> This seems to be always cgroup_mutex mutex it blocks on. SysRq d (show
> all locks) should be able to show you who has the lock.
I could reproduce the lockup with cgroup stuff again, this time I with
information about locks.
[14406.842236] INFO: task kswork:69 blocked for more than 120 seconds.
[14406.842240] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14406.842241] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14406.842243] kswork D ffff8803fbf1c500 0 69 2 0x00000000
[14406.842247] ffff8804015e3c18 0000000000000092 00000000015e3c18
ffff8804015e3fd8
[14406.842248] ffff8804015e3fd8 ffff8804015e3fd8 ffff8804015e3fd8
ffff8804015e3ce0
[14406.842249] ffff880401928000 ffff8804015d8000 ffff8804015e3c38
ffff8804015d8000
[14406.842250] Call Trace:
[14406.842256] [<ffffffff81732694>] schedule+0x34/0xa0
[14406.842257] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14406.842258] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14406.842259] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14406.842260] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14406.842263] [<ffffffff810e3d4f>] ? css_release_work_fn+0x2f/0xd0
[14406.842265] [<ffffffff810e3d4f>] css_release_work_fn+0x2f/0xd0
[14406.842268] [<ffffffff81092a7a>] swork_kthread+0xfa/0x150
[14406.842269] [<ffffffff81092980>] ? swork_readable+0x40/0x40
[14406.842272] [<ffffffff81070036>] kthread+0xd6/0xf0
[14406.842273] [<ffffffff8107581f>] ? finish_task_switch+0x3f/0x140
[14406.842275] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14406.842276] [<ffffffff81736888>] ret_from_fork+0x58/0x90
[14406.842278] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14406.842279] 1 lock held by kswork/69:
[14406.842283] #0: (cgroup_mutex){......}, at: [<ffffffff810e3d4f>]
css_release_work_fn+0x2f/0xd0
[14406.842324] INFO: task kworker/3:0:10502 blocked for more than 120 seconds.
[14406.842326] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14406.842326] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14406.842327] kworker/3:0 D ffff8803a9426d40 0 10502 2 0x00000000
[14406.842331] Workqueue: cgroup_destroy css_killed_work_fn
[14406.842333] ffff8803a947fb98 0000000000000096 00000000a947fb98
ffff8803a947ffd8
[14406.842334] ffff8803a947ffd8 ffff8803a947ffd8 ffff8803a947ffd8
ffffffff81d25470
[14406.842334] ffff8803dace0000 ffff8800995f2290 ffff8803a947fbb8
ffff8800995f2290
[14406.842336] Call Trace:
[14406.842338] [<ffffffff81732694>] schedule+0x34/0xa0
[14406.842338] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14406.842339] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14406.842340] [<ffffffff8173443e>] ? rt_spin_lock_slowlock+0x5e/0x2c0
[14406.842341] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14406.842342] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14406.842343] [<ffffffff810e549f>] ? css_killed_work_fn+0x1f/0x170
[14406.842344] [<ffffffff810e549f>] css_killed_work_fn+0x1f/0x170
[14406.842346] [<ffffffff8106a92a>] process_one_work+0x1fa/0x5b0
[14406.842347] [<ffffffff8106a88d>] ? process_one_work+0x15d/0x5b0
[14406.842348] [<ffffffff8106ae4b>] worker_thread+0x16b/0x4c0
[14406.842349] [<ffffffff8106ace0>] ? process_one_work+0x5b0/0x5b0
[14406.842350] [<ffffffff81070036>] kthread+0xd6/0xf0
[14406.842351] [<ffffffff8107581f>] ? finish_task_switch+0x3f/0x140
[14406.842353] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14406.842354] [<ffffffff81736888>] ret_from_fork+0x58/0x90
[14406.842355] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14406.842356] 3 locks held by kworker/3:0/10502:
[14406.842361] #0: ("cgroup_destroy"){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[14406.842364] #1: ((&css->destroy_work)){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[14406.842367] #2: (cgroup_mutex){......}, at: [<ffffffff810e549f>]
css_killed_work_fn+0x1f/0x170
[14406.842375] INFO: task lxc-start:21854 blocked for more than 120 seconds.
[14406.842376] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14406.842377] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14406.842377] lxc-start D ffff8803a9422840 0 21854 21848 0x00000000
[14406.842380] ffff880401b33c48 0000000000000096 0000000001b33c48
ffff880401b33fd8
[14406.842380] ffff880401b33fd8 ffff880401b33fd8 ffff880401b33fd8
ffff880401b33d10
[14406.842381] ffff880401940000 ffff8803a7f38000 ffff880401b33c68
ffff8803a7f38000
[14406.842382] Call Trace:
[14406.842384] [<ffffffff81732694>] schedule+0x34/0xa0
[14406.842385] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14406.842386] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14406.842387] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14406.842387] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14406.842389] [<ffffffff810ea122>] ? proc_cgroup_show+0x52/0x200
[14406.842390] [<ffffffff810ea122>] proc_cgroup_show+0x52/0x200
[14406.842393] [<ffffffff81215b64>] proc_single_show+0x54/0xa0
[14406.842395] [<ffffffff811d082d>] seq_read+0xed/0x380
[14406.842397] [<ffffffff811aa32f>] vfs_read+0x9f/0x180
[14406.842398] [<ffffffff811aaea9>] SyS_read+0x49/0xb0
[14406.842399] [<ffffffff81736936>] system_call_fastpath+0x16/0x1b
[14406.842399] 2 locks held by lxc-start/21854:
[14406.842403] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[14406.842406] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[14406.842409] INFO: task lxc-ls:21856 blocked for more than 120 seconds.
[14406.842410] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14406.842411] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14406.842411] lxc-ls D ffff8803a9565640 0 21856 21855 0x00000000
[14406.842414] ffff8803b1103c48 0000000000000096 00000000b1103c48
ffff8803b1103fd8
[14406.842415] ffff8803b1103fd8 ffff8803b1103fd8 ffff8803b1103fd8
ffff8803b1103d10
[14406.842415] ffff880401942290 ffff8803ad9e4520 ffff8803b1103c68
ffff8803ad9e4520
[14406.842417] Call Trace:
[14406.842418] [<ffffffff81732694>] schedule+0x34/0xa0
[14406.842419] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14406.842420] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14406.842421] [<ffffffff810ea103>] ? proc_cgroup_show+0x33/0x200
[14406.842422] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14406.842423] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14406.842424] [<ffffffff810ea122>] ? proc_cgroup_show+0x52/0x200
[14406.842425] [<ffffffff810ea122>] proc_cgroup_show+0x52/0x200
[14406.842426] [<ffffffff81215b64>] proc_single_show+0x54/0xa0
[14406.842427] [<ffffffff811d082d>] seq_read+0xed/0x380
[14406.842428] [<ffffffff811aa32f>] vfs_read+0x9f/0x180
[14406.842429] [<ffffffff811aaea9>] SyS_read+0x49/0xb0
[14406.842430] [<ffffffff81736936>] system_call_fastpath+0x16/0x1b
[14406.842430] 2 locks held by lxc-ls/21856:
[14406.842435] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[14406.842437] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[14526.897563] INFO: task kswork:69 blocked for more than 120 seconds.
[14526.897570] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14526.897572] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14526.897575] kswork D ffff8803fbf1c500 0 69 2 0x00000000
[14526.897583] ffff8804015e3c18 0000000000000092 00000000015e3c18
ffff8804015e3fd8
[14526.897585] ffff8804015e3fd8 ffff8804015e3fd8 ffff8804015e3fd8
ffff8804015e3ce0
[14526.897586] ffff880401928000 ffff8804015d8000 ffff8804015e3c38
ffff8804015d8000
[14526.897590] Call Trace:
[14526.897611] [<ffffffff81732694>] schedule+0x34/0xa0
[14526.897613] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14526.897614] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14526.897616] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14526.897617] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14526.897621] [<ffffffff810e3d4f>] ? css_release_work_fn+0x2f/0xd0
[14526.897622] [<ffffffff810e3d4f>] css_release_work_fn+0x2f/0xd0
[14526.897624] [<ffffffff81092a7a>] swork_kthread+0xfa/0x150
[14526.897625] [<ffffffff81092980>] ? swork_readable+0x40/0x40
[14526.897628] [<ffffffff81070036>] kthread+0xd6/0xf0
[14526.897629] [<ffffffff8107581f>] ? finish_task_switch+0x3f/0x140
[14526.897631] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14526.897632] [<ffffffff81736888>] ret_from_fork+0x58/0x90
[14526.897633] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14526.897634] 1 lock held by kswork/69:
[14526.897639] #0: (cgroup_mutex){......}, at: [<ffffffff810e3d4f>]
css_release_work_fn+0x2f/0xd0
[14526.897680] INFO: task kworker/3:0:10502 blocked for more than 120 seconds.
[14526.897682] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14526.897682] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14526.897683] kworker/3:0 D ffff8803a9426d40 0 10502 2 0x00000000
[14526.897687] Workqueue: cgroup_destroy css_killed_work_fn
[14526.897689] ffff8803a947fb98 0000000000000096 00000000a947fb98
ffff8803a947ffd8
[14526.897690] ffff8803a947ffd8 ffff8803a947ffd8 ffff8803a947ffd8
ffffffff81d25470
[14526.897690] ffff8803dace0000 ffff8800995f2290 ffff8803a947fbb8
ffff8800995f2290
[14526.897692] Call Trace:
[14526.897694] [<ffffffff81732694>] schedule+0x34/0xa0
[14526.897694] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14526.897695] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14526.897696] [<ffffffff8173443e>] ? rt_spin_lock_slowlock+0x5e/0x2c0
[14526.897697] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14526.897698] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14526.897700] [<ffffffff810e549f>] ? css_killed_work_fn+0x1f/0x170
[14526.897701] [<ffffffff810e549f>] css_killed_work_fn+0x1f/0x170
[14526.897702] [<ffffffff8106a92a>] process_one_work+0x1fa/0x5b0
[14526.897703] [<ffffffff8106a88d>] ? process_one_work+0x15d/0x5b0
[14526.897705] [<ffffffff8106ae4b>] worker_thread+0x16b/0x4c0
[14526.897706] [<ffffffff8106ace0>] ? process_one_work+0x5b0/0x5b0
[14526.897707] [<ffffffff81070036>] kthread+0xd6/0xf0
[14526.897708] [<ffffffff8107581f>] ? finish_task_switch+0x3f/0x140
[14526.897710] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14526.897711] [<ffffffff81736888>] ret_from_fork+0x58/0x90
[14526.897712] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14526.897713] 3 locks held by kworker/3:0/10502:
[14526.897719] #0: ("cgroup_destroy"){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[14526.897722] #1: ((&css->destroy_work)){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[14526.897724] #2: (cgroup_mutex){......}, at: [<ffffffff810e549f>]
css_killed_work_fn+0x1f/0x170
[14526.897732] INFO: task lxc-start:21854 blocked for more than 120 seconds.
[14526.897733] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14526.897734] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14526.897735] lxc-start D ffff8803a9422840 0 21854 21848 0x00000000
[14526.897737] ffff880401b33c48 0000000000000096 0000000001b33c48
ffff880401b33fd8
[14526.897738] ffff880401b33fd8 ffff880401b33fd8 ffff880401b33fd8
ffff880401b33d10
[14526.897739] ffff880401940000 ffff8803a7f38000 ffff880401b33c68
ffff8803a7f38000
[14526.897740] Call Trace:
[14526.897742] [<ffffffff81732694>] schedule+0x34/0xa0
[14526.897742] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14526.897743] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14526.897744] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14526.897745] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14526.897747] [<ffffffff810ea122>] ? proc_cgroup_show+0x52/0x200
[14526.897748] [<ffffffff810ea122>] proc_cgroup_show+0x52/0x200
[14526.897751] [<ffffffff81215b64>] proc_single_show+0x54/0xa0
[14526.897753] [<ffffffff811d082d>] seq_read+0xed/0x380
[14526.897754] [<ffffffff811aa32f>] vfs_read+0x9f/0x180
[14526.897755] [<ffffffff811aaea9>] SyS_read+0x49/0xb0
[14526.897756] [<ffffffff81736936>] system_call_fastpath+0x16/0x1b
[14526.897757] 2 locks held by lxc-start/21854:
[14526.897761] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[14526.897764] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[14526.897767] INFO: task lxc-ls:21856 blocked for more than 120 seconds.
[14526.897768] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14526.897769] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14526.897770] lxc-ls D ffff8803a9565640 0 21856 21855 0x00000000
[14526.897772] ffff8803b1103c48 0000000000000096 00000000b1103c48
ffff8803b1103fd8
[14526.897773] ffff8803b1103fd8 ffff8803b1103fd8 ffff8803b1103fd8
ffff8803b1103d10
[14526.897773] ffff880401942290 ffff8803ad9e4520 ffff8803b1103c68
ffff8803ad9e4520
[14526.897775] Call Trace:
[14526.897777] [<ffffffff81732694>] schedule+0x34/0xa0
[14526.897777] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14526.897778] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14526.897779] [<ffffffff810ea103>] ? proc_cgroup_show+0x33/0x200
[14526.897780] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14526.897781] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14526.897782] [<ffffffff810ea122>] ? proc_cgroup_show+0x52/0x200
[14526.897783] [<ffffffff810ea122>] proc_cgroup_show+0x52/0x200
[14526.897785] [<ffffffff81215b64>] proc_single_show+0x54/0xa0
[14526.897786] [<ffffffff811d082d>] seq_read+0xed/0x380
[14526.897787] [<ffffffff811aa32f>] vfs_read+0x9f/0x180
[14526.897788] [<ffffffff811aaea9>] SyS_read+0x49/0xb0
[14526.897789] [<ffffffff81736936>] system_call_fastpath+0x16/0x1b
[14526.897789] 2 locks held by lxc-ls/21856:
[14526.897793] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[14526.897796] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[14646.952905] INFO: task kswork:69 blocked for more than 120 seconds.
[14646.952912] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14646.952914] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14646.952917] kswork D ffff8803fbf1c500 0 69 2 0x00000000
[14646.952925] ffff8804015e3c18 0000000000000092 00000000015e3c18
ffff8804015e3fd8
[14646.952926] ffff8804015e3fd8 ffff8804015e3fd8 ffff8804015e3fd8
ffff8804015e3ce0
[14646.952928] ffff880401928000 ffff8804015d8000 ffff8804015e3c38
ffff8804015d8000
[14646.952932] Call Trace:
[14646.952941] [<ffffffff81732694>] schedule+0x34/0xa0
[14646.952944] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14646.952946] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14646.952948] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14646.952951] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14646.952956] [<ffffffff810e3d4f>] ? css_release_work_fn+0x2f/0xd0
[14646.952960] [<ffffffff810e3d4f>] css_release_work_fn+0x2f/0xd0
[14646.952965] [<ffffffff81092a7a>] swork_kthread+0xfa/0x150
[14646.952968] [<ffffffff81092980>] ? swork_readable+0x40/0x40
[14646.952972] [<ffffffff81070036>] kthread+0xd6/0xf0
[14646.952976] [<ffffffff8107581f>] ? finish_task_switch+0x3f/0x140
[14646.952979] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14646.952982] [<ffffffff81736888>] ret_from_fork+0x58/0x90
[14646.952985] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14646.952987] 1 lock held by kswork/69:
[14646.952997] #0: (cgroup_mutex){......}, at: [<ffffffff810e3d4f>]
css_release_work_fn+0x2f/0xd0
[14646.953052] INFO: task kworker/3:0:10502 blocked for more than 120 seconds.
[14646.953054] Tainted: G E 3.18.17-realtime-2-rt14 #3
[14646.953054] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14646.953055] kworker/3:0 D ffff8803a9426d40 0 10502 2 0x00000000
[14646.953059] Workqueue: cgroup_destroy css_killed_work_fn
[14646.953060] ffff8803a947fb98 0000000000000096 00000000a947fb98
ffff8803a947ffd8
[14646.953061] ffff8803a947ffd8 ffff8803a947ffd8 ffff8803a947ffd8
ffffffff81d25470
[14646.953062] ffff8803dace0000 ffff8800995f2290 ffff8803a947fbb8
ffff8800995f2290
[14646.953063] Call Trace:
[14646.953065] [<ffffffff81732694>] schedule+0x34/0xa0
[14646.953066] [<ffffffff81733dd5>] __rt_mutex_slowlock+0x55/0x1c0
[14646.953067] [<ffffffff81734045>] rt_mutex_slowlock+0x105/0x320
[14646.953067] [<ffffffff8173443e>] ? rt_spin_lock_slowlock+0x5e/0x2c0
[14646.953068] [<ffffffff8173427a>] rt_mutex_lock+0x1a/0x20
[14646.953069] [<ffffffff81735f19>] _mutex_lock+0x39/0x40
[14646.953070] [<ffffffff810e549f>] ? css_killed_work_fn+0x1f/0x170
[14646.953071] [<ffffffff810e549f>] css_killed_work_fn+0x1f/0x170
[14646.953073] [<ffffffff8106a92a>] process_one_work+0x1fa/0x5b0
[14646.953074] [<ffffffff8106a88d>] ? process_one_work+0x15d/0x5b0
[14646.953075] [<ffffffff8106ae4b>] worker_thread+0x16b/0x4c0
[14646.953076] [<ffffffff8106ace0>] ? process_one_work+0x5b0/0x5b0
[14646.953077] [<ffffffff81070036>] kthread+0xd6/0xf0
[14646.953078] [<ffffffff8107581f>] ? finish_task_switch+0x3f/0x140
[14646.953080] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14646.953080] [<ffffffff81736888>] ret_from_fork+0x58/0x90
[14646.953082] [<ffffffff8106ff60>] ? kthread_create_on_node+0x220/0x220
[14646.953083] 3 locks held by kworker/3:0/10502:
[14646.953088] #0: ("cgroup_destroy"){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[14646.953091] #1: ((&css->destroy_work)){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[14646.953094] #2: (cgroup_mutex){......}, at: [<ffffffff810e549f>]
css_killed_work_fn+0x1f/0x170
[16929.175280] SysRq : Show Locks Held
[16929.175286]
[16929.175286] Showing all locks held in the system:
[16929.175301] 1 lock held by kswork/69:
[16929.175302] #0: (cgroup_mutex){......}, at: [<ffffffff810e3d4f>]
css_release_work_fn+0x2f/0xd0
[16929.175316] 2 locks held by systemd-logind/583:
[16929.175317] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[16929.175321] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[16929.175327] 1 lock held by in:imklog/620:
[16929.175327] #0: (&f->f_pos_lock){......}, at:
[<ffffffff811ca69a>] __fdget_pos+0x4a/0x50
[16929.175334] 3 locks held by polkitd/913:
[16929.175334] #0: (&f->f_pos_lock){......}, at:
[<ffffffff811ca69a>] __fdget_pos+0x4a/0x50
[16929.175337] #1: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[16929.175340] #2: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[16929.175346] 2 locks held by getty/1095:
[16929.175347] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175351] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175355] 2 locks held by getty/1098:
[16929.175356] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175358] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175362] 2 locks held by getty/1106:
[16929.175363] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175365] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175368] 2 locks held by getty/1107:
[16929.175369] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175371] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175375] 2 locks held by getty/1110:
[16929.175375] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175378] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175384] 2 locks held by getty/1749:
[16929.175385] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175387] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175415] 1 lock held by rsyslogd/3299:
[16929.175415] #0: (&f->f_pos_lock){......}, at:
[<ffffffff811ca69a>] __fdget_pos+0x4a/0x50
[16929.175420] 2 locks held by getty/3445:
[16929.175421] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175423] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175427] 2 locks held by getty/3452:
[16929.175427] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175429] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175433] 2 locks held by getty/3455:
[16929.175433] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175436] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175440] 2 locks held by getty/3513:
[16929.175441] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175443] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175446] 2 locks held by getty/3515:
[16929.175446] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175449] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175457] 2 locks held by zsh/14000:
[16929.175457] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175460] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175464] 2 locks held by zsh/7684:
[16929.175464] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175466] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175470] 3 locks held by kworker/3:0/10502:
[16929.175470] #0: ("cgroup_destroy"){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[16929.175476] #1: ((&css->destroy_work)){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[16929.175478] #2: (cgroup_mutex){......}, at: [<ffffffff810e549f>]
css_killed_work_fn+0x1f/0x170
[16929.175484] 1 lock held by rsyslogd/16108:
[16929.175485] #0: (&f->f_pos_lock){......}, at:
[<ffffffff811ca69a>] __fdget_pos+0x4a/0x50
[16929.175489] 2 locks held by getty/16596:
[16929.175490] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175492] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175496] 2 locks held by getty/16601:
[16929.175497] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175499] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175502] 2 locks held by getty/16603:
[16929.175503] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175505] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175509] 2 locks held by getty/16621:
[16929.175509] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175511] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175514] 2 locks held by getty/16627:
[16929.175515] #0: (&tty->ldisc_sem){......}, at:
[<ffffffff81451334>] tty_ldisc_ref_wait+0x24/0x60
[16929.175517] #1: (&ldata->atomic_read_lock){......}, at:
[<ffffffff8144cbce>] n_tty_read+0xae/0xb90
[16929.175521] 3 locks held by kworker/2:3/19520:
[16929.175522] #0: ("cgroup_destroy"){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[16929.175524] #1: ((&css->destroy_work)){......}, at:
[<ffffffff8106a88d>] process_one_work+0x15d/0x5b0
[16929.175527] #2: (cgroup_mutex){......}, at: [<ffffffff810e549f>]
css_killed_work_fn+0x1f/0x170
[16929.175531] 2 locks held by lxc-start/21854:
[16929.175531] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[16929.175534] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[16929.175538] 2 locks held by lxc-ls/21856:
[16929.175539] #0: (&p->lock){......}, at: [<ffffffff811d077b>]
seq_read+0x3b/0x380
[16929.175545] #1: (cgroup_mutex){......}, at: [<ffffffff810ea122>]
proc_cgroup_show+0x52/0x200
[16929.175554] 3 locks held by bash/10002:
[16929.175555] #0: (sb_writers#6){......}, at: [<ffffffff811aa5c3>]
vfs_write+0x1b3/0x1f0
[16929.175559] #1: (rcu_read_lock){......}, at: [<ffffffff81455f45>]
__handle_sysrq+0x5/0x1b0
[16929.175563] #2: (tasklist_lock){......}, at: [<ffffffff8109a923>]
debug_show_all_locks+0x43/0x1e0
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