d8
0000000000000000
[ 480.008400] ffff8807fa360000 ffff8807f9cd5480 ffff8807f828b928
ffff8807f828c000
[ 480.008401] ffff8806b7939eb0 ffff8807f9cd5480 ffff8807f9cd5480
ffff8807f828b950
[ 480.008403] Call Trace:
[ 480.008404] [<ffffffff8186bc9e>] schedule+0x3e/0x90
[ 480.008410] [<ffffffffa0806352>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
[ 480.008411] [<ffffffff810fbf50>] ? wake_atomic_t_function+0x70/0x70
[ 480.008415] [<ffffffffa0799834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
[ 480.008419] [<ffffffffa079ebbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
[ 480.008421] [<ffffffff813c6e10>] ? crypto_shash_update+0x30/0xe0
[ 480.008426] [<ffffffffa07b8ad8>] btrfs_lookup_dir_item+0x78/0xc0 [btrfs]
[ 480.008432] [<ffffffffa07d4ff2>] btrfs_lookup_dentry+0xb2/0x510 [btrfs]
[ 480.008433] [<ffffffff81871cab>] ? _raw_spin_unlock+0x2b/0x40
[ 480.008438] [<ffffffffa07d5466>] btrfs_lookup+0x16/0x40 [btrfs]
[ 480.008439] [<ffffffff8127f210>] ? walk_component+0x1d0/0x2a0
[ 480.008441] [<ffffffff8127ac9d>] lookup_real+0x1d/0x60
[ 480.008442] [<ffffffff8127bc82>] __lookup_hash+0x42/0x60
[ 480.008443] [<ffffffff8127f21f>] walk_component+0x1df/0x2a0
[ 480.008444] [<ffffffff8127f46e>] link_path_walk+0x18e/0x590
[ 480.008445] [<ffffffff8127ea92>] ? path_init+0x552/0x7f0
[ 480.008446] [<ffffffff8127ea4a>] ? path_init+0x50a/0x7f0
[ 480.008447] [<ffffffff8127faab>] path_openat+0xab/0x12b0
[ 480.008449] [<ffffffff81135b10>] ? clock_was_set_work+0x30/0x30
[ 480.008451] [<ffffffff81026cd8>] ? native_sched_clock+0x28/0x90
[ 480.008452] [<ffffffff8128212a>] do_filp_open+0x8a/0x100
[ 480.008454] [<ffffffff81871cab>] ? _raw_spin_unlock+0x2b/0x40
[ 480.008455] [<ffffffff8129274f>] ? __alloc_fd+0xaf/0x180
[ 480.008457] [<ffffffff8126f5da>] do_sys_open+0x13a/0x230
[ 480.008458] [<ffffffff8126f6ee>] SyS_open+0x1e/0x20
[ 480.008460] [<ffffffff818727ae>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 480.008461] 1 lock held by pool/4775:
[ 480.008462] #0: (&type->i_mutex_dir_key#4){+.+.+.}, at:
[<ffffffff8127f210>] walk_component+0x1d0/0x2a0
My /home partition stored in btrfs after it occurs all programs which
try accessed to /home hangs
--
Best Regards,
Mike Gavrilov.
--
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