I ran my test set on v5.16-rc2 and observed a process hang. The test work load
repeats file creation on xfs on dm-zoned. This dm-zoned device is on top of 3
dm-linear devices. One of them is dm-linear device on non-zoned NVMe device as
the cache of the dm-zoned device. The other two are dm-linear devices on zoned
SMR HDDs. So far, the hang is recreated 100% with my test system.
The kernel message [2] reported hanging tasks. In the call stack, I observe
wbt_wait(). Also I observed "inflight 1" value in the "rqos/wbt/inflight"
attribute of debug sysfs.
# grep -R . /sys/kernel/debug/block/nvme0n1 | grep inflight
/sys/kernel/debug/block/nvme0n1/rqos/wbt/inflight:0: inflight 1
/sys/kernel/debug/block/nvme0n1/rqos/wbt/inflight:1: inflight 0
/sys/kernel/debug/block/nvme0n1/rqos/wbt/inflight:2: inflight 0
These symptoms look related to another issue reported to linux-block [1]. As
discussed in that thread, I set 0 to /sys/block/nvme0n1/queue/wbt_lat_usec.
With this setting, I observed the hang disappeared. Then this hang I observe
also related to writeback throttling for the NVMe device.
I bisected and found the commit 4f5022453acd ("nvme: wire up completion batching
for the IRQ path") is the trigger commit. I reverted this commit from v5.16-rc2,
and observed the hang disappeared.
Wish this report helps.
[1] https://lore.kernel.org/linux-block/b3ba57a7-d363-9c17-c4be-9dbe86875@xxxxxxxxx
[2]
[76751.973325][ T63] INFO: task kworker/u16:19:255220 blocked for more than 622 seconds.
[76751.981730][ T63] Not tainted 5.16.0-rc2 #1
[76751.986700][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76751.995276][ T63] task:kworker/u16:19 state:D stack: 0 pid:255220 ppid: 2 flags:0x00004000
[76752.004490][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76752.011629][ T63] Call Trace:
[76752.014833][ T63] <TASK>
[76752.017715][ T63] __schedule+0xa09/0x26d0
[76752.022106][ T63] ? io_schedule_timeout+0x190/0x190
[76752.027366][ T63] ? _raw_spin_unlock_irqrestore+0x2d/0x60
[76752.033102][ T63] ? lockdep_hardirqs_on+0x7e/0x100
[76752.038243][ T63] schedule+0xe0/0x270
[76752.042230][ T63] ? rq_qos_wait+0x13b/0x210
[76752.046726][ T63] io_schedule+0xf3/0x170
[76752.050997][ T63] rq_qos_wait+0x140/0x210
[76752.055325][ T63] ? rq_depth_scale_down+0x290/0x290
[76752.060514][ T63] ? karma_partition+0x8b0/0x8b0
[76752.065351][ T63] ? wbt_cleanup_cb+0x80/0x80
[76752.069930][ T63] ? rcu_read_lock_sched_held+0x3f/0x70
[76752.075379][ T63] wbt_wait+0x107/0x260
[76752.079429][ T63] ? wbt_track+0x60/0x60
[76752.083561][ T63] ? blk_mq_submit_bio+0xda5/0x1bb0
[76752.088662][ T63] __rq_qos_throttle+0x4c/0x90
[76752.093317][ T63] blk_mq_submit_bio+0x4df/0x1bb0
[76752.098230][ T63] ? percpu_ref_put_many.constprop.0+0x6a/0x1a0
[76752.104363][ T63] ? blk_mq_try_issue_list_directly+0x410/0x410
[76752.110494][ T63] ? submit_bio_checks+0x17a0/0x17a0
[76752.115653][ T63] ? lock_is_held_type+0xe4/0x140
[76752.120575][ T63] submit_bio_noacct+0x52a/0xa60
[76752.125397][ T63] ? lock_release+0x3a9/0x6d0
[76752.129953][ T63] ? __submit_bio_fops+0x1f0/0x1f0
[76752.134942][ T63] ? lock_downgrade+0x6b0/0x6b0
[76752.139680][ T63] dmz_submit_bio+0x2a4/0x460 [dm_zoned]
[76752.145199][ T63] dmz_chunk_work+0x9c4/0x13b0 [dm_zoned]
[76752.150812][ T63] process_one_work+0x7e9/0x1320
[76752.155642][ T63] ? lock_release+0x6d0/0x6d0
[76752.160197][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76752.165452][ T63] ? rwlock_bug.part.0+0x90/0x90
[76752.170355][ T63] worker_thread+0x59b/0x1010
[76752.174924][ T63] ? process_one_work+0x1320/0x1320
[76752.180005][ T63] kthread+0x3b9/0x490
[76752.183956][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76752.189031][ T63] ? set_kthread_struct+0x100/0x100
[76752.194108][ T63] ret_from_fork+0x22/0x30
[76752.198434][ T63] </TASK>
[76752.201348][ T63] INFO: task kworker/u16:7:265016 blocked for more than 622 seconds.
[76752.209291][ T63] Not tainted 5.16.0-rc2 #1
[76752.214194][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76752.222739][ T63] task:kworker/u16:7 state:D stack: 0 pid:265016 ppid: 2 flags:0x00004000
[76752.231897][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76752.238977][ T63] Call Trace:
[76752.242156][ T63] <TASK>
[76752.244983][ T63] __schedule+0xa09/0x26d0
[76752.249284][ T63] ? io_schedule_timeout+0x190/0x190
[76752.254441][ T63] ? mark_held_locks+0x9e/0xe0
[76752.259083][ T63] ? do_raw_spin_lock+0x11e/0x250
[76752.263989][ T63] schedule+0xe0/0x270
[76752.267941][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76752.273368][ T63] ? down_write+0x130/0x130
[76752.277770][ T63] down_read+0xd0/0x420
[76752.281801][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76752.287402][ T63] dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76752.293003][ T63] ? lock_release+0x6d0/0x6d0
[76752.297577][ T63] process_one_work+0x7e9/0x1320
[76752.302411][ T63] ? lock_release+0x6d0/0x6d0
[76752.306971][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76752.312226][ T63] ? rwlock_bug.part.0+0x90/0x90
[76752.317051][ T63] worker_thread+0x59b/0x1010
[76752.321614][ T63] ? process_one_work+0x1320/0x1320
[76752.326693][ T63] kthread+0x3b9/0x490
[76752.330640][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76752.335710][ T63] ? set_kthread_struct+0x100/0x100
[76752.340782][ T63] ret_from_fork+0x22/0x30
[76752.345096][ T63] </TASK>
[76752.348009][ T63] INFO: task kworker/u16:2:280342 blocked for more than 622 seconds.
[76752.355950][ T63] Not tainted 5.16.0-rc2 #1
[76752.360850][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76752.369395][ T63] task:kworker/u16:2 state:D stack: 0 pid:280342 ppid: 2 flags:0x00004000
[76752.378545][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76752.385612][ T63] Call Trace:
[76752.388779][ T63] <TASK>
[76752.391600][ T63] __schedule+0xa09/0x26d0
[76752.395902][ T63] ? io_schedule_timeout+0x190/0x190
[76752.401061][ T63] ? mark_held_locks+0x9e/0xe0
[76752.405700][ T63] ? do_raw_spin_lock+0x11e/0x250
[76752.410606][ T63] schedule+0xe0/0x270
[76752.414554][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76752.419981][ T63] ? down_write+0x130/0x130
[76752.424381][ T63] down_read+0xd0/0x420
[76752.428415][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76752.434022][ T63] dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76752.440232][ T63] ? dmz_mblock_shrinker_count+0x60/0x60 [dm_zoned]
[76752.446700][ T63] ? finish_wait+0x270/0x270
[76752.451188][ T63] ? dmz_bdev_is_dying+0xaf/0x150 [dm_zoned]
[76752.457062][ T63] dmz_get_chunk_buffer+0x167/0x740 [dm_zoned]
[76752.463110][ T63] dmz_chunk_work+0x968/0x13b0 [dm_zoned]
[76752.468724][ T63] process_one_work+0x7e9/0x1320
[76752.473547][ T63] ? lock_release+0x6d0/0x6d0
[76752.478100][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76752.483356][ T63] ? rwlock_bug.part.0+0x90/0x90
[76752.488183][ T63] worker_thread+0x59b/0x1010
[76752.492751][ T63] ? process_one_work+0x1320/0x1320
[76752.497835][ T63] kthread+0x3b9/0x490
[76752.501781][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76752.506853][ T63] ? set_kthread_struct+0x100/0x100
[76752.511929][ T63] ret_from_fork+0x22/0x30
[76752.516240][ T63] </TASK>
[76752.519162][ T63] INFO: task kworker/u16:0:281230 blocked for more than 623 seconds.
[76752.527109][ T63] Not tainted 5.16.0-rc2 #1
[76752.532004][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76752.540542][ T63] task:kworker/u16:0 state:D stack: 0 pid:281230 ppid: 2 flags:0x00004000
[76752.549697][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76752.556763][ T63] Call Trace:
[76752.559931][ T63] <TASK>
[76752.562753][ T63] __schedule+0xa09/0x26d0
[76752.567056][ T63] ? io_schedule_timeout+0x190/0x190
[76752.572210][ T63] ? mark_held_locks+0x9e/0xe0
[76752.576845][ T63] ? do_raw_spin_lock+0x11e/0x250
[76752.581752][ T63] schedule+0xe0/0x270
[76752.585697][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76752.591133][ T63] ? down_write+0x130/0x130
[76752.595536][ T63] down_read+0xd0/0x420
[76752.599577][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76752.605180][ T63] dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76752.610771][ T63] ? lock_release+0x6d0/0x6d0
[76752.615370][ T63] process_one_work+0x7e9/0x1320
[76752.620197][ T63] ? lock_release+0x6d0/0x6d0
[76752.624749][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76752.630006][ T63] ? rwlock_bug.part.0+0x90/0x90
[76752.634826][ T63] worker_thread+0x59b/0x1010
[76752.639392][ T63] ? process_one_work+0x1320/0x1320
[76752.644469][ T63] kthread+0x3b9/0x490
[76752.648408][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76752.653480][ T63] ? set_kthread_struct+0x100/0x100
[76752.658551][ T63] ret_from_fork+0x22/0x30
[76752.662860][ T63] </TASK>
[76752.665768][ T63] INFO: task kworker/u16:5:282117 blocked for more than 623 seconds.
[76752.673701][ T63] Not tainted 5.16.0-rc2 #1
[76752.678593][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76752.687135][ T63] task:kworker/u16:5 state:D stack: 0 pid:282117 ppid: 2 flags:0x00004000
[76752.696309][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76752.703377][ T63] Call Trace:
[76752.706536][ T63] <TASK>
[76752.709358][ T63] __schedule+0xa09/0x26d0
[76752.713667][ T63] ? io_schedule_timeout+0x190/0x190
[76752.718824][ T63] ? mark_held_locks+0x9e/0xe0
[76752.723463][ T63] ? do_raw_spin_lock+0x11e/0x250
[76752.728367][ T63] schedule+0xe0/0x270
[76752.732317][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76752.737748][ T63] ? down_write+0x130/0x130
[76752.742163][ T63] down_read+0xd0/0x420
[76752.746193][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76752.751797][ T63] dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76752.758006][ T63] ? dmz_mblock_shrinker_count+0x60/0x60 [dm_zoned]
[76752.764476][ T63] ? finish_wait+0x270/0x270
[76752.768942][ T63] ? dmz_bdev_is_dying+0xaf/0x150 [dm_zoned]
[76752.774805][ T63] dmz_get_chunk_buffer+0x167/0x740 [dm_zoned]
[76752.780843][ T63] dmz_chunk_work+0x968/0x13b0 [dm_zoned]
[76752.786458][ T63] process_one_work+0x7e9/0x1320
[76752.791283][ T63] ? lock_release+0x6d0/0x6d0
[76752.795833][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76752.801081][ T63] ? rwlock_bug.part.0+0x90/0x90
[76752.805903][ T63] worker_thread+0x59b/0x1010
[76752.810468][ T63] ? process_one_work+0x1320/0x1320
[76752.815545][ T63] kthread+0x3b9/0x490
[76752.819492][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76752.824561][ T63] ? set_kthread_struct+0x100/0x100
[76752.829640][ T63] ret_from_fork+0x22/0x30
[76752.833953][ T63] </TASK>
[76752.836859][ T63] INFO: task kworker/u16:6:282143 blocked for more than 623 seconds.
[76752.844795][ T63] Not tainted 5.16.0-rc2 #1
[76752.849687][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76752.858227][ T63] task:kworker/u16:6 state:D stack: 0 pid:282143 ppid: 2 flags:0x00004000
[76752.867382][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76752.874451][ T63] Call Trace:
[76752.877613][ T63] <TASK>
[76752.880434][ T63] __schedule+0xa09/0x26d0
[76752.884741][ T63] ? io_schedule_timeout+0x190/0x190
[76752.889900][ T63] ? mark_held_locks+0x9e/0xe0
[76752.894545][ T63] ? do_raw_spin_lock+0x11e/0x250
[76752.899453][ T63] schedule+0xe0/0x270
[76752.903398][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76752.908825][ T63] ? down_write+0x130/0x130
[76752.913232][ T63] down_read+0xd0/0x420
[76752.917267][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76752.922870][ T63] dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76752.928463][ T63] ? lock_release+0x6d0/0x6d0
[76752.933038][ T63] process_one_work+0x7e9/0x1320
[76752.937909][ T63] ? lock_release+0x6d0/0x6d0
[76752.942547][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76752.947815][ T63] ? rwlock_bug.part.0+0x90/0x90
[76752.952630][ T63] worker_thread+0x59b/0x1010
[76752.957196][ T63] ? process_one_work+0x1320/0x1320
[76752.962264][ T63] kthread+0x3b9/0x490
[76752.966205][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76752.971273][ T63] ? set_kthread_struct+0x100/0x100
[76752.976348][ T63] ret_from_fork+0x22/0x30
[76752.980651][ T63] </TASK>
[76752.983562][ T63] INFO: task kworker/u16:8:282144 blocked for more than 623 seconds.
[76752.991519][ T63] Not tainted 5.16.0-rc2 #1
[76752.996416][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76753.004960][ T63] task:kworker/u16:8 state:D stack: 0 pid:282144 ppid: 2 flags:0x00004000
[76753.014107][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76753.021181][ T63] Call Trace:
[76753.024340][ T63] <TASK>
[76753.027175][ T63] __schedule+0xa09/0x26d0
[76753.031475][ T63] ? io_schedule_timeout+0x190/0x190
[76753.036646][ T63] ? mark_held_locks+0x9e/0xe0
[76753.041292][ T63] ? do_raw_spin_lock+0x11e/0x250
[76753.046202][ T63] schedule+0xe0/0x270
[76753.050146][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76753.055577][ T63] ? down_write+0x130/0x130
[76753.059980][ T63] down_read+0xd0/0x420
[76753.064017][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76753.069627][ T63] dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76753.075229][ T63] ? lock_release+0x6d0/0x6d0
[76753.079795][ T63] process_one_work+0x7e9/0x1320
[76753.084614][ T63] ? lock_release+0x6d0/0x6d0
[76753.089184][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76753.094445][ T63] ? rwlock_bug.part.0+0x90/0x90
[76753.099270][ T63] worker_thread+0x59b/0x1010
[76753.103831][ T63] ? process_one_work+0x1320/0x1320
[76753.108911][ T63] kthread+0x3b9/0x490
[76753.112855][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.117927][ T63] ? set_kthread_struct+0x100/0x100
[76753.123001][ T63] ret_from_fork+0x22/0x30
[76753.127309][ T63] </TASK>
[76753.130216][ T63] INFO: task kworker/u16:11:282145 blocked for more than 623 seconds.
[76753.138265][ T63] Not tainted 5.16.0-rc2 #1
[76753.143173][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76753.151716][ T63] task:kworker/u16:11 state:D stack: 0 pid:282145 ppid: 2 flags:0x00004000
[76753.160868][ T63] Workqueue: dmz_cwq_dmz_dml_073 dmz_chunk_work [dm_zoned]
[76753.167938][ T63] Call Trace:
[76753.171098][ T63] <TASK>
[76753.173921][ T63] __schedule+0xa09/0x26d0
[76753.178230][ T63] ? io_schedule_timeout+0x190/0x190
[76753.183387][ T63] ? mark_held_locks+0x9e/0xe0
[76753.188022][ T63] ? do_raw_spin_lock+0x11e/0x250
[76753.192970][ T63] schedule+0xe0/0x270
[76753.196924][ T63] rwsem_down_read_slowpath+0x4e0/0x9b0
[76753.202361][ T63] ? down_write+0x130/0x130
[76753.206759][ T63] down_read+0xd0/0x420
[76753.210800][ T63] ? rwsem_down_read_slowpath+0x9b0/0x9b0
[76753.216400][ T63] dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76753.221994][ T63] ? lock_release+0x6d0/0x6d0
[76753.226567][ T63] process_one_work+0x7e9/0x1320
[76753.231390][ T63] ? lock_release+0x6d0/0x6d0
[76753.235945][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76753.241199][ T63] ? rwlock_bug.part.0+0x90/0x90
[76753.246013][ T63] worker_thread+0x59b/0x1010
[76753.250582][ T63] ? process_one_work+0x1320/0x1320
[76753.255654][ T63] kthread+0x3b9/0x490
[76753.259598][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.264672][ T63] ? set_kthread_struct+0x100/0x100
[76753.269756][ T63] ret_from_fork+0x22/0x30
[76753.274062][ T63] </TASK>
[76753.276968][ T63] INFO: task kworker/u16:13:282147 blocked for more than 623 seconds.
[76753.284988][ T63] Not tainted 5.16.0-rc2 #1
[76753.289905][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76753.298452][ T63] task:kworker/u16:13 state:D stack: 0 pid:282147 ppid: 2 flags:0x00004000
[76753.307600][ T63] Workqueue: dmz_rwq_dmz_dml_073_2 dmz_reclaim_work [dm_zoned]
[76753.315018][ T63] Call Trace:
[76753.318178][ T63] <TASK>
[76753.321005][ T63] __schedule+0xa09/0x26d0
[76753.325311][ T63] ? io_schedule_timeout+0x190/0x190
[76753.330505][ T63] schedule+0xe0/0x270
[76753.334462][ T63] io_schedule+0xf3/0x170
[76753.338665][ T63] bit_wait_io+0x17/0xe0
[76753.342787][ T63] __wait_on_bit+0x5e/0x1b0
[76753.347179][ T63] ? bit_wait_io_timeout+0x160/0x160
[76753.352348][ T63] out_of_line_wait_on_bit+0xc7/0xe0
[76753.357506][ T63] ? __wait_on_bit+0x1b0/0x1b0
[76753.362150][ T63] ? var_wake_function+0x130/0x130
[76753.367148][ T63] dmz_reclaim_copy+0x30c/0x860 [dm_zoned]
[76753.372849][ T63] ? lock_release+0x3a9/0x6d0
[76753.377407][ T63] ? dmz_to_next_set_block+0x11b/0x2b0 [dm_zoned]
[76753.383709][ T63] ? dmz_reclaim_kcopy_end+0x80/0x80 [dm_zoned]
[76753.389854][ T63] ? _raw_spin_unlock+0x29/0x40
[76753.394583][ T63] ? dmz_to_next_set_block+0x11b/0x2b0 [dm_zoned]
[76753.400898][ T63] dmz_reclaim_work+0xfe2/0x16c0 [dm_zoned]
[76753.406675][ T63] ? lock_downgrade+0x6b0/0x6b0
[76753.411410][ T63] ? dmz_reclaim_copy+0x860/0x860 [dm_zoned]
[76753.417275][ T63] process_one_work+0x7e9/0x1320
[76753.422103][ T63] ? lock_release+0x6d0/0x6d0
[76753.426659][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76753.431922][ T63] ? rwlock_bug.part.0+0x90/0x90
[76753.436748][ T63] worker_thread+0x59b/0x1010
[76753.441313][ T63] ? process_one_work+0x1320/0x1320
[76753.446390][ T63] kthread+0x3b9/0x490
[76753.450335][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.455408][ T63] ? set_kthread_struct+0x100/0x100
[76753.460478][ T63] ret_from_fork+0x22/0x30
[76753.464793][ T63] </TASK>
[76753.467708][ T63] INFO: task kworker/4:3:282754 blocked for more than 624 seconds.
[76753.475464][ T63] Not tainted 5.16.0-rc2 #1
[76753.480356][ T63] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[76753.488899][ T63] task:kworker/4:3 state:D stack: 0 pid:282754 ppid: 2 flags:0x00004000
[76753.498052][ T63] Workqueue: kcopyd do_work
[76753.502432][ T63] Call Trace:
[76753.505599][ T63] <TASK>
[76753.508419][ T63] __schedule+0xa09/0x26d0
[76753.512722][ T63] ? io_schedule_timeout+0x190/0x190
[76753.517880][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.522958][ T63] schedule+0xe0/0x270
[76753.526905][ T63] ? rq_qos_wait+0x13b/0x210
[76753.531374][ T63] io_schedule+0xf3/0x170
[76753.535587][ T63] rq_qos_wait+0x140/0x210
[76753.539909][ T63] ? rq_depth_scale_down+0x290/0x290
[76753.545080][ T63] ? karma_partition+0x8b0/0x8b0
[76753.549893][ T63] ? wbt_cleanup_cb+0x80/0x80
[76753.554446][ T63] ? rcu_read_lock_sched_held+0x3f/0x70
[76753.559872][ T63] wbt_wait+0x107/0x260
[76753.563903][ T63] ? wbt_track+0x60/0x60
[76753.568021][ T63] ? blk_mq_submit_bio+0xda5/0x1bb0
[76753.573107][ T63] __rq_qos_throttle+0x4c/0x90
[76753.577765][ T63] blk_mq_submit_bio+0x4df/0x1bb0
[76753.582666][ T63] ? percpu_ref_put_many.constprop.0+0x6a/0x1a0
[76753.588785][ T63] ? blk_mq_try_issue_list_directly+0x410/0x410
[76753.594923][ T63] ? submit_bio_checks+0x17a0/0x17a0
[76753.600081][ T63] ? find_held_lock+0x2c/0x110
[76753.604731][ T63] submit_bio_noacct+0x52a/0xa60
[76753.609550][ T63] ? lock_downgrade+0x6b0/0x6b0
[76753.614279][ T63] ? __submit_bio_fops+0x1f0/0x1f0
[76753.619262][ T63] ? lock_is_held_type+0xe4/0x140
[76753.624187][ T63] ? __bio_add_page+0x254/0x420
[76753.628923][ T63] submit_bio+0x149/0x340
[76753.633132][ T63] ? submit_bio_noacct+0xa60/0xa60
[76753.638121][ T63] dispatch_io+0x3af/0x9c0
[76753.642429][ T63] ? endio+0x110/0x110
[76753.646374][ T63] ? mempool_alloc+0xfe/0x2d0
[76753.650965][ T63] ? mempool_resize+0x720/0x720
[76753.655700][ T63] ? dm_interface_exit+0x20/0x20
[76753.660521][ T63] ? list_get_page+0x1a0/0x1a0
[76753.665174][ T63] ? do_raw_spin_lock+0x11e/0x250
[76753.670087][ T63] ? dm_kcopyd_do_callback+0x270/0x270
[76753.675427][ T63] dm_io+0x3dd/0x8a0
[76753.679210][ T63] ? sync_io+0x390/0x390
[76753.683326][ T63] ? dm_interface_exit+0x20/0x20
[76753.688139][ T63] ? list_get_page+0x1a0/0x1a0
[76753.692776][ T63] ? do_raw_spin_lock+0x11e/0x250
[76753.697675][ T63] ? lockdep_hardirqs_on_prepare+0x17b/0x410
[76753.703527][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.708605][ T63] run_io_job+0x2fb/0x630
[76753.712814][ T63] ? lock_release+0x3a9/0x6d0
[76753.717365][ T63] ? dm_kcopyd_prepare_callback+0x120/0x120
[76753.723137][ T63] ? dm_kcopyd_do_callback+0x270/0x270
[76753.728472][ T63] ? lockdep_hardirqs_on_prepare+0x17b/0x410
[76753.734323][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.739399][ T63] process_jobs.isra.0+0x111/0xa40
[76753.744389][ T63] ? dm_kcopyd_prepare_callback+0x120/0x120
[76753.750170][ T63] ? lockdep_hardirqs_on_prepare+0x17b/0x410
[76753.756016][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.761091][ T63] do_work+0x1cf/0x2c0
[76753.765043][ T63] ? process_jobs.isra.0+0xa40/0xa40
[76753.770205][ T63] ? lock_downgrade+0x6b0/0x6b0
[76753.774941][ T63] ? lock_is_held_type+0xe4/0x140
[76753.779849][ T63] process_one_work+0x7e9/0x1320
[76753.784670][ T63] ? lock_release+0x6d0/0x6d0
[76753.789222][ T63] ? pwq_dec_nr_in_flight+0x230/0x230
[76753.794487][ T63] ? rwlock_bug.part.0+0x90/0x90
[76753.799309][ T63] worker_thread+0x59b/0x1010
[76753.803868][ T63] ? process_one_work+0x1320/0x1320
[76753.808942][ T63] kthread+0x3b9/0x490
[76753.812887][ T63] ? _raw_spin_unlock_irq+0x24/0x50
[76753.817960][ T63] ? set_kthread_struct+0x100/0x100
[76753.823032][ T63] ret_from_fork+0x22/0x30
[76753.827338][ T63] </TASK>
[76753.830261][ T63]
[76753.830261][ T63] Showing all locks held in the system:
[76753.837862][ T63] 1 lock held by khungtaskd/63:
[76753.842589][ T63] #0: ffffffff9645e760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260
[76753.852283][ T63] 1 lock held by systemd-journal/580:
[76753.857552][ T63] 3 locks held by kworker/u16:19/255220:
[76753.863054][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76753.874381][ T63] #1: ffff8884e2097dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76753.885192][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76753.896179][ T63] 3 locks held by kworker/u16:7/265016:
[76753.901596][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76753.912921][ T63] #1: ffff88833c2dfdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76753.923733][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76753.934117][ T63] 3 locks held by kworker/u16:2/280342:
[76753.939540][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76753.950870][ T63] #1: ffff88816aab7dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76753.961712][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76753.972690][ T63] 3 locks held by kworker/u16:0/281230:
[76753.978102][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76753.989429][ T63] #1: ffff88811a28fdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.000232][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.010608][ T63] 3 locks held by kworker/u16:5/282117:
[76754.016021][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.027375][ T63] #1: ffff888139357dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.038183][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76754.049180][ T63] 3 locks held by kworker/u16:6/282143:
[76754.054604][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.065925][ T63] #1: ffff8881472efdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.076724][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.087103][ T63] 3 locks held by kworker/u16:8/282144:
[76754.092529][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.103851][ T63] #1: ffff888114a77dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.114651][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.125034][ T63] 3 locks held by kworker/u16:11/282145:
[76754.130533][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.141856][ T63] #1: ffff888169827dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.152665][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.163046][ T63] 2 locks held by kworker/u16:13/282147:
[76754.168547][ T63] #0: ffff88814f7b9938 ((wq_completion)dmz_rwq_dmz_dml_073_2){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.180041][ T63] #1: ffff888143cafdd8 ((work_completion)(&(&zrc->work)->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.191726][ T63] 2 locks held by kworker/4:3/282754:
[76754.196970][ T63] #0: ffff88816dd19d38 ((wq_completion)kcopyd#2){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.207344][ T63] #1: ffff888113547dd8 ((work_completion)(&kc->kcopyd_work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.218759][ T63] 3 locks held by kworker/u16:18/283196:
[76754.224261][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.235589][ T63] #1: ffff888134f1fdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.246396][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.256777][ T63] 3 locks held by kworker/u16:20/283222:
[76754.262278][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.273600][ T63] #1: ffff88814ed87dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.284401][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.294790][ T63] 3 locks held by kworker/u16:28/283657:
[76754.300298][ T63] #0: ffff888142784938 ((wq_completion)dmz_rwq_dmz_dml_073_1){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.311794][ T63] #1: ffff88814934fdd8 ((work_completion)(&(&zrc->work)->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.323474][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_flush_metadata+0x8f/0x8a0 [dm_zoned]
[76754.334033][ T63] 3 locks held by kworker/u16:30/283684:
[76754.339547][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.350886][ T63] #1: ffff88815358fdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.361707][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76754.372708][ T63] 3 locks held by kworker/u16:33/283687:
[76754.378224][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.389566][ T63] #1: ffff888147d87dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.400401][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_wait_for_free_zones+0xd3/0x110 [dm_zoned]
[76754.411400][ T63] 3 locks held by kworker/u16:34/283706:
[76754.416903][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.428224][ T63] #1: ffff888151fdfdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.439022][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.449392][ T63] 3 locks held by kworker/u16:38/284513:
[76754.454895][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.466210][ T63] #1: ffff888137e97dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.477010][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.487380][ T63] 3 locks held by kworker/u16:42/284517:
[76754.492877][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.504198][ T63] #1: ffff888101497dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.514995][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.525369][ T63] 3 locks held by kworker/u16:52/285020:
[76754.530867][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.542198][ T63] #1: ffff8881384afdd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.553006][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.563382][ T63] 2 locks held by fio/289454:
[76754.567924][ T63] #0: ffff88857abd6750 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x340
[76754.579167][ T63] #1: ffff888517fa6990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xd65/0x1190
[76754.588602][ T63] 2 locks held by fio/289463:
[76754.593154][ T63] #0: ffff8885b974c980 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: ext4_buffered_write_iter+0xa0/0x340
[76754.604386][ T63] #1: ffff888517fa6990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xd65/0x1190
[76754.613805][ T63] 3 locks held by kworker/u16:1/289464:
[76754.619217][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.630534][ T63] #1: ffff88816ac87dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.641332][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.651729][ T63] 3 locks held by kworker/u16:3/289465:
[76754.657156][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.668479][ T63] #1: ffff888139597dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.679276][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.689647][ T63] 3 locks held by kworker/u16:4/289467:
[76754.695058][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.706376][ T63] #1: ffff888193417dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.717195][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.727565][ T63] 3 locks held by kworker/u16:9/289468:
[76754.732977][ T63] #0: ffff888142780938 ((wq_completion)dmz_fwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.744295][ T63] #1: ffff8881258dfdd8 ((work_completion)(&(&dmz->flush_work)->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.756481][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_flush_metadata+0x8f/0x8a0 [dm_zoned]
[76754.767025][ T63] 3 locks held by kworker/u16:10/289469:
[76754.772524][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.783847][ T63] #1: ffff88816c537dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.794649][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.805021][ T63] 3 locks held by kworker/u16:14/289471:
[76754.810519][ T63] #0: ffff888142785938 ((wq_completion)dmz_cwq_dmz_dml_073){+.+.}-{0:0}, at: process_one_work+0x712/0x1320
[76754.821838][ T63] #1: ffff8881249c7dd8 ((work_completion)(&cw->work)){+.+.}-{0:0}, at: process_one_work+0x73f/0x1320
[76754.832637][ T63] #2: ffff8881348291f0 (&zmd->mblk_sem){++++}-{3:3}, at: dmz_chunk_work+0x140/0x13b0 [dm_zoned]
[76754.843011][ T63]
[76754.845221][ T63] =============================================
[76754.845221][ T63]
--
Best Regards,
Shin'ichiro Kawasaki
