and again :'(
[ 360.084133] INFO: task kworker/u16:0:6 blocked for more than 120 seconds.
[ 360.084138] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.084139] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.084140] kworker/u16:0 D ffff8807fe5d76d8 10488 6 2 0x00000000
[ 360.084165] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 360.084168] ffff8807fa7db848 0000000000000096 ffff8807fa7db818
0000000000000000
[ 360.084171] ffff8807fa340000 ffff8807fa7c5480 ffff8807fa7db868
ffff8807fa7dc000
[ 360.084173] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807fa7db890
ffff8807e46f0b48
[ 360.084176] Call Trace:
[ 360.084181] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.084195] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.084199] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.084207] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.084214] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.084217] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.084226] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.084238] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.084241] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
[ 360.084248] [<ffffffffa05783da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 360.084258] [<ffffffffa05a99f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 360.084267] [<ffffffffa05a4cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 360.084277] [<ffffffffa05afcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 360.084281] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.084290] [<ffffffffa05b02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 360.084301] [<ffffffffa05da945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 360.084312] [<ffffffffa05db14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 360.084314] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.084316] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.084319] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.084320] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.084322] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.084324] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.084327] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.084330] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.084333] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.084335] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.084337] 3 locks held by kworker/u16:0/6:
[ 360.084338] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.084343] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.084346] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.084368] INFO: task kworker/u16:1:108 blocked for more than 120 seconds.
[ 360.084369] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.084370] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.084371] kworker/u16:1 D ffff8807fddd76d8 11448 108 2 0x00000000
[ 360.084380] Workqueue: writeback wb_workfn (flush-btrfs-1)
[ 360.084382] ffff8807f531f278 0000000000000096 0000000000000018
0000000000000000
[ 360.084385] ffffffff81e12500 ffff8807f5312a40 ffff8807f531f298
ffff8807f5320000
[ 360.084387] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f531f2c0
ffff8807e46f0b48
[ 360.084390] Call Trace:
[ 360.084392] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.084404] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.084406] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.084413] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.084419] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.084428] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.084438] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.084440] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.084442] [<ffffffff8187283b>] ? _raw_spin_unlock+0x2b/0x40
[ 360.084451] [<ffffffffa05a6c41>] ? start_transaction+0x91/0x6c0 [btrfs]
[ 360.084460] [<ffffffffa05acfe5>] cow_file_range_inline+0x1c5/0x6d0 [btrfs]
[ 360.084471] [<ffffffffa05c5965>] ? __set_extent_bit+0x3f5/0x530 [btrfs]
[ 360.084481] [<ffffffffa05ad84d>] cow_file_range+0x35d/0x450 [btrfs]
[ 360.084492] [<ffffffffa05c71e5>] ? test_range_bit+0xe5/0x130 [btrfs]
[ 360.084500] [<ffffffffa05ae848>] run_delalloc_range+0x3c8/0x400 [btrfs]
[ 360.084511] [<ffffffffa05c7417>] ?
find_lock_delalloc_range.constprop.45+0x1e7/0x210 [btrfs]
[ 360.084526] [<ffffffffa05c7545>]
writepage_delalloc.isra.34+0x105/0x170 [btrfs]
[ 360.084540] [<ffffffffa05c9345>] __extent_writepage+0xf5/0x4a0 [btrfs]
[ 360.084555] [<ffffffffa05c99fa>]
extent_write_cache_pages.isra.31.constprop.43+0x30a/0x400 [btrfs]
[ 360.084560] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.084562] [<ffffffff81026d68>] ? native_sched_clock+0x28/0x90
[ 360.084565] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.084578] [<ffffffffa05cacac>] extent_writepages+0x5c/0x90 [btrfs]
[ 360.084591] [<ffffffffa05ab140>] ?
btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
[ 360.084603] [<ffffffffa05a8aa8>] btrfs_writepages+0x28/0x30 [btrfs]
[ 360.084606] [<ffffffff811f3891>] do_writepages+0x21/0x30
[ 360.084609] [<ffffffff812a4d90>] __writeback_single_inode+0x70/0xa20
[ 360.084612] [<ffffffff812a5f06>] writeback_sb_inodes+0x2d6/0x6d0
[ 360.084615] [<ffffffff812a638c>] __writeback_inodes_wb+0x8c/0xc0
[ 360.084617] [<ffffffff812a678d>] wb_writeback+0x3cd/0x720
[ 360.084621] [<ffffffff814357e5>] ? find_next_bit+0x15/0x20
[ 360.084624] [<ffffffff812a7665>] wb_workfn+0x405/0x8d0
[ 360.084626] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.084628] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.084630] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.084631] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.084633] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.084635] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.084637] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.084640] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.084643] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.084645] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.084647] 4 locks held by kworker/u16:1/108:
[ 360.084648] #0: ("writeback"){.+.+.+}, at: [<ffffffff810cc3ab>]
process_one_work+0x19b/0x840
[ 360.084653] #1: ((&(&wb->dwork)->work)){+.+.+.}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.084657] #2: (&type->s_umount_key#57){.+.+..}, at:
[<ffffffff8127404b>] trylock_super+0x1b/0x50
[ 360.084662] #3: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.084678] INFO: task kworker/u16:2:141 blocked for more than 120 seconds.
[ 360.084680] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.084681] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.084682] kworker/u16:2 D ffff8807fe3d76d8 10696 141 2 0x00000000
[ 360.084700] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 360.084701] ffff8807f4dcb848 0000000000000096 ffff8807f4dcb818
0000000000000000
[ 360.084704] ffff8807fa32d480 ffff8807f9f7d480 ffff8807f4dcb868
ffff8807f4dcc000
[ 360.084707] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4dcb890
ffff8807e46f0b48
[ 360.084710] Call Trace:
[ 360.084713] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.084727] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.084729] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.084738] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.084746] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.084749] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.084760] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.084773] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.084776] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
[ 360.084784] [<ffffffffa05783da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 360.084796] [<ffffffffa05a99f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 360.084808] [<ffffffffa05a4cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 360.084821] [<ffffffffa05afcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 360.084824] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.084836] [<ffffffffa05b02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 360.084850] [<ffffffffa05da945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 360.084864] [<ffffffffa05db14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 360.084866] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.084868] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.084869] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.084871] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.084873] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.084875] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.084878] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.084881] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.084883] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.084885] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.084887] 3 locks held by kworker/u16:2/141:
[ 360.084888] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.084892] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.084896] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.084911] INFO: task kworker/u16:3:142 blocked for more than 120 seconds.
[ 360.084912] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.084913] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.084915] kworker/u16:3 D ffff8807fe1d76d8 11720 142 2 0x00000000
[ 360.084932] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 360.084933] ffff8807f4dcf848 0000000000000096 ffff8807f4dcf818
0000000000000000
[ 360.084936] ffff8807fa32aa40 ffff8807f5295480 ffff8807f4dcf868
ffff8807f4dd0000
[ 360.084939] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4dcf890
ffff8807e46f0b48
[ 360.084942] Call Trace:
[ 360.084944] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.084958] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.084960] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.084969] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.084977] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.084980] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.084991] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.085004] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.085007] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
[ 360.085015] [<ffffffffa05783da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 360.085027] [<ffffffffa05a99f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 360.085039] [<ffffffffa05a4cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 360.085052] [<ffffffffa05afcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 360.085055] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.085067] [<ffffffffa05b02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 360.085081] [<ffffffffa05da945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 360.085121] [<ffffffffa05db14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 360.085125] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.085128] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.085131] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.085133] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.085136] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.085139] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.085142] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.085146] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085149] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.085152] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085155] 3 locks held by kworker/u16:3/142:
[ 360.085157] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085163] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085168] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.085186] INFO: task kworker/u16:4:143 blocked for more than 120 seconds.
[ 360.085188] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.085190] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.085192] kworker/u16:4 D ffff8807fe9d76d8 11800 143 2 0x00000000
[ 360.085212] Workqueue: btrfs-delayed-meta btrfs_delayed_meta_helper [btrfs]
[ 360.085215] ffff8807f4ddb988 0000000000000096 ffff8807f4ddb958
0000000000000000
[ 360.085219] ffff8807fa345480 ffff8807f5290000 ffff8807f4ddb9a8
ffff8807f4ddc000
[ 360.085223] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4ddb9d0
ffff8807e46f0b48
[ 360.085228] Call Trace:
[ 360.085231] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.085246] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.085249] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.085257] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.085266] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.085269] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.085280] [<ffffffffa059a81e>] btrfs_lookup_inode+0x3e/0xc0 [btrfs]
[ 360.085283] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
[ 360.085298] [<ffffffffa0603289>]
__btrfs_update_delayed_inode+0x69/0x210 [btrfs]
[ 360.085310] [<ffffffffa0603fe6>] ?
btrfs_async_run_delayed_root+0x5b6/0x620 [btrfs]
[ 360.085314] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
[ 360.085325] [<ffffffffa0604007>]
btrfs_async_run_delayed_root+0x5d7/0x620 [btrfs]
[ 360.085329] [<ffffffff81026d68>] ? native_sched_clock+0x28/0x90
[ 360.085331] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.085334] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.085347] [<ffffffffa05da9e0>]
btrfs_scrubparity_helper+0x190/0x870 [btrfs]
[ 360.085359] [<ffffffffa05db12e>] btrfs_delayed_meta_helper+0xe/0x10 [btrfs]
[ 360.085362] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.085364] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.085366] [<ffffffff810ccd40>] ? worker_thread+0x2f0/0x450
[ 360.085369] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.085371] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.085374] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.085378] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085381] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.085384] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085386] 4 locks held by kworker/u16:4/143:
[ 360.085388] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085393] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085398] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.085412] #3: (&delayed_node->mutex){+.+...}, at:
[<ffffffffa0603fe6>] btrfs_async_run_delayed_root+0x5b6/0x620 [btrfs]
[ 360.085430] INFO: task kworker/u16:5:144 blocked for more than 120 seconds.
[ 360.085433] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.085434] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.085436] kworker/u16:5 D ffff8807fe9d76d8 11640 144 2 0x00000000
[ 360.085454] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 360.085457] ffff8807f4ddf848 0000000000000096 ffff8807f4ddf818
0000000000000000
[ 360.085462] ffff8807fa345480 ffff8807f5292a40 ffff8807f4ddf868
ffff8807f4de0000
[ 360.085466] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4ddf890
ffff8807e46f0b48
[ 360.085471] Call Trace:
[ 360.085475] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.085489] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.085492] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.085503] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.085513] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.085516] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.085528] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.085542] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.085546] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
[ 360.085554] [<ffffffffa05783da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 360.085567] [<ffffffffa05a99f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 360.085580] [<ffffffffa05a4cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 360.085594] [<ffffffffa05afcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 360.085598] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.085611] [<ffffffffa05b02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 360.085625] [<ffffffffa05da945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 360.085639] [<ffffffffa05db14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 360.085642] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.085645] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.085648] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.085651] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.085654] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.085658] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.085661] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.085666] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085670] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.085673] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085676] 3 locks held by kworker/u16:5/144:
[ 360.085678] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085685] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085691] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.085708] INFO: task kworker/u16:6:145 blocked for more than 120 seconds.
[ 360.085711] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.085712] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.085714] kworker/u16:6 D ffff8807fe5d76d8 10744 145 2 0x00000000
[ 360.085732] Workqueue: btrfs-delayed-meta btrfs_delayed_meta_helper [btrfs]
[ 360.085734] ffff8807f4deb988 0000000000000096 ffff8807f4deb958
0000000000000000
[ 360.085739] ffff8807fa340000 ffff8807f5282a40 ffff8807f4deb9a8
ffff8807f4dec000
[ 360.085744] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4deb9d0
ffff8807e46f0b48
[ 360.085749] Call Trace:
[ 360.085753] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.085767] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.085770] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.085780] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.085790] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.085795] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.085808] [<ffffffffa059a81e>] btrfs_lookup_inode+0x3e/0xc0 [btrfs]
[ 360.085812] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
[ 360.085828] [<ffffffffa0603289>]
__btrfs_update_delayed_inode+0x69/0x210 [btrfs]
[ 360.085842] [<ffffffffa0603fe6>] ?
btrfs_async_run_delayed_root+0x5b6/0x620 [btrfs]
[ 360.085846] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
[ 360.085860] [<ffffffffa0604007>]
btrfs_async_run_delayed_root+0x5d7/0x620 [btrfs]
[ 360.085864] [<ffffffff81026d68>] ? native_sched_clock+0x28/0x90
[ 360.085867] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.085871] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.085885] [<ffffffffa05da9e0>]
btrfs_scrubparity_helper+0x190/0x870 [btrfs]
[ 360.085899] [<ffffffffa05db12e>] btrfs_delayed_meta_helper+0xe/0x10 [btrfs]
[ 360.085903] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.085906] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.085908] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.085911] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.085915] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.085918] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.085921] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.085926] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085930] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.085933] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.085937] 4 locks held by kworker/u16:6/145:
[ 360.085938] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085945] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.085952] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.085969] #3: (&delayed_node->mutex){+.+...}, at:
[<ffffffffa0603fe6>] btrfs_async_run_delayed_root+0x5b6/0x620 [btrfs]
[ 360.085990] INFO: task kworker/u16:7:155 blocked for more than 120 seconds.
[ 360.085993] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.085996] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.085998] kworker/u16:7 D ffff8807fe5d76d8 11304 155 2 0x00000000
[ 360.086016] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 360.086019] ffff8807f4e7b848 0000000000000096 ffff8807f4e7b818
0000000000000000
[ 360.086024] ffff8807fa340000 ffff8807f4e6d480 ffff8807f4e7b868
ffff8807f4e7c000
[ 360.086028] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4e7b890
ffff8807e46f0b48
[ 360.086033] Call Trace:
[ 360.086037] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.086051] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.086055] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.086065] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.086075] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.086079] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.086102] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.086117] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.086122] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
[ 360.086130] [<ffffffffa05783da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 360.086145] [<ffffffffa05a99f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 360.086158] [<ffffffffa05a4cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 360.086172] [<ffffffffa05afcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 360.086176] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.086189] [<ffffffffa05b02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 360.086204] [<ffffffffa05da945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 360.086218] [<ffffffffa05db14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 360.086221] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.086224] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.086228] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.086231] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.086235] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.086238] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.086241] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.086246] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.086250] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.086253] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.086256] 3 locks held by kworker/u16:7/155:
[ 360.086258] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.086265] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.086271] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.086290] INFO: task kworker/u16:8:192 blocked for more than 120 seconds.
[ 360.086293] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.086294] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.086297] kworker/u16:8 D ffff8807fe1d76d8 11304 192 2 0x00000000
[ 360.086316] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
[ 360.086318] ffff8807f4f3f848 0000000000000096 ffff8807f4f3f818
0000000000000000
[ 360.086323] ffff8807fa32aa40 ffff8807f4e6aa40 ffff8807f4f3f868
ffff8807f4f40000
[ 360.086328] ffff8807e46f0b90 ffff8807e46f0be8 ffff8807f4f3f890
ffff8807e46f0b48
[ 360.086333] Call Trace:
[ 360.086337] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.086353] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.086357] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.086367] [<ffffffffa0578884>] btrfs_lock_root_node+0x34/0x50 [btrfs]
[ 360.086377] [<ffffffffa057dd75>] btrfs_search_slot+0x905/0xa10 [btrfs]
[ 360.086381] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
[ 360.086394] [<ffffffffa05988d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
[ 360.086409] [<ffffffffa05bb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
[ 360.086413] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
[ 360.086422] [<ffffffffa05783da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
[ 360.086436] [<ffffffffa05a99f5>]
insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
[ 360.086449] [<ffffffffa05a4cbe>] ?
join_transaction.isra.12+0x10e/0x420 [btrfs]
[ 360.086463] [<ffffffffa05afcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
[ 360.086468] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.086480] [<ffffffffa05b02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
[ 360.086495] [<ffffffffa05da945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
[ 360.086510] [<ffffffffa05db14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
[ 360.086513] [<ffffffff810cc442>] process_one_work+0x232/0x840
[ 360.086517] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
[ 360.086520] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
[ 360.086522] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
[ 360.086527] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
[ 360.086530] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
[ 360.086534] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.086538] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.086542] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.086546] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.086549] 3 locks held by kworker/u16:8/192:
[ 360.086551] #0: ("%s-%s""btrfs", name){.+.+..}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.086558] #1: ((&work->normal_work)){+.+...}, at:
[<ffffffff810cc3ab>] process_one_work+0x19b/0x840
[ 360.086564] #2: (sb_internal){.+.+..}, at: [<ffffffffa05a6fcc>]
start_transaction+0x41c/0x6c0 [btrfs]
[ 360.086594] INFO: task btrfs-transacti:785 blocked for more than 120 seconds.
[ 360.086597] Not tainted 4.2.5-300.fc23.x86_64+debug #1
[ 360.086599] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[ 360.086601] btrfs-transacti D ffff8807fe1d76d8 10632 785 2 0x00000080
[ 360.086607] ffff88003ec63ac8 0000000000000092 ffff88003ec63a98
0000000000000000
[ 360.086612] ffff8807fa32aa40 ffff8807ecadaa40 ffff88003ec63ae8
ffff88003ec64000
[ 360.086617] ffff88079eb78970 ffff88079eb789c8 ffff88003ec63b10
ffff88079eb78928
[ 360.086622] Call Trace:
[ 360.086626] [<ffffffff8186c82e>] schedule+0x3e/0x90
[ 360.086642] [<ffffffffa05e589d>] btrfs_tree_lock+0x7d/0x270 [btrfs]
[ 360.086646] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
[ 360.086657] [<ffffffffa057db68>] btrfs_search_slot+0x6f8/0xa10 [btrfs]
[ 360.086661] [<ffffffff8186f689>] ? mutex_lock_nested+0x279/0x3e0
[ 360.086676] [<ffffffffa060352c>] ?
__btrfs_run_delayed_items+0xfc/0x600 [btrfs]
[ 360.086687] [<ffffffffa057f7c1>] btrfs_insert_empty_items+0x71/0xc0 [btrfs]
[ 360.086690] [<ffffffff8187009e>] ? mutex_unlock+0xe/0x10
[ 360.086705] [<ffffffffa0603565>]
__btrfs_run_delayed_items+0x135/0x600 [btrfs]
[ 360.086709] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
[ 360.086724] [<ffffffffa0604083>] btrfs_run_delayed_items+0x13/0x20 [btrfs]
[ 360.086738] [<ffffffffa05a6220>]
btrfs_commit_transaction+0x2f0/0xc80 [btrfs]
[ 360.086751] [<ffffffffa05a11a8>] transaction_kthread+0x208/0x270 [btrfs]
[ 360.086764] [<ffffffffa05a0fa0>] ?
btrfs_cleanup_transaction+0x6e0/0x6e0 [btrfs]
[ 360.086767] [<ffffffff810d36e4>] kthread+0x104/0x120
[ 360.086772] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.086776] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
[ 360.086780] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
[ 360.086783] 2 locks held by btrfs-transacti/785:
[ 360.086785] #0: (&fs_info->transaction_kthread_mutex){+.+...},
at: [<ffffffffa05a1012>] transaction_kthread+0x72/0x270 [btrfs]
[ 360.086800] #1: (&delayed_node->mutex){+.+...}, at:
[<ffffffffa060352c>] __btrfs_run_delayed_items+0xfc/0x600 [btrfs]
--
Best Regards,
Mike Gavrilov.
2015-11-03 17:48 GMT+05:00 Михаил Гаврилов <mikhail.v.gavrilov@xxxxxxxxx>:
> Hi!
> please, help me.
>
>
> [ 479.827555] INFO: task kworker/u16:2:140 blocked for more than 120 seconds.
> [ 479.827558] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.827559] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.827560] kworker/u16:2 D ffff8807fe3d76d8 11800 140 2 0x00000000
> [ 479.827578] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> [ 479.827579] ffff88009c56b848 0000000000000096 ffff88009c56b818
> 0000000000000000
> [ 479.827581] ffff8807fa32d480 ffff8807f531d480 ffff88009c56b868
> ffff88009c56c000
> [ 479.827583] ffff8806c347d1f0 ffff8807f531d480 ffff8807f531d480
> ffff88009c56b890
> [ 479.827585] Call Trace:
> [ 479.827588] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.827597] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.827600] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.827604] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.827608] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.827610] [<ffffffff81109149>] ? __lock_acquire+0xcb9/0x1d00
> [ 479.827616] [<ffffffffa07a88d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
> [ 479.827622] [<ffffffffa07cb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
> [ 479.827625] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
> [ 479.827628] [<ffffffffa07883da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
> [ 479.827634] [<ffffffffa07b99f5>]
> insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
> [ 479.827639] [<ffffffffa07b4cbe>] ?
> join_transaction.isra.12+0x10e/0x420 [btrfs]
> [ 479.827645] [<ffffffffa07bfcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
> [ 479.827647] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.827652] [<ffffffffa07c02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
> [ 479.827659] [<ffffffffa07ea945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
> [ 479.827665] [<ffffffffa07eb14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
> [ 479.827667] [<ffffffff810cc442>] process_one_work+0x232/0x840
> [ 479.827668] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
> [ 479.827669] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.827670] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
> [ 479.827672] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
> [ 479.827673] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
> [ 479.827674] [<ffffffff810d36e4>] kthread+0x104/0x120
> [ 479.827676] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.827678] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
> [ 479.827679] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.827680] 3 locks held by kworker/u16:2/140:
> [ 479.827681] #0: ("%s-%s""btrfs", name){.+.+..}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.827684] #1: ((&work->normal_work)){+.+...}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.827687] #2: (sb_internal){.+.+..}, at: [<ffffffffa07b6fcc>]
> start_transaction+0x41c/0x6c0 [btrfs]
> [ 479.827694] INFO: task kworker/u16:3:141 blocked for more than 120 seconds.
> [ 479.827695] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.827695] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.827696] kworker/u16:3 D ffff8807fe1d76d8 11240 141 2 0x00000000
> [ 479.827705] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> [ 479.827706] ffff88009c56f848 0000000000000096 ffff88009c56f818
> 0000000000000000
> [ 479.827708] ffff8807fa32aa40 ffff8807f5318000 ffff88009c56f868
> ffff88009c570000
> [ 479.827709] ffff8806c347d1f0 ffff8807f5318000 ffff8807f5318000
> ffff88009c56f890
> [ 479.827711] Call Trace:
> [ 479.827712] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.827719] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.827720] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.827724] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.827728] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.827729] [<ffffffff81109149>] ? __lock_acquire+0xcb9/0x1d00
> [ 479.827735] [<ffffffffa07a88d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
> [ 479.827741] [<ffffffffa07cb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
> [ 479.827742] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
> [ 479.827746] [<ffffffffa07883da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
> [ 479.827751] [<ffffffffa07b99f5>]
> insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
> [ 479.827756] [<ffffffffa07b4cbe>] ?
> join_transaction.isra.12+0x10e/0x420 [btrfs]
> [ 479.827761] [<ffffffffa07bfcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
> [ 479.827763] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.827768] [<ffffffffa07c02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
> [ 479.827774] [<ffffffffa07ea945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
> [ 479.827779] [<ffffffffa07eb14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
> [ 479.827780] [<ffffffff810cc442>] process_one_work+0x232/0x840
> [ 479.827781] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
> [ 479.827782] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.827783] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
> [ 479.827785] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
> [ 479.827786] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
> [ 479.827787] [<ffffffff810d36e4>] kthread+0x104/0x120
> [ 479.827789] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.827790] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
> [ 479.827792] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.827793] 3 locks held by kworker/u16:3/141:
> [ 479.827793] #0: ("%s-%s""btrfs", name){.+.+..}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.827796] #1: ((&work->normal_work)){+.+...}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.827798] #2: (sb_internal){.+.+..}, at: [<ffffffffa07b6fcc>]
> start_transaction+0x41c/0x6c0 [btrfs]
> [ 479.827806] INFO: task kworker/u16:7:155 blocked for more than 120 seconds.
> [ 479.827806] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.827807] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.827808] kworker/u16:7 D ffff8807fdfd76d8 11800 155 2 0x00000000
> [ 479.827816] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> [ 479.827816] ffff8807f4ee7848 0000000000000096 ffff8807f4ee7818
> 0000000000000000
> [ 479.827818] ffff8807fa328000 ffff8807f4edaa40 ffff8807f4ee7868
> ffff8807f4ee8000
> [ 479.827820] ffff8806c347d1f0 ffff8807f4edaa40 ffff8807f4edaa40
> ffff8807f4ee7890
> [ 479.827821] Call Trace:
> [ 479.827823] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.827829] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.827830] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.827834] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.827838] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.827839] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
> [ 479.827844] [<ffffffffa07a88d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
> [ 479.827850] [<ffffffffa07cb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
> [ 479.827851] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
> [ 479.827855] [<ffffffffa07883da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
> [ 479.827860] [<ffffffffa07b99f5>]
> insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
> [ 479.827865] [<ffffffffa07b4cbe>] ?
> join_transaction.isra.12+0x10e/0x420 [btrfs]
> [ 479.827870] [<ffffffffa07bfcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
> [ 479.827872] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.827876] [<ffffffffa07c02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
> [ 479.827882] [<ffffffffa07ea945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
> [ 479.827888] [<ffffffffa07eb14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
> [ 479.827889] [<ffffffff810cc442>] process_one_work+0x232/0x840
> [ 479.827890] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
> [ 479.827891] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.827892] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
> [ 479.827893] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
> [ 479.827894] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
> [ 479.827895] [<ffffffff810d36e4>] kthread+0x104/0x120
> [ 479.827897] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.827898] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
> [ 479.827900] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.827901] 3 locks held by kworker/u16:7/155:
> [ 479.827901] #0: ("%s-%s""btrfs", name){.+.+..}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.827904] #1: ((&work->normal_work)){+.+...}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.827906] #2: (sb_internal){.+.+..}, at: [<ffffffffa07b6fcc>]
> start_transaction+0x41c/0x6c0 [btrfs]
> [ 479.827913] INFO: task kworker/u16:8:193 blocked for more than 120 seconds.
> [ 479.827913] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.827914] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.827915] kworker/u16:8 D ffff8807fddd76d8 12760 193 2 0x00000000
> [ 479.827923] Workqueue: btrfs-endio-write btrfs_endio_write_helper [btrfs]
> [ 479.827924] ffff88009c6af848 0000000000000096 ffff88009c6af818
> 0000000000000000
> [ 479.827925] ffff8807f4fb0000 ffff8807f4f92a40 ffff88009c6af868
> ffff88009c6b0000
> [ 479.827927] ffff8806c347d1f0 ffff8807f4f92a40 ffff8807f4f92a40
> ffff88009c6af890
> [ 479.827928] Call Trace:
> [ 479.827930] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.827935] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.827937] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.827940] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.827944] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.827946] [<ffffffff81109149>] ? __lock_acquire+0xcb9/0x1d00
> [ 479.827951] [<ffffffffa07a88d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
> [ 479.827956] [<ffffffffa07cb037>] __btrfs_drop_extents+0x187/0xde0 [btrfs]
> [ 479.827958] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
> [ 479.827961] [<ffffffffa07883da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
> [ 479.827966] [<ffffffffa07b99f5>]
> insert_reserved_file_extent.constprop.62+0xb5/0x310 [btrfs]
> [ 479.827971] [<ffffffffa07b4cbe>] ?
> join_transaction.isra.12+0x10e/0x420 [btrfs]
> [ 479.827976] [<ffffffffa07bfcbf>] btrfs_finish_ordered_io+0x2ff/0x650 [btrfs]
> [ 479.827978] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.827982] [<ffffffffa07c02a5>] finish_ordered_fn+0x15/0x20 [btrfs]
> [ 479.827988] [<ffffffffa07ea945>] btrfs_scrubparity_helper+0xf5/0x870 [btrfs]
> [ 479.827994] [<ffffffffa07eb14e>] btrfs_endio_write_helper+0xe/0x10 [btrfs]
> [ 479.827995] [<ffffffff810cc442>] process_one_work+0x232/0x840
> [ 479.827996] [<ffffffff810cc3ab>] ? process_one_work+0x19b/0x840
> [ 479.827997] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.827998] [<ffffffff810ccb25>] ? worker_thread+0xd5/0x450
> [ 479.827999] [<ffffffff810cca9e>] worker_thread+0x4e/0x450
> [ 479.828000] [<ffffffff810cca50>] ? process_one_work+0x840/0x840
> [ 479.828002] [<ffffffff810d36e4>] kthread+0x104/0x120
> [ 479.828004] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.828005] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
> [ 479.828006] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.828007] 3 locks held by kworker/u16:8/193:
> [ 479.828008] #0: ("%s-%s""btrfs", name){.+.+..}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.828010] #1: ((&work->normal_work)){+.+...}, at:
> [<ffffffff810cc3ab>] process_one_work+0x19b/0x840
> [ 479.828013] #2: (sb_internal){.+.+..}, at: [<ffffffffa07b6fcc>]
> start_transaction+0x41c/0x6c0 [btrfs]
> [ 479.828026] INFO: task btrfs-transacti:808 blocked for more than 120 seconds.
> [ 479.828027] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.828027] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.828028] btrfs-transacti D ffff8807fe1d76d8 10632 808 2 0x00000080
> [ 479.828031] ffff8807e3687a48 0000000000000096 ffff8807e3687a18
> 0000000000000000
> [ 479.828032] ffff8807fa32aa40 ffff8807f74e2a40 ffff8807e3687a68
> ffff8807e3688000
> [ 479.828034] ffff8806c347d1f0 ffff8807f74e2a40 ffff8807f74e2a40
> ffff8807e3687a90
> [ 479.828036] Call Trace:
> [ 479.828037] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.828043] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.828044] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.828048] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.828052] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.828058] [<ffffffffa0812c72>] ?
> btrfs_delete_delayed_items+0x92/0x330 [btrfs]
> [ 479.828064] [<ffffffffa0812cb8>]
> btrfs_delete_delayed_items+0xd8/0x330 [btrfs]
> [ 479.828066] [<ffffffff81108099>] ? trace_hardirqs_on_caller+0x129/0x1b0
> [ 479.828067] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
> [ 479.828072] [<ffffffffa0813934>]
> __btrfs_run_delayed_items+0x504/0x600 [btrfs]
> [ 479.828074] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.828080] [<ffffffffa0814083>] btrfs_run_delayed_items+0x13/0x20 [btrfs]
> [ 479.828085] [<ffffffffa07b6220>]
> btrfs_commit_transaction+0x2f0/0xc80 [btrfs]
> [ 479.828090] [<ffffffffa07b11a8>] transaction_kthread+0x208/0x270 [btrfs]
> [ 479.828095] [<ffffffffa07b0fa0>] ?
> btrfs_cleanup_transaction+0x6e0/0x6e0 [btrfs]
> [ 479.828096] [<ffffffff810d36e4>] kthread+0x104/0x120
> [ 479.828098] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.828099] [<ffffffff8187375f>] ret_from_fork+0x3f/0x70
> [ 479.828101] [<ffffffff810d35e0>] ? kthread_create_on_node+0x250/0x250
> [ 479.828102] 2 locks held by btrfs-transacti/808:
> [ 479.828102] #0: (&fs_info->transaction_kthread_mutex){+.+...},
> at: [<ffffffffa07b1012>] transaction_kthread+0x72/0x270 [btrfs]
> [ 479.828108] #1: (&delayed_node->mutex){+.+...}, at:
> [<ffffffffa0812c72>] btrfs_delete_delayed_items+0x92/0x330 [btrfs]
> [ 479.828140] INFO: task gnome-shell:2200 blocked for more than 120 seconds.
> [ 479.828141] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.828141] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.828142] gnome-shell D ffff8807fddd76d8 11688 2200 1986 0x00000000
> [ 479.828145] ffff880098157c48 0000000000000096 ffff880098157c18
> 0000000000000000
> [ 479.828146] ffffffff81e12500 ffff8807b5e42a40 ffff880098157c68
> ffff880098158000
> [ 479.828148] ffff8806c347d1f0 ffff8807b5e42a40 ffff8807b5e42a40
> ffff880098157c90
> [ 479.828150] Call Trace:
> [ 479.828151] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.828157] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.828158] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.828162] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.828166] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.828167] [<ffffffff8187283b>] ? _raw_spin_unlock+0x2b/0x40
> [ 479.828173] [<ffffffffa07ba999>] btrfs_real_readdir+0xe9/0x590 [btrfs]
> [ 479.828175] [<ffffffff81285ee7>] iterate_dir+0x97/0x130
> [ 479.828176] [<ffffffff812921fa>] ? __fget_light+0x2a/0x90
> [ 479.828178] [<ffffffff81286421>] SyS_getdents+0x91/0x120
> [ 479.828179] [<ffffffff81286080>] ? fillonedir+0x100/0x100
> [ 479.828180] [<ffffffff8187332e>] entry_SYSCALL_64_fastpath+0x12/0x76
> [ 479.828182] 1 lock held by gnome-shell/2200:
> [ 479.828182] #0: (&type->i_mutex_dir_key#4){+.+.+.}, at:
> [<ffffffff81285eb1>] iterate_dir+0x61/0x130
> [ 479.828192] INFO: task tracker-store:2392 blocked for more than 120 seconds.
> [ 479.828192] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.828193] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.828193] tracker-store D ffff8807febd76d8 10760 2392 1 0x00000000
> [ 479.828196] ffff8807ac59f678 0000000000000096 ffff8807ac59f648
> 0000000000000000
> [ 479.828198] ffff8807fa358000 ffff8807ada62a40 ffff8807ac59f698
> ffff8807ac5a0000
> [ 479.828200] ffff8806c347d1f0 ffff8807ada62a40 ffff8807ada62a40
> ffff8807ac59f6c0
> [ 479.828201] Call Trace:
> [ 479.828202] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.828208] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.828209] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.828213] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.828217] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.828222] [<ffffffffa07a88d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
> [ 479.828227] [<ffffffffa07bb2ab>] btrfs_get_extent+0x16b/0xc40 [btrfs]
> [ 479.828228] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.828230] [<ffffffff8187283b>] ? _raw_spin_unlock+0x2b/0x40
> [ 479.828236] [<ffffffffa07d9cb2>] __do_readpage+0x1c2/0x940 [btrfs]
> [ 479.828237] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.828239] [<ffffffff810e7e3c>] ? local_clock+0x1c/0x20
> [ 479.828240] [<ffffffff818728c0>] ? _raw_spin_unlock_irq+0x30/0x50
> [ 479.828246] [<ffffffffa07bb140>] ?
> btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
> [ 479.828247] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
> [ 479.828253] [<ffffffffa07da7f4>]
> __extent_readpages.constprop.40+0x2c4/0x2e0 [btrfs]
> [ 479.828255] [<ffffffff811e3118>] ? __add_to_page_cache_locked+0x408/0x470
> [ 479.828260] [<ffffffffa07bb140>] ?
> btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
> [ 479.828266] [<ffffffffa07daebe>] extent_readpages+0x1de/0x1f0 [btrfs]
> [ 479.828271] [<ffffffffa07bb140>] ?
> btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
> [ 479.828272] [<ffffffff811e1eb5>] ? __page_cache_alloc+0x135/0x150
> [ 479.828274] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.828275] [<ffffffff811e1eb5>] ? __page_cache_alloc+0x135/0x150
> [ 479.828280] [<ffffffffa07b8a6f>] btrfs_readpages+0x1f/0x30 [btrfs]
> [ 479.828281] [<ffffffff811f427f>] __do_page_cache_readahead+0x2af/0x330
> [ 479.828282] [<ffffffff811f414d>] ? __do_page_cache_readahead+0x17d/0x330
> [ 479.828284] [<ffffffff81026d68>] ? native_sched_clock+0x28/0x90
> [ 479.828285] [<ffffffff811f456b>] ondemand_readahead+0x26b/0x460
> [ 479.828286] [<ffffffff811f4447>] ? ondemand_readahead+0x147/0x460
> [ 479.828288] [<ffffffff811f4881>] page_cache_sync_readahead+0x31/0x50
> [ 479.828289] [<ffffffff811e450e>] generic_file_read_iter+0x4fe/0x610
> [ 479.828291] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
> [ 479.828292] [<ffffffff8126fd5c>] __vfs_read+0xcc/0x100
> [ 479.828294] [<ffffffff8127067a>] vfs_read+0x8a/0x140
> [ 479.828295] [<ffffffff81271428>] SyS_read+0x58/0xd0
> [ 479.828296] [<ffffffff8187332e>] entry_SYSCALL_64_fastpath+0x12/0x76
> [ 479.828298] 1 lock held by tracker-store/2392:
> [ 479.828298] #0: (&f->f_pos_lock){+.+.+.}, at:
> [<ffffffff81293089>] __fdget_pos+0x49/0x50
> [ 479.828308] INFO: task firefox:2910 blocked for more than 120 seconds.
> [ 479.828309] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.828310] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.828310] firefox D ffff8807fddd76d8 11200 2910 2736 0x00000004
> [ 479.828313] ffff8807808179f8 0000000000000092 ffff8807808179c8
> 0000000000000000
> [ 479.828315] ffffffff81e12500 ffff8800983c5480 ffff880780817a18
> ffff880780818000
> [ 479.828316] ffff8806c347d1f0 ffff8800983c5480 ffff8800983c5480
> ffff880780817a40
> [ 479.828318] Call Trace:
> [ 479.828319] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.828325] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.828327] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.828330] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.828334] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.828337] [<ffffffff813c7020>] ? crypto_shash_update+0x30/0xe0
> [ 479.828342] [<ffffffffa07a7ad8>] btrfs_lookup_dir_item+0x78/0xc0 [btrfs]
> [ 479.828347] [<ffffffffa07c4022>] btrfs_lookup_dentry+0xb2/0x510 [btrfs]
> [ 479.828349] [<ffffffff8187283b>] ? _raw_spin_unlock+0x2b/0x40
> [ 479.828354] [<ffffffffa07c4496>] btrfs_lookup+0x16/0x40 [btrfs]
> [ 479.828355] [<ffffffff8127f3f0>] ? walk_component+0x1d0/0x2a0
> [ 479.828356] [<ffffffff8127ae3d>] lookup_real+0x1d/0x60
> [ 479.828357] [<ffffffff8127be22>] __lookup_hash+0x42/0x60
> [ 479.828359] [<ffffffff8127f3ff>] walk_component+0x1df/0x2a0
> [ 479.828360] [<ffffffff8127ec72>] ? path_init+0x552/0x7f0
> [ 479.828361] [<ffffffff8127ec2a>] ? path_init+0x50a/0x7f0
> [ 479.828363] [<ffffffff8144091d>] ? debug_check_no_obj_freed+0xbd/0x250
> [ 479.828364] [<ffffffff8127fb2d>] path_lookupat+0x5d/0x110
> [ 479.828365] [<ffffffff812816e9>] filename_lookup+0xa9/0x180
> [ 479.828367] [<ffffffff8124d09e>] ? kmem_cache_alloc+0x33e/0x360
> [ 479.828368] [<ffffffff812812f6>] ? getname_flags+0x56/0x1f0
> [ 479.828369] [<ffffffff8128189a>] user_path_at_empty+0x3a/0x50
> [ 479.828371] [<ffffffff8126e959>] SyS_access+0xb9/0x250
> [ 479.828373] [<ffffffff81003044>] ? lockdep_sys_exit_thunk+0x12/0x14
> [ 479.828374] [<ffffffff8187332e>] entry_SYSCALL_64_fastpath+0x12/0x76
> [ 479.828375] 1 lock held by firefox/2910:
> [ 479.828376] #0: (&type->i_mutex_dir_key#4){+.+.+.}, at:
> [<ffffffff8127f3f0>] walk_component+0x1d0/0x2a0
> [ 479.828381] INFO: task Cache2 I/O:2943 blocked for more than 120 seconds.
> [ 479.828382] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.828382] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.828383] Cache2 I/O D ffff8807fe9d76d8 11384 2943 2736 0x00000000
> [ 479.828386] ffff880092ad3678 0000000000000096 ffff880092ad3648
> 0000000000000000
> [ 479.828387] ffff8807fa345480 ffff88009618d480 ffff880092ad3698
> ffff880092ad4000
> [ 479.828389] ffff8806c347d1f0 ffff88009618d480 ffff88009618d480
> ffff880092ad36c0
> [ 479.828390] Call Trace:
> [ 479.828392] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.828397] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.828399] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.828402] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.828406] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.828411] [<ffffffffa07a88d9>] btrfs_lookup_file_extent+0x49/0x60 [btrfs]
> [ 479.828416] [<ffffffffa07bb2ab>] btrfs_get_extent+0x16b/0xc40 [btrfs]
> [ 479.828417] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.828419] [<ffffffff8187283b>] ? _raw_spin_unlock+0x2b/0x40
> [ 479.828425] [<ffffffffa07d9cb2>] __do_readpage+0x1c2/0x940 [btrfs]
> [ 479.828426] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.828428] [<ffffffff810e7e3c>] ? local_clock+0x1c/0x20
> [ 479.828429] [<ffffffff818728c0>] ? _raw_spin_unlock_irq+0x30/0x50
> [ 479.828434] [<ffffffffa07bb140>] ?
> btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
> [ 479.828436] [<ffffffff8110812d>] ? trace_hardirqs_on+0xd/0x10
> [ 479.828442] [<ffffffffa07da7f4>]
> __extent_readpages.constprop.40+0x2c4/0x2e0 [btrfs]
> [ 479.828443] [<ffffffff811e3118>] ? __add_to_page_cache_locked+0x408/0x470
> [ 479.828448] [<ffffffffa07bb140>] ?
> btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
> [ 479.828454] [<ffffffffa07daebe>] extent_readpages+0x1de/0x1f0 [btrfs]
> [ 479.828459] [<ffffffffa07bb140>] ?
> btrfs_writepage_end_io_hook+0x300/0x300 [btrfs]
> [ 479.828460] [<ffffffff81026dd9>] ? sched_clock+0x9/0x10
> [ 479.828461] [<ffffffff810e7e3c>] ? local_clock+0x1c/0x20
> [ 479.828462] [<ffffffff8112858d>] ? debug_lockdep_rcu_enabled+0x1d/0x20
> [ 479.828465] [<ffffffff81426220>] ? __radix_tree_lookup+0xc0/0x110
> [ 479.828469] [<ffffffffa07b8a6f>] btrfs_readpages+0x1f/0x30 [btrfs]
> [ 479.828471] [<ffffffff811f427f>] __do_page_cache_readahead+0x2af/0x330
> [ 479.828472] [<ffffffff811f414d>] ? __do_page_cache_readahead+0x17d/0x330
> [ 479.828473] [<ffffffff810e7e3c>] ? local_clock+0x1c/0x20
> [ 479.828474] [<ffffffff811f43e3>] ondemand_readahead+0xe3/0x460
> [ 479.828476] [<ffffffff811e325d>] ? pagecache_get_page+0x2d/0x200
> [ 479.828477] [<ffffffff811f4881>] page_cache_sync_readahead+0x31/0x50
> [ 479.828478] [<ffffffff811e450e>] generic_file_read_iter+0x4fe/0x610
> [ 479.828480] [<ffffffff81107f3d>] ? mark_held_locks+0x7d/0xb0
> [ 479.828481] [<ffffffff8126fd5c>] __vfs_read+0xcc/0x100
> [ 479.828482] [<ffffffff8127067a>] vfs_read+0x8a/0x140
> [ 479.828483] [<ffffffff81271428>] SyS_read+0x58/0xd0
> [ 479.828485] [<ffffffff8187332e>] entry_SYSCALL_64_fastpath+0x12/0x76
> [ 479.828486] 1 lock held by Cache2 I/O/2943:
> [ 479.828486] #0: (&f->f_pos_lock){+.+.+.}, at:
> [<ffffffff81293089>] __fdget_pos+0x49/0x50
> [ 479.828491] INFO: task mozStorage #2:3046 blocked for more than 120 seconds.
> [ 479.828492] Not tainted 4.2.5-300.fc23.x86_64+debug #1
> [ 479.828493] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [ 479.828493] mozStorage #2 D ffff8807fe7d76d8 12904 3046 2736 0x00000000
> [ 479.828497] ffff880779b0fb68 0000000000000092 ffff880779b0fb38
> 0000000000000000
> [ 479.828498] ffff8807fa342a40 ffff880779898000 ffff880779b0fb88
> ffff880779b10000
> [ 479.828500] ffff8806c347d1f0 ffff880779898000 ffff880779898000
> ffff880779b0fbb0
> [ 479.828502] Call Trace:
> [ 479.828503] [<ffffffff8186c82e>] schedule+0x3e/0x90
> [ 479.828509] [<ffffffffa07f54f2>] btrfs_tree_read_lock+0x102/0x160 [btrfs]
> [ 479.828510] [<ffffffff810fbf60>] ? wake_atomic_t_function+0x70/0x70
> [ 479.828514] [<ffffffffa0788834>] btrfs_read_lock_root_node+0x34/0x50 [btrfs]
> [ 479.828518] [<ffffffffa078dbbe>] btrfs_search_slot+0x74e/0xa10 [btrfs]
> [ 479.828522] [<ffffffffa078f7c1>] btrfs_insert_empty_items+0x71/0xc0 [btrfs]
> [ 479.828525] [<ffffffffa07883da>] ? btrfs_alloc_path+0x1a/0x20 [btrfs]
> [ 479.828531] [<ffffffffa07f5be7>] btrfs_insert_orphan_item+0x67/0xa0 [btrfs]
> [ 479.828560] [<ffffffffa07bc668>] btrfs_orphan_add+0xc8/0x1e0 [btrfs]
> [ 479.828566] [<ffffffffa07c29ca>] btrfs_setattr+0x1aa/0x360 [btrfs]
> [ 479.828567] [<ffffffff81291425>] notify_change+0x245/0x360
> [ 479.828569] [<ffffffff8126e1a7>] do_truncate+0x77/0xc0
> [ 479.828571] [<ffffffff8126e4fd>] ? do_sys_ftruncate.constprop.13+0xdd/0x160
> [ 479.828572] [<ffffffff8126e532>] do_sys_ftruncate.constprop.13+0x112/0x160
> [ 479.828574] [<ffffffff81003044>] ? lockdep_sys_exit_thunk+0x12/0x14
> [ 479.828576] [<ffffffff8126e5be>] SyS_ftruncate+0xe/0x10
> [ 479.828577] [<ffffffff8187332e>] entry_SYSCALL_64_fastpath+0x12/0x76
> [ 479.828579] 3 locks held by mozStorage #2/3046:
> [ 479.828579] #0: (sb_writers#16){.+.+.+}, at: [<ffffffff8126e4fd>]
> do_sys_ftruncate.constprop.13+0xdd/0x160
> [ 479.828582] #1: (&sb->s_type->i_mutex_key#19){+.+.+.}, at:
> [<ffffffff8126e199>] do_truncate+0x69/0xc0
> [ 479.828586] #2: (sb_internal){.+.+..}, at: [<ffffffffa07b6fcc>]
> start_transaction+0x41c/0x6c0 [btrfs]
> [ 502.886801] [drm:drm_mode_addfb2] [FB:72]
> [ 502.886815] [drm:drm_mode_setcrtc] [CRTC:21]
>
>
> --
> Best Regards,
> Mike Gavrilov.
--
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