btrfs blocked for more than 120 seconds

[15121.101915] INFO: task loop0:1345 blocked for more than 120 seconds.
[15121.102980] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15121.104029] loop0           D 0000000100431764     0  1345      2 0x00000000
[15121.105083]  ffff8801f93f9b30 0000000000000046 0000000000000000 0000000000000000
[15121.106163]  ffff880201a49c80 ffff8801f93f9fd8 ffff8801f93f9fd8 ffff8801f93f9fd8
[15121.107225]  ffff880202cb4e60 ffff880201a49c80 0000000000000002 ffff8801f93f9b78
[15121.108289] Call Trace:
[15121.109343]  [<ffffffff81102e35>] ? find_get_pages_tag+0x125/0x150
[15121.110385]  [<ffffffff8110f6c5>] ? pagevec_lookup_tag+0x25/0x40
[15121.111427]  [<ffffffff8101d639>] ? read_tsc+0x9/0x20
[15121.112481]  [<ffffffff81103140>] ? __lock_page+0x70/0x70
[15121.113524]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15121.114566]  [<ffffffff8141596f>] io_schedule+0x8f/0xd0
[15121.115626]  [<ffffffff8110314e>] sleep_on_page+0xe/0x20
[15121.116677]  [<ffffffff8141611f>] __wait_on_bit+0x5f/0x90
[15121.117730]  [<ffffffff81103338>] wait_on_page_bit+0x78/0x80
[15121.118800]  [<ffffffff81086890>] ? autoremove_wake_function+0x40/0x40
[15121.119863]  [<ffffffff811034ac>] filemap_fdatawait_range+0x10c/0x1a0
[15121.120921]  [<ffffffff811044e8>] filemap_write_and_wait_range+0x68/0x80
[15121.121999]  [<ffffffffa03db244>] xfs_file_fsync+0x54/0x340 [xfs]
[15121.123049]  [<ffffffff81192b2b>] vfs_fsync+0x2b/0x40
[15121.124090]  [<ffffffffa01eecf2>] do_bio_filebacked+0x1b2/0x320 [loop]
[15121.125144]  [<ffffffffa0552901>] ? btrfs_end_bio+0x81/0xe0 [btrfs]
[15121.126220]  [<ffffffffa05280cc>] ? end_workqueue_bio+0x9c/0xa0 [btrfs]
[15121.127278]  [<ffffffffa01eef1b>] loop_thread+0xbb/0x260 [loop]
[15121.128337]  [<ffffffff81086850>] ? abort_exclusive_wait+0xb0/0xb0
[15121.129414]  [<ffffffffa01eee60>] ? do_bio_filebacked+0x320/0x320 [loop]
[15121.130484]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15121.131547]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15121.132629]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15121.133691]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15121.134753] INFO: task btrfs-transacti:1386 blocked for more than 120 seconds.
[15121.135850] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15121.136942] btrfs-transacti D 000000010043147a     0  1386      2 0x00000000
[15121.138041]  ffff8801dbf47bc0 0000000000000046 ffffffffa054ae80 ffff880200978300
[15121.139143]  ffff8801f94f4e60 ffff8801dbf47fd8 ffff8801dbf47fd8 ffff8801dbf47fd8
[15121.140214]  ffff880202cb4e60 ffff8801f94f4e60 ffff8801dbf47af0 ffffffff8101dbb9
[15121.141284] Call Trace:
[15121.142362]  [<ffffffffa054ae80>] ? clear_extent_bit+0x3d0/0x3d0 [btrfs]
[15121.143445]  [<ffffffff8101dbb9>] ? sched_clock+0x9/0x10
[15121.144529]  [<ffffffff8108cb65>] ? sched_clock_local+0x25/0x90
[15121.145628]  [<ffffffff8105ce5e>] ? try_to_wake_up+0x1de/0x290
[15121.146711]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15121.147786]  [<ffffffff81415fd5>] schedule_timeout+0x305/0x390
[15121.148873]  [<ffffffff8104e053>] ? __wake_up+0x53/0x70
[15121.149957]  [<ffffffff81414b48>] wait_for_common+0xc8/0x160
[15121.151050]  [<ffffffff8105cf10>] ? try_to_wake_up+0x290/0x290
[15121.152166]  [<ffffffff81414bfd>] wait_for_completion+0x1d/0x20
[15121.153277]  [<ffffffffa05281db>] write_dev_flush+0x4b/0x140 [btrfs]
[15121.154391]  [<ffffffffa052a1a6>] write_all_supers+0x6f6/0x800 [btrfs]
[15121.155514]  [<ffffffffa052a2c3>] write_ctree_super+0x13/0x20 [btrfs]
[15121.156627]  [<ffffffffa052f62d>] btrfs_commit_transaction+0x63d/0x880 [btrfs]
[15121.157736]  [<ffffffff81086850>] ? abort_exclusive_wait+0xb0/0xb0
[15121.158849]  [<ffffffffa052fcc4>] ? start_transaction+0x94/0x2b0 [btrfs]
[15121.159937]  [<ffffffffa0527e6d>] transaction_kthread+0x26d/0x290 [btrfs]
[15121.161030]  [<ffffffffa0527c00>] ? btrfs_congested_fn+0xd0/0xd0 [btrfs]
[15121.162138]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15121.163231]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15121.164323]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15121.165417]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15121.166491] INFO: task kworker/3:0:3566 blocked for more than 120 seconds.
[15121.167565] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15121.168673] kworker/3:0     D ffff88020fcdb505     0  3566      2 0x00000000
[15121.169744]  ffff88006f937ba0 0000000000000046 ffff88020fcd3400 ffff88006f937cf0
[15121.170795]  ffff8801f94f1c80 ffff88006f937fd8 ffff88006f937fd8 ffff88006f937fd8
[15121.171849]  ffff88020107aac0 ffff8801f94f1c80 0000000000000000 ffff880207804500
[15121.172881] Call Trace:
[15121.173900]  [<ffffffffa042ab0c>] ? xfs_getsb+0x3c/0x70 [xfs]
[15121.174921]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15121.175957]  [<ffffffff81415fd5>] schedule_timeout+0x305/0x390
[15121.176977]  [<ffffffffa042ab0c>] ? xfs_getsb+0x3c/0x70 [xfs]
[15121.177982]  [<ffffffff814175b4>] __down+0x6d/0x9a
[15121.178999]  [<ffffffff8108be31>] down+0x41/0x50
[15121.180002]  [<ffffffffa03d71e4>] xfs_buf_lock+0x44/0x180 [xfs]
[15121.181015]  [<ffffffffa042ab0c>] xfs_getsb+0x3c/0x70 [xfs]
[15121.182043]  [<ffffffffa0437b9c>] xfs_trans_getsb+0x4c/0x1a0 [xfs]
[15121.183062]  [<ffffffffa042a7de>] xfs_mod_sb+0x4e/0xd0 [xfs]
[15121.184078]  [<ffffffffa03e8c70>] ? xfs_sync_inode_attr+0xf0/0xf0 [xfs]
[15121.185099]  [<ffffffffa03de164>] xfs_fs_log_dummy+0x54/0x90 [xfs]
[15121.186137]  [<ffffffff8122d680>] ? cfq_init_queue+0x4c0/0x4c0
[15121.187160]  [<ffffffffa03e8cf4>] xfs_sync_worker+0x84/0x90 [xfs]
[15121.188179]  [<ffffffff81080546>] process_one_work+0x116/0x4d0
[15121.189211]  [<ffffffff81080ede>] worker_thread+0x15e/0x350
[15121.190226]  [<ffffffff81080d80>] ? manage_workers.isra.29+0x230/0x230
[15121.191246]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15121.192270]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15121.193279]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15121.194287]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15121.195298] INFO: task rsync:3619 blocked for more than 120 seconds.
[15121.196312] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15121.197340] rsync           D 00000001004314eb     0  3619   2375 0x00000000
[15121.198375]  ffff8800bbde35e8 0000000000000086 ffff880000000000 ffffffff8104e053
[15121.199436]  ffff8801f94f5580 ffff8800bbde3fd8 ffff8800bbde3fd8 ffff8800bbde3fd8
[15121.200484]  ffff880202cb4e60 ffff8801f94f5580 ffff8800bbde3538 ffffffffa01ef1be
[15121.201533] Call Trace:
[15121.202576]  [<ffffffff8104e053>] ? __wake_up+0x53/0x70
[15121.203606]  [<ffffffffa01ef1be>] ? loop_make_request+0xde/0x110 [loop]
[15121.204639]  [<ffffffff8121af47>] ? generic_make_request+0xc7/0x100
[15121.205670]  [<ffffffff8121b007>] ? submit_bio+0x87/0x110
[15121.206679]  [<ffffffff8101d639>] ? read_tsc+0x9/0x20
[15121.207685]  [<ffffffff81103140>] ? __lock_page+0x70/0x70
[15121.208693]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15121.209681]  [<ffffffff8141596f>] io_schedule+0x8f/0xd0
[15121.210664]  [<ffffffff8110314e>] sleep_on_page+0xe/0x20
[15121.211648]  [<ffffffff8141611f>] __wait_on_bit+0x5f/0x90
[15121.212649]  [<ffffffff81103338>] wait_on_page_bit+0x78/0x80
[15121.213635]  [<ffffffff81086890>] ? autoremove_wake_function+0x40/0x40
[15121.214633]  [<ffffffffa054fdd6>] read_extent_buffer_pages+0x476/0x510 [btrfs]
[15121.215650]  [<ffffffffa0526f90>] ? verify_parent_transid+0x160/0x160 [btrfs]
[15121.216660]  [<ffffffffa052815a>] btree_read_extent_buffer_pages.isra.100+0x8a/0xc0 [btrfs]
[15121.217683]  [<ffffffffa05298e1>] read_tree_block+0x41/0x60 [btrfs]
[15121.218718]  [<ffffffffa0510ca3>] read_block_for_search.isra.33+0xf3/0x3d0 [btrfs]
[15121.219747]  [<ffffffffa0512fe0>] btrfs_search_slot+0x390/0x8a0 [btrfs]
[15121.220777]  [<ffffffffa0524858>] btrfs_lookup_file_extent+0x38/0x40 [btrfs]
[15121.221810]  [<ffffffffa05338fb>] btrfs_get_extent+0x17b/0x970 [btrfs]
[15121.222864]  [<ffffffffa054bb68>] ? lock_extent_bits+0x88/0xb0 [btrfs]
[15121.223895]  [<ffffffffa0548f84>] ? btrfs_lookup_ordered_extent+0x64/0xd0 [btrfs]
[15121.224937]  [<ffffffffa054d726>] __extent_read_full_page+0x2b6/0x710 [btrfs]
[15121.225985]  [<ffffffff8115c0fa>] ? __mem_cgroup_commit_charge_lrucare+0x8a/0x1b0
[15121.227024]  [<ffffffffa0533780>] ? uncompress_inline.isra.47+0x1d0/0x1d0 [btrfs]
[15121.228062]  [<ffffffffa054e9d0>] extent_readpages+0xc0/0x100 [btrfs]
[15121.229116]  [<ffffffffa0533780>] ? uncompress_inline.isra.47+0x1d0/0x1d0 [btrfs]
[15121.230174]  [<ffffffffa05327ef>] btrfs_readpages+0x1f/0x30 [btrfs]
[15121.231230]  [<ffffffff8110ef22>] __do_page_cache_readahead+0x1d2/0x280
[15121.232287]  [<ffffffff8110f331>] ra_submit+0x21/0x30
[15121.233313]  [<ffffffff8110f455>] ondemand_readahead+0x115/0x260
[15121.234329]  [<ffffffff8110f681>] page_cache_sync_readahead+0x31/0x50
[15121.235348]  [<ffffffff81104fd8>] generic_file_aio_read+0x428/0x780
[15121.236368]  [<ffffffff81164412>] do_sync_read+0xd2/0x110
[15121.237385]  [<ffffffff811f26d4>] ? security_file_permission+0x94/0xb0
[15121.238401]  [<ffffffff811648b1>] ? rw_verify_area+0x61/0xf0
[15121.239419]  [<ffffffff81164d8c>] vfs_read+0xac/0x180
[15121.240423]  [<ffffffff81164eaa>] sys_read+0x4a/0x90
[15121.241414]  [<ffffffff814190c2>] system_call_fastpath+0x16/0x1b
[15241.241839] INFO: task loop0:1345 blocked for more than 120 seconds.
[15241.242869] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15241.243891] loop0           D 0000000100431764     0  1345      2 0x00000000
[15241.244921]  ffff8801f93f9b30 0000000000000046 0000000000000000 0000000000000000
[15241.245976]  ffff880201a49c80 ffff8801f93f9fd8 ffff8801f93f9fd8 ffff8801f93f9fd8
[15241.247025]  ffff880202cb4e60 ffff880201a49c80 0000000000000002 ffff8801f93f9b78
[15241.248071] Call Trace:
[15241.249128]  [<ffffffff81102e35>] ? find_get_pages_tag+0x125/0x150
[15241.250182]  [<ffffffff8110f6c5>] ? pagevec_lookup_tag+0x25/0x40
[15241.251233]  [<ffffffff8101d639>] ? read_tsc+0x9/0x20
[15241.252290]  [<ffffffff81103140>] ? __lock_page+0x70/0x70
[15241.253334]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15241.254374]  [<ffffffff8141596f>] io_schedule+0x8f/0xd0
[15241.255422]  [<ffffffff8110314e>] sleep_on_page+0xe/0x20
[15241.256455]  [<ffffffff8141611f>] __wait_on_bit+0x5f/0x90
[15241.257486]  [<ffffffff81103338>] wait_on_page_bit+0x78/0x80
[15241.258531]  [<ffffffff81086890>] ? autoremove_wake_function+0x40/0x40
[15241.259568]  [<ffffffff811034ac>] filemap_fdatawait_range+0x10c/0x1a0
[15241.260598]  [<ffffffff811044e8>] filemap_write_and_wait_range+0x68/0x80
[15241.261625]  [<ffffffffa03db244>] xfs_file_fsync+0x54/0x340 [xfs]
[15241.262652]  [<ffffffff81192b2b>] vfs_fsync+0x2b/0x40
[15241.263653]  [<ffffffffa01eecf2>] do_bio_filebacked+0x1b2/0x320 [loop]
[15241.264664]  [<ffffffffa0552901>] ? btrfs_end_bio+0x81/0xe0 [btrfs]
[15241.265687]  [<ffffffffa05280cc>] ? end_workqueue_bio+0x9c/0xa0 [btrfs]
[15241.266686]  [<ffffffffa01eef1b>] loop_thread+0xbb/0x260 [loop]
[15241.267682]  [<ffffffff81086850>] ? abort_exclusive_wait+0xb0/0xb0
[15241.268691]  [<ffffffffa01eee60>] ? do_bio_filebacked+0x320/0x320 [loop]
[15241.269688]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15241.270683]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15241.271684]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15241.272703]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15241.273709] INFO: task btrfs-transacti:1386 blocked for more than 120 seconds.
[15241.274731] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15241.275781] btrfs-transacti D 000000010043147a     0  1386      2 0x00000000
[15241.276828]  ffff8801dbf47bc0 0000000000000046 ffffffffa054ae80 ffff880200978300
[15241.277883]  ffff8801f94f4e60 ffff8801dbf47fd8 ffff8801dbf47fd8 ffff8801dbf47fd8
[15241.278957]  ffff880202cb4e60 ffff8801f94f4e60 ffff8801dbf47af0 ffffffff8101dbb9
[15241.280014] Call Trace:
[15241.281059]  [<ffffffffa054ae80>] ? clear_extent_bit+0x3d0/0x3d0 [btrfs]
[15241.282123]  [<ffffffff8101dbb9>] ? sched_clock+0x9/0x10
[15241.283169]  [<ffffffff8108cb65>] ? sched_clock_local+0x25/0x90
[15241.284209]  [<ffffffff8105ce5e>] ? try_to_wake_up+0x1de/0x290
[15241.285256]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15241.286284]  [<ffffffff81415fd5>] schedule_timeout+0x305/0x390
[15241.287313]  [<ffffffff8104e053>] ? __wake_up+0x53/0x70
[15241.288337]  [<ffffffff81414b48>] wait_for_common+0xc8/0x160
[15241.289373]  [<ffffffff8105cf10>] ? try_to_wake_up+0x290/0x290
[15241.290388]  [<ffffffff81414bfd>] wait_for_completion+0x1d/0x20
[15241.291399]  [<ffffffffa05281db>] write_dev_flush+0x4b/0x140 [btrfs]
[15241.292420]  [<ffffffffa052a1a6>] write_all_supers+0x6f6/0x800 [btrfs]
[15241.293424]  [<ffffffffa052a2c3>] write_ctree_super+0x13/0x20 [btrfs]
[15241.294421]  [<ffffffffa052f62d>] btrfs_commit_transaction+0x63d/0x880 [btrfs]
[15241.295424]  [<ffffffff81086850>] ? abort_exclusive_wait+0xb0/0xb0
[15241.296425]  [<ffffffffa052fcc4>] ? start_transaction+0x94/0x2b0 [btrfs]
[15241.297426]  [<ffffffffa0527e6d>] transaction_kthread+0x26d/0x290 [btrfs]
[15241.298429]  [<ffffffffa0527c00>] ? btrfs_congested_fn+0xd0/0xd0 [btrfs]
[15241.299443]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15241.300437]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15241.301435]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15241.302444]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15241.303438] INFO: task kworker/3:0:3566 blocked for more than 120 seconds.
[15241.304445] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15241.305482] kworker/3:0     D ffff88020fcdb505     0  3566      2 0x00000000
[15241.306521]  ffff88006f937ba0 0000000000000046 ffff88020fcd3400 ffff88006f937cf0
[15241.307567]  ffff8801f94f1c80 ffff88006f937fd8 ffff88006f937fd8 ffff88006f937fd8
[15241.308612]  ffff88020107aac0 ffff8801f94f1c80 0000000000000000 ffff880207804500
[15241.309640] Call Trace:
[15241.310658]  [<ffffffffa042ab0c>] ? xfs_getsb+0x3c/0x70 [xfs]
[15241.311677]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15241.312708]  [<ffffffff81415fd5>] schedule_timeout+0x305/0x390
[15241.313722]  [<ffffffffa042ab0c>] ? xfs_getsb+0x3c/0x70 [xfs]
[15241.314720]  [<ffffffff814175b4>] __down+0x6d/0x9a
[15241.315731]  [<ffffffff8108be31>] down+0x41/0x50
[15241.316732]  [<ffffffffa03d71e4>] xfs_buf_lock+0x44/0x180 [xfs]
[15241.317740]  [<ffffffffa042ab0c>] xfs_getsb+0x3c/0x70 [xfs]
[15241.318757]  [<ffffffffa0437b9c>] xfs_trans_getsb+0x4c/0x1a0 [xfs]
[15241.319772]  [<ffffffffa042a7de>] xfs_mod_sb+0x4e/0xd0 [xfs]
[15241.320784]  [<ffffffffa03e8c70>] ? xfs_sync_inode_attr+0xf0/0xf0 [xfs]
[15241.321801]  [<ffffffffa03de164>] xfs_fs_log_dummy+0x54/0x90 [xfs]
[15241.322828]  [<ffffffff8122d680>] ? cfq_init_queue+0x4c0/0x4c0
[15241.323841]  [<ffffffffa03e8cf4>] xfs_sync_worker+0x84/0x90 [xfs]
[15241.324851]  [<ffffffff81080546>] process_one_work+0x116/0x4d0
[15241.325873]  [<ffffffff81080ede>] worker_thread+0x15e/0x350
[15241.326877]  [<ffffffff81080d80>] ? manage_workers.isra.29+0x230/0x230
[15241.327885]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15241.328902]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15241.329909]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15241.330915]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15241.331924] INFO: task rsync:3619 blocked for more than 120 seconds.
[15241.332933] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15241.333955] rsync           D 00000001004314eb     0  3619   2375 0x00000000
[15241.334985]  ffff8800bbde35e8 0000000000000086 ffff880000000000 ffffffff8104e053
[15241.336040]  ffff8801f94f5580 ffff8800bbde3fd8 ffff8800bbde3fd8 ffff8800bbde3fd8
[15241.337085]  ffff880202cb4e60 ffff8801f94f5580 ffff8800bbde3538 ffffffffa01ef1be
[15241.338127] Call Trace:
[15241.339162]  [<ffffffff8104e053>] ? __wake_up+0x53/0x70
[15241.340186]  [<ffffffffa01ef1be>] ? loop_make_request+0xde/0x110 [loop]
[15241.341205]  [<ffffffff8121af47>] ? generic_make_request+0xc7/0x100
[15241.342232]  [<ffffffff8121b007>] ? submit_bio+0x87/0x110
[15241.343242]  [<ffffffff8101d639>] ? read_tsc+0x9/0x20
[15241.344247]  [<ffffffff81103140>] ? __lock_page+0x70/0x70
[15241.345251]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15241.346233]  [<ffffffff8141596f>] io_schedule+0x8f/0xd0
[15241.347213]  [<ffffffff8110314e>] sleep_on_page+0xe/0x20
[15241.348194]  [<ffffffff8141611f>] __wait_on_bit+0x5f/0x90
[15241.349189]  [<ffffffff81103338>] wait_on_page_bit+0x78/0x80
[15241.350168]  [<ffffffff81086890>] ? autoremove_wake_function+0x40/0x40
[15241.351158]  [<ffffffffa054fdd6>] read_extent_buffer_pages+0x476/0x510 [btrfs]
[15241.352169]  [<ffffffffa0526f90>] ? verify_parent_transid+0x160/0x160 [btrfs]
[15241.353172]  [<ffffffffa052815a>] btree_read_extent_buffer_pages.isra.100+0x8a/0xc0 [btrfs]
[15241.354186]  [<ffffffffa05298e1>] read_tree_block+0x41/0x60 [btrfs]
[15241.355213]  [<ffffffffa0510ca3>] read_block_for_search.isra.33+0xf3/0x3d0 [btrfs]
[15241.356237]  [<ffffffffa0512fe0>] btrfs_search_slot+0x390/0x8a0 [btrfs]
[15241.357264]  [<ffffffffa0524858>] btrfs_lookup_file_extent+0x38/0x40 [btrfs]
[15241.358298]  [<ffffffffa05338fb>] btrfs_get_extent+0x17b/0x970 [btrfs]
[15241.359342]  [<ffffffffa054bb68>] ? lock_extent_bits+0x88/0xb0 [btrfs]
[15241.360367]  [<ffffffffa0548f84>] ? btrfs_lookup_ordered_extent+0x64/0xd0 [btrfs]
[15241.361397]  [<ffffffffa054d726>] __extent_read_full_page+0x2b6/0x710 [btrfs]
[15241.362439]  [<ffffffff8115c0fa>] ? __mem_cgroup_commit_charge_lrucare+0x8a/0x1b0
[15241.363479]  [<ffffffffa0533780>] ? uncompress_inline.isra.47+0x1d0/0x1d0 [btrfs]
[15241.364519]  [<ffffffffa054e9d0>] extent_readpages+0xc0/0x100 [btrfs]
[15241.365573]  [<ffffffffa0533780>] ? uncompress_inline.isra.47+0x1d0/0x1d0 [btrfs]
[15241.366619]  [<ffffffffa05327ef>] btrfs_readpages+0x1f/0x30 [btrfs]
[15241.367660]  [<ffffffff8110ef22>] __do_page_cache_readahead+0x1d2/0x280
[15241.368712]  [<ffffffff8110f331>] ra_submit+0x21/0x30
[15241.369733]  [<ffffffff8110f455>] ondemand_readahead+0x115/0x260
[15241.370747]  [<ffffffff8110f681>] page_cache_sync_readahead+0x31/0x50
[15241.371754]  [<ffffffff81104fd8>] generic_file_aio_read+0x428/0x780
[15241.372781]  [<ffffffff81164412>] do_sync_read+0xd2/0x110
[15241.373787]  [<ffffffff811f26d4>] ? security_file_permission+0x94/0xb0
[15241.374788]  [<ffffffff811648b1>] ? rw_verify_area+0x61/0xf0
[15241.375796]  [<ffffffff81164d8c>] vfs_read+0xac/0x180
[15241.376788]  [<ffffffff81164eaa>] sys_read+0x4a/0x90
[15241.377776]  [<ffffffff814190c2>] system_call_fastpath+0x16/0x1b
[15361.378494] INFO: task khugepaged:61 blocked for more than 120 seconds.
[15361.379515] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15361.380537] khugepaged      D 0000000100440921     0    61      2 0x00000000
[15361.381570]  ffff880201849700 0000000000000046 0000000000000000 0000000000000000
[15361.382630]  ffff880201f8eae0 ffff880201849fd8 ffff880201849fd8 ffff880201849fd8
[15361.383680]  ffffffff8180d020 ffff880201f8eae0 ffff8801543d8620 ffff8801543d8620
[15361.384729] Call Trace:
[15361.385782]  [<ffffffff8101d639>] ? read_tsc+0x9/0x20
[15361.386828]  [<ffffffff81103140>] ? __lock_page+0x70/0x70
[15361.387871]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15361.388917]  [<ffffffff8141596f>] io_schedule+0x8f/0xd0
[15361.389952]  [<ffffffff8110314e>] sleep_on_page+0xe/0x20
[15361.390983]  [<ffffffff8141611f>] __wait_on_bit+0x5f/0x90
[15361.392022]  [<ffffffff81103338>] wait_on_page_bit+0x78/0x80
[15361.393052]  [<ffffffff81086890>] ? autoremove_wake_function+0x40/0x40
[15361.394087]  [<ffffffff81116875>] shrink_page_list+0x455/0x980
[15361.395119]  [<ffffffff811143c2>] ? update_isolated_counts+0x162/0x190
[15361.396171]  [<ffffffff811173c5>] shrink_inactive_list+0x345/0x4e0
[15361.397202]  [<ffffffff81117d3c>] shrink_zone+0x47c/0x5c0
[15361.398216]  [<ffffffff8109024d>] ? ktime_get_ts+0xad/0xe0
[15361.399231]  [<ffffffff811181be>] do_try_to_free_pages+0xce/0x490
[15361.400230]  [<ffffffff811188cb>] try_to_free_pages+0xab/0x1d0
[15361.401224]  [<ffffffff8110ba8c>] __alloc_pages_nodemask+0x52c/0x850
[15361.402231]  [<ffffffff81415e43>] ? schedule_timeout+0x173/0x390
[15361.403219]  [<ffffffff81086947>] ? finish_wait+0x67/0x80
[15361.404203]  [<ffffffff81145bea>] alloc_pages_vma+0x9a/0x180
[15361.405196]  [<ffffffff811552d6>] khugepaged+0x7c6/0x13b0
[15361.406174]  [<ffffffff81086850>] ? abort_exclusive_wait+0xb0/0xb0
[15361.407154]  [<ffffffff81154b10>] ? khugepaged_defrag_store+0x70/0x70
[15361.408138]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15361.409136]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15361.410125]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15361.411118]  [<ffffffff8141b230>] ? gs_change+0x13/0x13
[15361.412127] INFO: task loop0:1345 blocked for more than 120 seconds.
[15361.413132] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[15361.414153] loop0           D 0000000100431764     0  1345      2 0x00000000
[15361.415191]  ffff8801f93f9b30 0000000000000046 0000000000000000 0000000000000000
[15361.416226]  ffff880201a49c80 ffff8801f93f9fd8 ffff8801f93f9fd8 ffff8801f93f9fd8
[15361.417261]  ffff880202cb4e60 ffff880201a49c80 0000000000000002 ffff8801f93f9b78
[15361.418287] Call Trace:
[15361.419306]  [<ffffffff81102e35>] ? find_get_pages_tag+0x125/0x150
[15361.420331]  [<ffffffff8110f6c5>] ? pagevec_lookup_tag+0x25/0x40
[15361.421346]  [<ffffffff8101d639>] ? read_tsc+0x9/0x20
[15361.422369]  [<ffffffff81103140>] ? __lock_page+0x70/0x70
[15361.423377]  [<ffffffff814158bf>] schedule+0x3f/0x60
[15361.424382]  [<ffffffff8141596f>] io_schedule+0x8f/0xd0
[15361.425388]  [<ffffffff8110314e>] sleep_on_page+0xe/0x20
[15361.426380]  [<ffffffff8141611f>] __wait_on_bit+0x5f/0x90
[15361.427363]  [<ffffffff81103338>] wait_on_page_bit+0x78/0x80
[15361.428341]  [<ffffffff81086890>] ? autoremove_wake_function+0x40/0x40
[15361.429331]  [<ffffffff811034ac>] filemap_fdatawait_range+0x10c/0x1a0
[15361.430305]  [<ffffffff811044e8>] filemap_write_and_wait_range+0x68/0x80
[15361.431287]  [<ffffffffa03db244>] xfs_file_fsync+0x54/0x340 [xfs]
[15361.432265]  [<ffffffff81192b2b>] vfs_fsync+0x2b/0x40
[15361.433229]  [<ffffffffa01eecf2>] do_bio_filebacked+0x1b2/0x320 [loop]
[15361.434209]  [<ffffffffa0552901>] ? btrfs_end_bio+0x81/0xe0 [btrfs]
[15361.435193]  [<ffffffffa05280cc>] ? end_workqueue_bio+0x9c/0xa0 [btrfs]
[15361.436166]  [<ffffffffa01eef1b>] loop_thread+0xbb/0x260 [loop]
[15361.437138]  [<ffffffff81086850>] ? abort_exclusive_wait+0xb0/0xb0
[15361.438111]  [<ffffffffa01eee60>] ? do_bio_filebacked+0x320/0x320 [loop]
[15361.439102]  [<ffffffff81085f0c>] kthread+0x8c/0xa0
[15361.440077]  [<ffffffff8141b234>] kernel_thread_helper+0x4/0x10
[15361.441062]  [<ffffffff81085e80>] ? kthread_worker_fn+0x190/0x190
[15361.442061]  [<ffffffff8141b230>] ? gs_change+0x13/0x13