[43142.047947] INFO: task btrfs-cleaner:238 blocked for more than 120 seconds.
[43142.047962]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43142.047963] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43142.047965] btrfs-cleaner   D ffff945e6e52bd00     0   238      2 0x00000000
[43142.047989]  ffff945e6e52bd00 00ff945e6e52bcd8 ffffffffad80d540 ffff945e6fc70000
[43142.047991]  0000000000000046 ffff945e6e52c000 ffff945e6ff7b9f0 ffff945e6ff7b800
[43142.047993]  ffff945e6ff7b9f0 0000000000000001 ffff945e6e52bd18 ffffffffad295845
[43142.047995] Call Trace:
[43142.048026]  [<ffffffffad295845>] schedule+0x35/0x80
[43142.048157]  [<ffffffffc0431b63>] wait_current_trans.isra.21+0xd3/0x120 [btrfs]
[43142.048174]  [<ffffffffacac7150>] ? wake_atomic_t_function+0x60/0x60
[43142.048187]  [<ffffffffc0434311>] start_transaction+0x2c1/0x4a0 [btrfs]
[43142.048200]  [<ffffffffc0434508>] btrfs_start_transaction+0x18/0x20 [btrfs]
[43142.048211]  [<ffffffffc041ad4f>] btrfs_drop_snapshot+0x7f/0x850 [btrfs]
[43142.048213]  [<ffffffffad2953a8>] ? __schedule+0x308/0x770
[43142.048226]  [<ffffffffc0433534>] btrfs_clean_one_deleted_snapshot+0xb4/0x100 [btrfs]
[43142.048240]  [<ffffffffc0429fbd>] cleaner_kthread+0x15d/0x1c0 [btrfs]
[43142.048259]  [<ffffffffc0429e60>] ? btrfs_destroy_pinned_extent+0x130/0x130 [btrfs]
[43142.048262]  [<ffffffffacaa3e58>] kthread+0xd8/0xf0
[43142.048268]  [<ffffffffad29a25f>] ret_from_fork+0x1f/0x40
[43142.048270]  [<ffffffffacaa3d80>] ? kthread_create_on_node+0x1e0/0x1e0
[43142.048295] INFO: task smbd:9182 blocked for more than 120 seconds.
[43142.048297]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43142.048298] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43142.048299] smbd            D ffff945e06f4fd18     0  9182   1302 0x00000000
[43142.048301]  ffff945e06f4fd18 00ff945e77494000 ffff945deac0a700 ffff945e72400d00
[43142.048303]  ffff945e6e534f88 ffff945e06f50000 ffff945e777bb1f0 ffff945e777bb000
[43142.048305]  ffff945e777bb1f0 0000000000000001 ffff945e06f4fd30 ffffffffad295845
[43142.048307] Call Trace:
[43142.048308]  [<ffffffffad295845>] schedule+0x35/0x80
[43142.048322]  [<ffffffffc0431b63>] wait_current_trans.isra.21+0xd3/0x120 [btrfs]
[43142.048323]  [<ffffffffacac7150>] ? wake_atomic_t_function+0x60/0x60
[43142.048336]  [<ffffffffc0434311>] start_transaction+0x2c1/0x4a0 [btrfs]
[43142.048349]  [<ffffffffc0434508>] btrfs_start_transaction+0x18/0x20 [btrfs]
[43142.048362]  [<ffffffffc04406b7>] btrfs_setattr+0x1e7/0x360 [btrfs]
[43142.048371]  [<ffffffffacc5204c>] notify_change+0x30c/0x480
[43142.048377]  [<ffffffffacc2f433>] do_truncate+0x73/0xc0
[43142.048379]  [<ffffffffacc302b9>] do_sys_ftruncate.constprop.13+0x119/0x180
[43142.048380]  [<ffffffffacc304be>] SyS_ftruncate+0xe/0x10
[43142.048382]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43142.048386] INFO: task smbd:9795 blocked for more than 120 seconds.
[43142.048388]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43142.048389] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43142.048390] smbd            D ffff945d630dbc78     0  9795   1302 0x00000000
[43142.048392]  ffff945d630dbc78 00ff945e77494000 ffff945e6fc76800 ffff945deac0a700
[43142.048394]  ffff945e6e5ae2c8 ffff945d630dc000 ffff945e705549f0 ffff945e70554800
[43142.048396]  ffff945e705549f0 0000000000000001 ffff945d630dbc90 ffffffffad295845
[43142.048398] Call Trace:
[43142.048399]  [<ffffffffad295845>] schedule+0x35/0x80
[43142.048412]  [<ffffffffc0431b63>] wait_current_trans.isra.21+0xd3/0x120 [btrfs]
[43142.048413]  [<ffffffffacac7150>] ? wake_atomic_t_function+0x60/0x60
[43142.048426]  [<ffffffffc0434311>] start_transaction+0x2c1/0x4a0 [btrfs]
[43142.048439]  [<ffffffffc0434508>] btrfs_start_transaction+0x18/0x20 [btrfs]
[43142.048455]  [<ffffffffc04445ed>] btrfs_mknod+0x4d/0x200 [btrfs]
[43142.048459]  [<ffffffffacc4002b>] vfs_mknod+0x14b/0x1e0
[43142.048465]  [<ffffffffad228a7a>] unix_bind+0x31a/0x3a0
[43142.048479]  [<ffffffffad15fe42>] SYSC_bind+0xd2/0x110
[43142.048481]  [<ffffffffacc46c96>] ? SyS_fcntl+0x3e6/0x4e0
[43142.048489]  [<ffffffffad160ace>] SyS_bind+0xe/0x10
[43142.048491]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43142.048493] INFO: task smbd:9796 blocked for more than 120 seconds.
[43142.048508]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43142.048510] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43142.048511] smbd            D ffff945d6275fd88     0  9796   1302 0x00000000
[43142.048513]  ffff945d6275fd88 0000000000000000 ffff945e78230d00 ffff945deac0c100
[43142.048515]  ffff945d6275fd80 ffff945d62760000 ffff945e6e2939d8 ffff945e6e2939f0
[43142.048517]  ffff945e6e2939e0 ffff945e6e2939d8 ffff945d6275fda0 ffffffffad295845
[43142.048519] Call Trace:
[43142.048521]  [<ffffffffad295845>] schedule+0x35/0x80
[43142.048522]  [<ffffffffad2986ee>] rwsem_down_write_failed+0x20e/0x3c0
[43142.048529]  [<fffffffface3eb57>] call_rwsem_down_write_failed+0x17/0x30
[43142.048531]  [<ffffffffad297d2d>] down_write+0x2d/0x40
[43142.048532]  [<ffffffffacc4413a>] do_unlinkat+0x1aa/0x310
[43142.048533]  [<ffffffffacc358b1>] ? __sb_end_write+0x21/0x30
[43142.048534]  [<ffffffffacc44e16>] SyS_unlink+0x16/0x20
[43142.048536]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43262.872945] INFO: task btrfs-cleaner:238 blocked for more than 120 seconds.
[43262.872951]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43262.872953] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43262.872954] btrfs-cleaner   D ffff945e6e52bd00     0   238      2 0x00000000
[43262.872961]  ffff945e6e52bd00 00ff945e6e52bcd8 ffffffffad80d540 ffff945e6fc70000
[43262.872964]  0000000000000046 ffff945e6e52c000 ffff945e6ff7b9f0 ffff945e6ff7b800
[43262.872966]  ffff945e6ff7b9f0 0000000000000001 ffff945e6e52bd18 ffffffffad295845
[43262.872968] Call Trace:
[43262.872977]  [<ffffffffad295845>] schedule+0x35/0x80
[43262.873018]  [<ffffffffc0431b63>] wait_current_trans.isra.21+0xd3/0x120 [btrfs]
[43262.873022]  [<ffffffffacac7150>] ? wake_atomic_t_function+0x60/0x60
[43262.873035]  [<ffffffffc0434311>] start_transaction+0x2c1/0x4a0 [btrfs]
[43262.873048]  [<ffffffffc0434508>] btrfs_start_transaction+0x18/0x20 [btrfs]
[43262.873059]  [<ffffffffc041ad4f>] btrfs_drop_snapshot+0x7f/0x850 [btrfs]
[43262.873060]  [<ffffffffad2953a8>] ? __schedule+0x308/0x770
[43262.873073]  [<ffffffffc0433534>] btrfs_clean_one_deleted_snapshot+0xb4/0x100 [btrfs]
[43262.873085]  [<ffffffffc0429fbd>] cleaner_kthread+0x15d/0x1c0 [btrfs]
[43262.873097]  [<ffffffffc0429e60>] ? btrfs_destroy_pinned_extent+0x130/0x130 [btrfs]
[43262.873100]  [<ffffffffacaa3e58>] kthread+0xd8/0xf0
[43262.873102]  [<ffffffffad29a25f>] ret_from_fork+0x1f/0x40
[43262.873103]  [<ffffffffacaa3d80>] ? kthread_create_on_node+0x1e0/0x1e0
[43262.873115] INFO: task nmbd:1181 blocked for more than 120 seconds.
[43262.873116]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43262.873117] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43262.873118] nmbd            D ffff945e763efbc8     0  1181      1 0x00000000
[43262.873121]  ffff945e763efbc8 0000000000170fff ffff945e78230d00 ffff945e705a8000
[43262.873123]  ffff945e763efc58 ffff945e763f0000 ffff945dec94a69c ffff945dec94a680
[43262.873125]  ffff945e07a4ef60 0000000000170000 ffff945e763efbe0 ffffffffad295845
[43262.873126] Call Trace:
[43262.873128]  [<ffffffffad295845>] schedule+0x35/0x80
[43262.873142]  [<ffffffffc0454dd0>] lock_extent_bits+0x190/0x1e0 [btrfs]
[43262.873144]  [<ffffffffacac7150>] ? wake_atomic_t_function+0x60/0x60
[43262.873157]  [<ffffffffc044793b>] lock_and_cleanup_extent_if_need+0xfb/0x280 [btrfs]
[43262.873171]  [<ffffffffc0448d02>] __btrfs_buffered_write+0x1d2/0x710 [btrfs]
[43262.873173]  [<ffffffffacc433c4>] ? putname+0x54/0x60
[43262.873187]  [<ffffffffc044c890>] btrfs_file_write_iter+0x170/0x4d0 [btrfs]
[43262.873190]  [<ffffffffacc32655>] new_sync_write+0xd5/0x130
[43262.873191]  [<ffffffffacc326d6>] __vfs_write+0x26/0x40
[43262.873193]  [<ffffffffacc32e05>] vfs_write+0xb5/0x1a0
[43262.873194]  [<ffffffffacc34255>] SyS_write+0x55/0xc0
[43262.873196]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43262.873248] INFO: task lightdm-gtk-gre:1356 blocked for more than 120 seconds.
[43262.873250]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43262.873251] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43262.873252] lightdm-gtk-gre D ffff945e72957a88     0  1356   1350 0x00000000
[43262.873254]  ffff945e72957a88 00ff945e723a7600 ffff945e78230d00 ffff945e771c0000
[43262.873256]  ffff945e72957a78 ffff945e72958000 ffff945e7fd19200 7fffffffffffffff
[43262.873258]  ffffffffad296030 ffff945e72957be8 ffff945e72957aa0 ffffffffad295845
[43262.873260] Call Trace:
[43262.873262]  [<ffffffffad296030>] ? bit_wait+0x60/0x60
[43262.873263]  [<ffffffffad295845>] schedule+0x35/0x80
[43262.873264]  [<ffffffffad299098>] schedule_timeout+0x2c8/0x440
[43262.873266]  [<ffffffffacab7d13>] ? update_curr+0xf3/0x170
[43262.873267]  [<ffffffffacab6e35>] ? pick_next_entity+0x85/0x130
[43262.873280]  [<ffffffffaca63e6e>] ? kvm_clock_get_cycles+0x1e/0x20
[43262.873287]  [<ffffffffacafc651>] ? ktime_get+0x41/0xb0
[43262.873289]  [<ffffffffad296030>] ? bit_wait+0x60/0x60
[43262.873290]  [<ffffffffad295034>] io_schedule_timeout+0xa4/0x110
[43262.873291]  [<ffffffffad29604b>] bit_wait_io+0x1b/0x70
[43262.873292]  [<ffffffffad295de0>] __wait_on_bit_lock+0x50/0xa0
[43262.873295]  [<ffffffffacb9fa7b>] __lock_page+0xcb/0xf0
[43262.873296]  [<ffffffffacac7190>] ? autoremove_wake_function+0x40/0x40
[43262.873297]  [<ffffffffacba109f>] pagecache_get_page+0x19f/0x2a0
[43262.873311]  [<ffffffffc04483c6>] prepare_pages+0x96/0x240 [btrfs]
[43262.873325]  [<ffffffffc0448d29>] __btrfs_buffered_write+0x1f9/0x710 [btrfs]
[43262.873329]  [<ffffffffad15f69d>] ? sock_recvmsg+0x3d/0x50
[43262.873343]  [<ffffffffc044c890>] btrfs_file_write_iter+0x170/0x4d0 [btrfs]
[43262.873344]  [<ffffffffacc32655>] new_sync_write+0xd5/0x130
[43262.873346]  [<ffffffffacc326d6>] __vfs_write+0x26/0x40
[43262.873347]  [<ffffffffacc32e05>] vfs_write+0xb5/0x1a0
[43262.873348]  [<ffffffffacc34255>] SyS_write+0x55/0xc0
[43262.873350]  [<ffffffffacc47f23>] ? SyS_ioctl+0x63/0x90
[43262.873351]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43262.873356] INFO: task miniserv.pl:1401 blocked for more than 120 seconds.
[43262.873357]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43262.873358] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43262.873359] miniserv.pl     D ffff945e70eebc10     0  1401      1 0x00000000
[43262.873362]  ffff945e70eebc10 0000000000000001 ffff945e78230d00 ffff945e72406800
[43262.873364]  00000000024200ca ffff945e70eec000 ffff945e705549f0 ffff945e70554800
[43262.873366]  ffff945e705549f0 0000000000000001 ffff945e70eebc28 ffffffffad295845
[43262.873367] Call Trace:
[43262.873369]  [<ffffffffad295845>] schedule+0x35/0x80
[43262.873381]  [<ffffffffc0431b63>] wait_current_trans.isra.21+0xd3/0x120 [btrfs]
[43262.873383]  [<ffffffffacac7150>] ? wake_atomic_t_function+0x60/0x60
[43262.873396]  [<ffffffffc04342c2>] start_transaction+0x272/0x4a0 [btrfs]
[43262.873408]  [<ffffffffc0434547>] btrfs_join_transaction+0x17/0x20 [btrfs]
[43262.873422]  [<ffffffffc043aa0c>] btrfs_dirty_inode+0x3c/0xd0 [btrfs]
[43262.873435]  [<ffffffffc043ab1f>] btrfs_update_time+0x7f/0xc0 [btrfs]
[43262.873436]  [<ffffffffacc519e8>] touch_atime+0xa8/0xd0
[43262.873438]  [<ffffffffacba3219>] generic_file_read_iter+0x6d9/0x870
[43262.873441]  [<ffffffffacbdb1f6>] ? handle_mm_fault+0x8a6/0x13c0
[43262.873443]  [<ffffffffacc324f2>] new_sync_read+0xd2/0x120
[43262.873444]  [<ffffffffacc32566>] __vfs_read+0x26/0x40
[43262.873446]  [<ffffffffacc32cb6>] vfs_read+0x96/0x130
[43262.873447]  [<ffffffffacc34195>] SyS_read+0x55/0xc0
[43262.873452]  [<ffffffffaca6b6f7>] ? trace_do_page_fault+0x37/0xd0
[43262.873454]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43262.873456] INFO: task lpqd:1476 blocked for more than 120 seconds.
[43262.873457]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43262.873458] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43262.873459] lpqd            D ffff945e71067c98     0  1476   1302 0x00000000
[43262.873475]  ffff945e71067c98 00ffffffacc3e9d7 ffffffffad80d540 ffff945e709f4100
[43262.873477]  00000002fefefeff ffff945e71068000 ffff945dec94a8d8 ffff945dec94a8f0
[43262.873479]  ffff945dec94a8e0 ffff945dec94a8d8 ffff945e71067cb0 ffffffffad295845
[43262.873481] Call Trace:
[43262.873483]  [<ffffffffad295845>] schedule+0x35/0x80
[43262.873484]  [<ffffffffad2986ee>] rwsem_down_write_failed+0x20e/0x3c0
[43262.873487]  [<fffffffface3eb57>] call_rwsem_down_write_failed+0x17/0x30
[43262.873488]  [<ffffffffad297d2d>] down_write+0x2d/0x40
[43262.873502]  [<ffffffffc044c782>] btrfs_file_write_iter+0x62/0x4d0 [btrfs]
[43262.873504]  [<ffffffffacc3804e>] ? inode_get_bytes+0x1e/0x50
[43262.873505]  [<ffffffffacc32655>] new_sync_write+0xd5/0x130
[43262.873507]  [<ffffffffacc326d6>] __vfs_write+0x26/0x40
[43262.873508]  [<ffffffffacc32e05>] vfs_write+0xb5/0x1a0
[43262.873509]  [<ffffffffacc34255>] SyS_write+0x55/0xc0
[43262.873511]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8
[43262.873515] INFO: task smbd:2293 blocked for more than 120 seconds.
[43262.873516]       Not tainted 4.8.0-28-generic #30-Ubuntu
[43262.873517] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[43262.873518] smbd            D ffff945de78bfc98     0  2293   1302 0x00000000
[43262.873520]  ffff945de78bfc98 00ffffffacc3e9d7 ffff945e6fc76800 ffff945e72402700
[43262.873522]  00000002fefefeff ffff945de78c0000 ffff945dec94a8d8 ffff945dec94a8f0
[43262.873524]  ffff945dec94a8e0 ffff945dec94a8d8 ffff945de78bfcb0 ffffffffad295845
[43262.873526] Call Trace:
[43262.873527]  [<ffffffffad295845>] schedule+0x35/0x80
[43262.873528]  [<ffffffffad2986ee>] rwsem_down_write_failed+0x20e/0x3c0
[43262.873530]  [<fffffffface3eb57>] call_rwsem_down_write_failed+0x17/0x30
[43262.873531]  [<ffffffffad297d2d>] down_write+0x2d/0x40
[43262.873545]  [<ffffffffc044c782>] btrfs_file_write_iter+0x62/0x4d0 [btrfs]
[43262.873546]  [<ffffffffacc3804e>] ? inode_get_bytes+0x1e/0x50
[43262.873552]  [<ffffffffacc32655>] new_sync_write+0xd5/0x130
[43262.873553]  [<ffffffffacc326d6>] __vfs_write+0x26/0x40
[43262.873554]  [<ffffffffacc32e05>] vfs_write+0xb5/0x1a0
[43262.873556]  [<ffffffffacc34255>] SyS_write+0x55/0xc0
[43262.873557]  [<ffffffffad29a036>] entry_SYSCALL_64_fastpath+0x1e/0xa8