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Date: Mon, 30 Jul 2018 23:34:23 +0900
From: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To: Michal Hocko <mhocko@...nel.org>
Cc: Roman Gushchin <guro@...com>, Johannes Weiner <hannes@...xchg.org>,
Vladimir Davydov <vdavydov.dev@...il.com>,
David Rientjes <rientjes@...gle.com>,
Tejun Heo <tj@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-mm <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm,page_alloc: PF_WQ_WORKER threads must sleep at
should_reclaim_retry().
On 2018/07/30 18:32, Michal Hocko wrote:
>>>> Since the patch shown below was suggested by Michal Hocko at
>>>> https://marc.info/?l=linux-mm&m=152723708623015 , it is from Michal Hocko.
>>>>
>>>> >From cd8095242de13ace61eefca0c3d6f2a5a7b40032 Mon Sep 17 00:00:00 2001
>>>> From: Michal Hocko <mhocko@...e.com>
>>>> Date: Thu, 26 Jul 2018 14:40:03 +0900
>>>> Subject: [PATCH] mm,page_alloc: PF_WQ_WORKER threads must sleep at should_reclaim_retry().
>>>>
>>>> Tetsuo Handa has reported that it is possible to bypass the short sleep
>>>> for PF_WQ_WORKER threads which was introduced by commit 373ccbe5927034b5
>>>> ("mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make
>>>> any progress") and moved by commit ede37713737834d9 ("mm: throttle on IO
>>>> only when there are too many dirty and writeback pages") and lock up the
>>>> system if OOM.
>>>>
>>>> This is because we are implicitly counting on falling back to
>>>> schedule_timeout_uninterruptible() in __alloc_pages_may_oom() when
>>>> schedule_timeout_uninterruptible() in should_reclaim_retry() was not
>>>> called due to __zone_watermark_ok() == false.
>>>
>>> How do we rely on that?
>>
>> Unless disk_events_workfn() (PID=5) sleeps at schedule_timeout_uninterruptible()
>> in __alloc_pages_may_oom(), drain_local_pages_wq() which a thread doing __GFP_FS
>> allocation (PID=498) is waiting for cannot be started.
>
> Now you are losing me again. What is going on about
> drain_local_pages_wq? I can see that all __GFP_FS allocations are
> waiting for a completion which depends on the kworker context to run but
> I fail to see why drain_local_pages_wq matters. The memory on the pcp
> lists is not accounted to NR_FREE_PAGES IIRC but that should be a
> relatively small amount of memory so this cannot be a fundamental
> problem here.
If you look at "busy workqueues and worker pools", you will find that not only
vmstat_update and drain_local_pages_wq (which is WQ_MEM_RECLAIM) but also
other works such as xlog_cil_push_work and xfs_reclaim_worker (which is also
WQ_MEM_RECLAIM) remain "pending:" state.
[ 324.960731] Showing busy workqueues and worker pools:
[ 324.962577] workqueue events: flags=0x0
[ 324.964137] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256
[ 324.966231] pending: vmw_fb_dirty_flush [vmwgfx], vmstat_shepherd, vmpressure_work_fn, free_work, mmdrop_async_fn, mmdrop_async_fn, mmdrop_async_fn, mmdrop_async_fn, e1000_watchdog [e1000], mmdrop_async_fn, mmdrop_async_fn, check_corruption, console_callback
[ 324.973425] workqueue events_freezable: flags=0x4
[ 324.975247] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 324.977393] pending: vmballoon_work [vmw_balloon]
[ 324.979310] workqueue events_power_efficient: flags=0x80
[ 324.981298] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=5/256
[ 324.983543] pending: gc_worker [nf_conntrack], fb_flashcursor, neigh_periodic_work, neigh_periodic_work, check_lifetime
[ 324.987240] workqueue events_freezable_power_: flags=0x84
[ 324.989292] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 324.991482] in-flight: 5:disk_events_workfn
[ 324.993371] workqueue mm_percpu_wq: flags=0x8
[ 324.995167] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[ 324.997363] pending: vmstat_update, drain_local_pages_wq BAR(498)
[ 324.999977] workqueue ipv6_addrconf: flags=0x40008
[ 325.001899] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1
[ 325.004092] pending: addrconf_verify_work
[ 325.005911] workqueue mpt_poll_0: flags=0x8
[ 325.007686] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 325.009914] pending: mpt_fault_reset_work [mptbase]
[ 325.012044] workqueue xfs-cil/sda1: flags=0xc
[ 325.013897] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 325.016190] pending: xlog_cil_push_work [xfs] BAR(2344)
[ 325.018354] workqueue xfs-reclaim/sda1: flags=0xc
[ 325.020293] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 325.022549] pending: xfs_reclaim_worker [xfs]
[ 325.024540] workqueue xfs-sync/sda1: flags=0x4
[ 325.026425] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 325.028691] pending: xfs_log_worker [xfs]
[ 325.030546] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=189s workers=4 idle: 977 65 13
[ 444.206334] Showing busy workqueues and worker pools:
[ 444.208472] workqueue events: flags=0x0
[ 444.210193] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=15/256
[ 444.212389] pending: vmw_fb_dirty_flush [vmwgfx], vmstat_shepherd, vmpressure_work_fn, free_work, mmdrop_async_fn, mmdrop_async_fn, mmdrop_async_fn, mmdrop_async_fn, e1000_watchdog [e1000], mmdrop_async_fn, mmdrop_async_fn, check_corruption, console_callback, sysrq_reinject_alt_sysrq, moom_callback
[ 444.220547] workqueue events_freezable: flags=0x4
[ 444.222562] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.224852] pending: vmballoon_work [vmw_balloon]
[ 444.227022] workqueue events_power_efficient: flags=0x80
[ 444.229103] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=5/256
[ 444.231271] pending: gc_worker [nf_conntrack], fb_flashcursor, neigh_periodic_work, neigh_periodic_work, check_lifetime
[ 444.234824] workqueue events_freezable_power_: flags=0x84
[ 444.236937] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.239138] in-flight: 5:disk_events_workfn
[ 444.241022] workqueue mm_percpu_wq: flags=0x8
[ 444.242829] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256
[ 444.245057] pending: vmstat_update, drain_local_pages_wq BAR(498)
[ 444.247646] workqueue ipv6_addrconf: flags=0x40008
[ 444.249582] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1
[ 444.251784] pending: addrconf_verify_work
[ 444.253620] workqueue mpt_poll_0: flags=0x8
[ 444.255427] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.257666] pending: mpt_fault_reset_work [mptbase]
[ 444.259800] workqueue xfs-cil/sda1: flags=0xc
[ 444.261646] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.263903] pending: xlog_cil_push_work [xfs] BAR(2344)
[ 444.266101] workqueue xfs-reclaim/sda1: flags=0xc
[ 444.268104] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.270454] pending: xfs_reclaim_worker [xfs]
[ 444.272425] workqueue xfs-eofblocks/sda1: flags=0xc
[ 444.274432] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.276729] pending: xfs_eofblocks_worker [xfs]
[ 444.278739] workqueue xfs-sync/sda1: flags=0x4
[ 444.280641] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 444.282967] pending: xfs_log_worker [xfs]
[ 444.285195] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=309s workers=3 idle: 977 65
>>>> Tetsuo is observing that GFP_NOIO
>>>> allocation request from disk_events_workfn() is preventing other pending
>>>> works from starting.
>>>
>>> What about any other allocation from !PF_WQ_WORKER context? Why those do
>>> not jump in?
>>
>> All __GFP_FS allocations got stuck at direct reclaim or workqueue.
>>
>>>
>>>> Since should_reclaim_retry() should be a natural reschedule point,
>>>> let's do the short sleep for PF_WQ_WORKER threads unconditionally
>>>> in order to guarantee that other pending works are started.
>>>
>>> OK, this is finally makes some sense. But it doesn't explain why it
>>> handles the live lock.
>>
>> As explained above, if disk_events_workfn() (PID=5) explicitly sleeps,
>> vmstat_update and drain_local_pages_wq from WQ_MEM_RECLAIM workqueue will
>> start, and unblock PID=498 which is waiting for drain_local_pages_wq and
>> allow PID=498 to invoke the OOM killer.
>
> [ 313.714537] systemd-journal D12600 498 1 0x00000000
> [ 313.716538] Call Trace:
> [ 313.717683] ? __schedule+0x245/0x7f0
> [ 313.719221] schedule+0x23/0x80
> [ 313.720586] schedule_timeout+0x21f/0x400
> [ 313.722163] wait_for_completion+0xb2/0x130
> [ 313.723750] ? wake_up_q+0x70/0x70
> [ 313.725134] flush_work+0x1db/0x2b0
> [ 313.726535] ? flush_workqueue_prep_pwqs+0x1b0/0x1b0
> [ 313.728336] ? page_alloc_cpu_dead+0x30/0x30
> [ 313.729936] drain_all_pages+0x174/0x1e0
> [ 313.731446] __alloc_pages_slowpath+0x428/0xc50
> [ 313.733120] __alloc_pages_nodemask+0x2a6/0x2c0
> [ 313.734826] filemap_fault+0x437/0x8e0
> [ 313.736296] ? lock_acquire+0x51/0x70
> [ 313.737769] ? xfs_ilock+0x86/0x190 [xfs]
> [ 313.739309] __xfs_filemap_fault.constprop.21+0x37/0xc0 [xfs]
> [ 313.741291] __do_fault+0x13/0x126
> [ 313.742667] __handle_mm_fault+0xc8d/0x11c0
> [ 313.744245] handle_mm_fault+0x17a/0x390
> [ 313.745755] __do_page_fault+0x24c/0x4d0
> [ 313.747290] do_page_fault+0x2a/0x70
> [ 313.748728] ? page_fault+0x8/0x30
> [ 313.750148] page_fault+0x1e/0x30
>
> This one is waiting for draining and we are in mm_percpu_wq WQ context
> which has its rescuer so no other activity can block us for ever. So
> this certainly shouldn't deadlock. It can be dead slow but well, this is
> what you will get when your shoot your system to death.
We need schedule_timeout_*() to allow such WQ_MEM_RECLAIM workqueues to wake up. (Tejun,
is my understanding correct?) Lack of schedule_timeout_*() does block WQ_MEM_RECLAIM
workqueues forever.
Did you count how many threads were running from SysRq-t output?
If you did, you won't say "when you shoot your system to death". :-(
(Tester processes stuck at D state are omitted from below excerpt.
You can see that the system is almost idle.)
[ 310.265293] systemd D12240 1 0 0x00000000
[ 310.345487] kthreadd S14024 2 0 0x80000000
[ 310.355813] rcu_gp I15176 3 2 0x80000000
[ 310.369297] rcu_par_gp I15176 4 2 0x80000000
[ 310.383005] kworker/0:0 R running task 13504 5 2 0x80000000
[ 310.385328] Workqueue: events_freezable_power_ disk_events_workfn
[ 310.510953] kworker/0:0H I14648 6 2 0x80000000
[ 310.513024] Workqueue: (null) (xfs-log/sda1)
[ 310.527289] kworker/u256:0 I12816 7 2 0x80000000
[ 310.529282] Workqueue: (null) (events_unbound)
[ 310.543584] mm_percpu_wq I15176 8 2 0x80000000
[ 310.557527] ksoftirqd/0 S14664 9 2 0x80000000
[ 310.573041] rcu_sched I14360 10 2 0x80000000
[ 310.586582] rcu_bh I15192 11 2 0x80000000
[ 310.603372] migration/0 S14664 12 2 0x80000000
[ 310.617362] kworker/0:1 I13312 13 2 0x80000000
[ 310.619297] Workqueue: (null) (cgroup_pidlist_destroy)
[ 310.633055] cpuhp/0 S13920 14 2 0x80000000
[ 310.647134] cpuhp/1 P13992 15 2 0x80000000
[ 310.662731] migration/1 P14664 16 2 0x80000000
[ 310.678559] ksoftirqd/1 P14656 17 2 0x80000000
[ 310.694278] kworker/1:0 I13808 18 2 0x80000000
[ 310.696221] Workqueue: (null) (events)
[ 310.709753] kworker/1:0H I14648 19 2 0x80000000
[ 310.711701] Workqueue: (null) (kblockd)
[ 310.725166] cpuhp/2 P13992 20 2 0x80000000
[ 310.740708] migration/2 P14664 21 2 0x80000000
[ 310.756255] ksoftirqd/2 P14664 22 2 0x80000000
[ 310.771832] kworker/2:0 I14648 23 2 0x80000000
[ 310.773789] Workqueue: (null) (events)
[ 310.787215] kworker/2:0H I14480 24 2 0x80000000
[ 310.789156] Workqueue: (null) (xfs-log/sda1)
[ 310.802735] cpuhp/3 P14056 25 2 0x80000000
[ 310.818282] migration/3 P14664 26 2 0x80000000
[ 310.833806] ksoftirqd/3 P14600 27 2 0x80000000
[ 310.849330] kworker/3:0 I14648 28 2 0x80000000
[ 310.851269] Workqueue: (null) (events)
[ 310.864855] kworker/3:0H I15192 29 2 0x80000000
[ 310.878479] cpuhp/4 P13696 30 2 0x80000000
[ 310.894006] migration/4 P14664 31 2 0x80000000
[ 310.909697] ksoftirqd/4 P14664 32 2 0x80000000
[ 310.925546] kworker/4:0 I14464 33 2 0x80000000
[ 310.927482] Workqueue: (null) (events)
[ 310.940917] kworker/4:0H I14808 34 2 0x80000000
[ 310.942872] Workqueue: (null) (kblockd)
[ 310.956699] cpuhp/5 P13960 35 2 0x80000000
[ 310.972274] migration/5 P14664 36 2 0x80000000
[ 310.987850] ksoftirqd/5 P14664 37 2 0x80000000
[ 311.003382] kworker/5:0 I14400 38 2 0x80000000
[ 311.005322] Workqueue: (null) (events)
[ 311.018758] kworker/5:0H I15184 39 2 0x80000000
[ 311.032629] cpuhp/6 P14024 40 2 0x80000000
[ 311.048609] migration/6 P14664 41 2 0x80000000
[ 311.064377] ksoftirqd/6 P14600 42 2 0x80000000
[ 311.079858] kworker/6:0 I14616 43 2 0x80000000
[ 311.081800] Workqueue: (null) (cgroup_pidlist_destroy)
[ 311.095610] kworker/6:0H I14616 44 2 0x80000000
[ 311.097549] Workqueue: (null) (kblockd)
[ 311.111033] cpuhp/7 P13992 45 2 0x80000000
[ 311.127639] migration/7 P14664 46 2 0x80000000
[ 311.143797] ksoftirqd/7 P14856 47 2 0x80000000
[ 311.159383] kworker/7:0 I14576 48 2 0x80000000
[ 311.161324] Workqueue: (null) (events)
[ 311.174750] kworker/7:0H I14808 49 2 0x80000000
[ 311.176690] Workqueue: (null) (xfs-log/sda1)
[ 311.190305] kdevtmpfs S13552 50 2 0x80000000
[ 311.205199] netns I15152 51 2 0x80000000
[ 311.218718] kworker/1:1 I14808 52 2 0x80000000
[ 311.220630] Workqueue: (null) (ata_sff)
[ 311.234003] kauditd S14640 53 2 0x80000000
[ 311.251581] khungtaskd S14368 54 2 0x80000000
[ 311.268573] oom_reaper S14464 55 2 0x80000000
[ 311.283432] writeback I15152 56 2 0x80000000
[ 311.296825] kcompactd0 S14856 57 2 0x80000000
[ 311.311451] ksmd S15032 58 2 0x80000000
[ 311.331290] khugepaged D13832 59 2 0x80000000
[ 311.402468] crypto I15192 60 2 0x80000000
[ 311.421397] kintegrityd I15152 61 2 0x80000000
[ 311.435436] kblockd I15192 62 2 0x80000000
[ 311.449503] kworker/3:1 I14264 63 2 0x80000000
[ 311.451420] Workqueue: (null) (events)
[ 311.464883] kworker/5:1 I13568 64 2 0x80000000
[ 311.466846] Workqueue: (null) (events)
[ 311.480784] kworker/0:2 I13104 65 2 0x80000000
[ 311.482780] Workqueue: (null) (cgroup_pidlist_destroy)
[ 311.497643] md I15152 66 2 0x80000000
[ 311.513651] edac-poller I15192 67 2 0x80000000
[ 311.528223] devfreq_wq I15152 68 2 0x80000000
[ 311.542243] watchdogd S15192 69 2 0x80000000
[ 311.557627] kworker/2:1 I13848 70 2 0x80000000
[ 311.559557] Workqueue: (null) (cgroup_pidlist_destroy)
[ 311.573158] kswapd0 S11528 71 2 0x80000000
[ 311.588482] kworker/4:1 I13976 82 2 0x80000000
[ 311.590418] Workqueue: (null) (events)
[ 311.603683] kthrotld I14712 88 2 0x80000000
[ 311.617936] kworker/6:1 I14280 89 2 0x80000000
[ 311.619855] Workqueue: (null) (events)
[ 311.633386] kworker/7:1 I13976 90 2 0x80000000
[ 311.635309] Workqueue: (null) (events_power_efficient)
[ 311.649001] acpi_thermal_pm I14856 91 2 0x80000000
[ 311.662606] kworker/u256:1 I13168 92 2 0x80000000
[ 311.664551] Workqueue: (null) (events_unbound)
[ 311.678115] kmpath_rdacd I15176 93 2 0x80000000
[ 311.691756] kaluad I14712 94 2 0x80000000
[ 311.705839] nvme-wq I14712 95 2 0x80000000
[ 311.720293] nvme-reset-wq I14712 96 2 0x80000000
[ 311.734252] nvme-delete-wq I15176 97 2 0x80000000
[ 311.747801] kworker/u256:2 I14088 98 2 0x80000000
[ 311.749766] Workqueue: (null) (events_unbound)
[ 311.763307] kworker/u256:3 I13560 99 2 0x80000000
[ 311.765273] Workqueue: (null) (events_unbound)
[ 311.778791] ipv6_addrconf I15176 100 2 0x80000000
[ 311.792413] kworker/5:2 I14728 134 2 0x80000000
[ 311.794381] Workqueue: (null) (events)
[ 311.809119] kworker/2:2 I13952 156 2 0x80000000
[ 311.811554] Workqueue: (null) (events)
[ 311.829185] kworker/6:2 I14264 158 2 0x80000000
[ 311.831332] Workqueue: (null) (events)
[ 311.844858] kworker/4:2 I14648 200 2 0x80000000
[ 311.846876] Workqueue: (null) (cgroup_pidlist_destroy)
[ 311.860651] kworker/3:2 I14728 251 2 0x80000000
[ 311.862598] Workqueue: (null) (cgroup_pidlist_destroy)
[ 311.876388] kworker/7:2 I13520 282 2 0x80000000
[ 311.878336] Workqueue: (null) (events)
[ 311.891701] ata_sff I15152 284 2 0x80000000
[ 311.905381] scsi_eh_0 S14504 285 2 0x80000000
[ 311.922693] scsi_tmf_0 I14952 286 2 0x80000000
[ 311.936327] scsi_eh_1 S13560 287 2 0x80000000
[ 311.953512] scsi_tmf_1 I14952 288 2 0x80000000
[ 311.967137] mpt_poll_0 I15152 289 2 0x80000000
[ 311.980810] mpt/0 I14952 290 2 0x80000000
[ 311.994421] scsi_eh_2 S13320 291 2 0x80000000
[ 312.011558] scsi_tmf_2 I15152 292 2 0x80000000
[ 312.026613] scsi_eh_3 S13656 293 2 0x80000000
[ 312.046380] scsi_tmf_3 I15152 294 2 0x80000000
[ 312.063536] scsi_eh_4 S13656 295 2 0x80000000
[ 312.082705] scsi_tmf_4 I15176 296 2 0x80000000
[ 312.097973] scsi_eh_5 S13320 297 2 0x80000000
[ 312.117232] scsi_tmf_5 I15152 298 2 0x80000000
[ 312.132573] scsi_eh_6 S13320 299 2 0x80000000
[ 312.151843] scsi_tmf_6 I15152 300 2 0x80000000
[ 312.167109] ttm_swap I15176 301 2 0x80000000
[ 312.182415] scsi_eh_7 S13320 302 2 0x80000000
[ 312.201595] scsi_tmf_7 I15064 303 2 0x80000000
[ 312.216695] scsi_eh_8 S13320 304 2 0x80000000
[ 312.236470] scsi_tmf_8 I14856 305 2 0x80000000
[ 312.251403] scsi_eh_9 S13656 306 2 0x80000000
[ 312.270443] scsi_tmf_9 I15152 307 2 0x80000000
[ 312.284642] irq/16-vmwgfx S14784 308 2 0x80000000
[ 312.301877] scsi_eh_10 S13320 309 2 0x80000000
[ 312.319679] scsi_tmf_10 I15152 310 2 0x80000000
[ 312.333461] scsi_eh_11 S13320 311 2 0x80000000
[ 312.350681] scsi_tmf_11 I15176 312 2 0x80000000
[ 312.364444] scsi_eh_12 S13656 313 2 0x80000000
[ 312.382093] scsi_tmf_12 I15152 314 2 0x80000000
[ 312.395952] scsi_eh_13 S13656 315 2 0x80000000
[ 312.413378] scsi_tmf_13 I15032 316 2 0x80000000
[ 312.427103] scsi_eh_14 S13624 317 2 0x80000000
[ 312.444286] scsi_tmf_14 I15176 318 2 0x80000000
[ 312.457978] scsi_eh_15 S15192 319 2 0x80000000
[ 312.477516] scsi_tmf_15 I15176 320 2 0x80000000
[ 312.491641] scsi_eh_16 S13656 321 2 0x80000000
[ 312.509443] scsi_tmf_16 I15032 322 2 0x80000000
[ 312.523573] scsi_eh_17 S13320 323 2 0x80000000
[ 312.540983] scsi_tmf_17 I15152 324 2 0x80000000
[ 312.554847] scsi_eh_18 S13320 325 2 0x80000000
[ 312.572062] scsi_tmf_18 I15152 326 2 0x80000000
[ 312.585722] scsi_eh_19 S13320 327 2 0x80000000
[ 312.603012] scsi_tmf_19 I14952 328 2 0x80000000
[ 312.616683] scsi_eh_20 S13320 329 2 0x80000000
[ 312.633915] scsi_tmf_20 I14856 330 2 0x80000000
[ 312.647594] scsi_eh_21 S13624 331 2 0x80000000
[ 312.664791] scsi_tmf_21 I15152 332 2 0x80000000
[ 312.678495] scsi_eh_22 S13320 333 2 0x80000000
[ 312.695697] scsi_tmf_22 I15176 334 2 0x80000000
[ 312.709366] scsi_eh_23 S13656 335 2 0x80000000
[ 312.738358] scsi_tmf_23 I14984 336 2 0x80000000
[ 312.752608] scsi_eh_24 S13320 337 2 0x80000000
[ 312.770582] scsi_tmf_24 I15176 338 2 0x80000000
[ 312.784878] scsi_eh_25 S13624 339 2 0x80000000
[ 312.802234] scsi_tmf_25 I14984 340 2 0x80000000
[ 312.815906] scsi_eh_26 S13624 341 2 0x80000000
[ 312.833209] scsi_tmf_26 I14984 342 2 0x80000000
[ 312.847120] scsi_eh_27 S13656 343 2 0x80000000
[ 312.864431] scsi_tmf_27 I14984 344 2 0x80000000
[ 312.878111] scsi_eh_28 S13656 345 2 0x80000000
[ 312.895298] scsi_tmf_28 I15152 346 2 0x80000000
[ 312.908979] scsi_eh_29 S13656 348 2 0x80000000
[ 312.926273] scsi_tmf_29 I15152 349 2 0x80000000
[ 312.939917] scsi_eh_30 S13656 350 2 0x80000000
[ 312.957305] scsi_tmf_30 I15152 351 2 0x80000000
[ 312.970959] scsi_eh_31 S13008 352 2 0x80000000
[ 312.988336] scsi_tmf_31 I14856 353 2 0x80000000
[ 313.002016] scsi_eh_32 S13624 354 2 0x80000000
[ 313.019231] scsi_tmf_32 I15152 355 2 0x80000000
[ 313.033116] kworker/u256:4 I14616 356 2 0x80000000
[ 313.035122] Workqueue: (null) (events_unbound)
[ 313.048958] kworker/u256:5 I14408 357 2 0x80000000
[ 313.050911] Workqueue: (null) (events_unbound)
[ 313.064605] kworker/u256:6 I14616 358 2 0x80000000
[ 313.066588] Workqueue: (null) (events_unbound)
[ 313.080184] kworker/u256:7 I14392 359 2 0x80000000
[ 313.082139] Workqueue: (null) (events_unbound)
[ 313.095693] kworker/u256:8 I14616 360 2 0x80000000
[ 313.097625] Workqueue: (null) (events_unbound)
[ 313.111206] kworker/u256:9 I14088 362 2 0x80000000
[ 313.113130] Workqueue: (null) (events_unbound)
[ 313.126701] kworker/u256:10 I14440 364 2 0x80000000
[ 313.128630] Workqueue: (null) (events_unbound)
[ 313.142204] kworker/u256:11 I14440 365 2 0x80000000
[ 313.144133] Workqueue: (null) (events_unbound)
[ 313.157836] kworker/u256:12 I14440 366 2 0x80000000
[ 313.159834] Workqueue: (null) (events_unbound)
[ 313.173426] kworker/u256:13 I14440 367 2 0x80000000
[ 313.175360] Workqueue: (null) (events_unbound)
[ 313.188953] kworker/u256:14 I14440 368 2 0x80000000
[ 313.190883] Workqueue: (null) (events_unbound)
[ 313.204529] kworker/u256:15 I14440 369 2 0x80000000
[ 313.206524] Workqueue: (null) (events_unbound)
[ 313.220106] kworker/u256:16 I14440 370 2 0x80000000
[ 313.222040] Workqueue: (null) (events_unbound)
[ 313.235845] kworker/u256:17 I14440 371 2 0x80000000
[ 313.238007] Workqueue: (null) (events_unbound)
[ 313.251879] kworker/u256:18 I14440 372 2 0x80000000
[ 313.253880] Workqueue: (null) (events_unbound)
[ 313.268276] kworker/u256:19 I14440 373 2 0x80000000
[ 313.270312] Workqueue: (null) (events_unbound)
[ 313.284299] kworker/u256:20 I14440 374 2 0x80000000
[ 313.286254] Workqueue: (null) (events_unbound)
[ 313.300548] kworker/u256:21 I14440 375 2 0x80000000
[ 313.302563] Workqueue: (null) (events_unbound)
[ 313.316925] kworker/u256:22 I14440 376 2 0x80000000
[ 313.318857] Workqueue: (null) (events_unbound)
[ 313.333454] kworker/u256:23 I14440 377 2 0x80000000
[ 313.335460] Workqueue: (null) (events_unbound)
[ 313.349943] kworker/u256:24 I14392 378 2 0x80000000
[ 313.351872] Workqueue: (null) (events_unbound)
[ 313.366316] kworker/u256:25 I14392 379 2 0x80000000
[ 313.368369] Workqueue: (null) (events_unbound)
[ 313.382706] kworker/u256:26 I14440 380 2 0x80000000
[ 313.384638] Workqueue: (null) (events_unbound)
[ 313.398913] kworker/u256:27 I14440 381 2 0x80000000
[ 313.400995] Workqueue: (null) (events_unbound)
[ 313.415395] kworker/u256:28 I14440 382 2 0x80000000
[ 313.417325] Workqueue: (null) (events_unbound)
[ 313.431863] kworker/u256:29 I14440 383 2 0x80000000
[ 313.433880] Workqueue: (null) (events_unbound)
[ 313.448121] kworker/u256:30 I12872 384 2 0x80000000
[ 313.450050] Workqueue: (null) (events_unbound)
[ 313.464862] kworker/u256:31 I10848 385 2 0x80000000
[ 313.467082] Workqueue: (null) (flush-8:0)
[ 313.481995] kworker/u256:32 I14440 386 2 0x80000000
[ 313.484013] Workqueue: (null) (events_unbound)
[ 313.498207] kworker/u256:33 I15032 387 2 0x80000000
[ 313.500272] Workqueue: (null) (events_unbound)
[ 313.514300] kworker/1:2 I14728 411 2 0x80000000
[ 313.516350] Workqueue: (null) (cgroup_pidlist_destroy)
[ 313.530409] kworker/6:1H I15144 414 2 0x80000000
[ 313.532422] Workqueue: (null) (kblockd)
[ 313.545957] xfsalloc I15176 419 2 0x80000000
[ 313.559714] xfs_mru_cache I15176 420 2 0x80000000
[ 313.573541] xfs-buf/sda1 I15176 421 2 0x80000000
[ 313.587184] xfs-data/sda1 I15176 422 2 0x80000000
[ 313.600830] xfs-conv/sda1 I15176 423 2 0x80000000
[ 313.614464] xfs-cil/sda1 I15176 424 2 0x80000000
[ 313.628114] xfs-reclaim/sda I15152 425 2 0x80000000
[ 313.641772] xfs-log/sda1 I15176 426 2 0x80000000
[ 313.655372] xfs-eofblocks/s I15176 427 2 0x80000000
[ 313.668954] xfsaild/sda1 S13560 428 2 0x80000000
[ 313.685728] kworker/7:1H I14648 429 2 0x80000000
[ 313.687693] Workqueue: (null) (kblockd)
[ 313.701018] kworker/1:1H I14648 497 2 0x80000000
[ 313.714537] systemd-journal D12600 498 1 0x00000000
[ 313.767803] systemd-udevd S12648 529 1 0x00000000
[ 313.804733] auditd D12808 546 1 0x00000000
[ 313.874023] auditd S13584 547 1 0x00000000
[ 313.910947] kworker/4:1H I15184 552 2 0x80000080
[ 313.912888] Workqueue: (null) (kblockd)
[ 313.927331] polkitd S12536 593 1 0x00000080
[ 313.981730] gmain S14032 604 1 0x00000080
[ 314.041923] gdbus S13760 605 1 0x00000080
[ 314.094085] JS GC Helper S14696 611 1 0x00000080
[ 314.136686] JS Sour~ Thread S14696 616 1 0x00000080
[ 314.180020] polkitd S14200 621 1 0x00000080
[ 314.238165] irqbalance D12904 594 1 0x80000080
[ 314.307023] avahi-daemon S12632 597 1 0x00000080
[ 314.357108] dbus-daemon S12632 598 1 0x00000080
[ 314.390871] avahi-daemon S12888 603 597 0x00000080
[ 314.439229] abrtd S12488 606 1 0x00000080
[ 314.503323] systemd-logind D12904 608 1 0x00000080
[ 314.572804] atd S12728 612 1 0x00000080
[ 314.608670] crond D12536 614 1 0x00000080
[ 314.677690] ksmtuned S13312 619 1 0x00000080
[ 314.714501] firewalld S12456 623 1 0x00000080
[ 314.767120] gmain S14248 756 1 0x00000080
[ 314.824569] NetworkManager S11816 662 1 0x00000080
[ 314.881313] gmain D12544 669 1 0x00000080
[ 314.949419] gdbus S13432 672 1 0x00000080
[ 315.000239] kworker/0:1H I14096 742 2 0x80000080
[ 315.002178] Workqueue: (null) (kblockd)
[ 315.015633] dhclient S12328 759 662 0x00000080
[ 315.082950] kworker/2:1H I14480 768 2 0x80000080
[ 315.084945] Workqueue: (null) (xfs-log/sda1)
[ 315.098501] tuned S12552 949 1 0x00000080
[ 315.165944] gmain S14248 995 1 0x00000080
[ 315.224133] tuned D12328 996 1 0x80000080
[ 315.292809] tuned S14408 997 1 0x00000080
[ 315.330274] tuned S14248 1011 1 0x00000080
[ 315.389366] smbd S11288 951 1 0x00000080
[ 315.427197] sshd S12552 952 1 0x00000080
[ 315.509092] rsyslogd S12696 954 1 0x00000080
[ 315.578028] in:imjournal D12048 965 1 0x80000080
[ 315.645481] rs:main Q:Reg S12792 966 1 0x00000080
[ 315.681641] sendmail D13176 967 1 0x00000080
[ 315.751526] kworker/0:3 I13376 977 2 0x80000080
[ 315.753526] Workqueue: (null) (ata_sff)
[ 315.766860] agetty S12904 989 1 0x00000080
[ 315.810543] login S12488 990 1 0x00000080
[ 315.849297] sendmail S14256 991 1 0x00000080
[ 315.877525] smbd-notifyd D12792 1012 951 0x00000080
[ 315.947463] cleanupd D13144 1013 951 0x00000080
[ 316.016683] lpqd S12888 1016 951 0x00000080
[ 316.054304] bash S12656 1019 990 0x00000080
[ 316.092765] sleep D12808 1614 619 0x00000080
[ 429.965904] systemd D12240 1 0 0x00000000
[ 430.045240] kthreadd S14024 2 0 0x80000000
[ 430.055553] rcu_gp I15176 3 2 0x80000000
[ 430.069575] rcu_par_gp I15176 4 2 0x80000000
[ 430.083584] kworker/0:0 R running task 13504 5 2 0x80000000
[ 430.085990] Workqueue: events_freezable_power_ disk_events_workfn
[ 430.210920] kworker/0:0H I14648 6 2 0x80000000
[ 430.212997] Workqueue: (null) (xfs-log/sda1)
[ 430.227747] mm_percpu_wq I15176 8 2 0x80000000
[ 430.242131] ksoftirqd/0 S14664 9 2 0x80000000
[ 430.257645] rcu_sched I14360 10 2 0x80000000
[ 430.271300] rcu_bh I15192 11 2 0x80000000
[ 430.288804] migration/0 S14664 12 2 0x80000000
[ 430.302736] cpuhp/0 S13920 14 2 0x80000000
[ 430.316785] cpuhp/1 P13992 15 2 0x80000000
[ 430.332349] migration/1 P14664 16 2 0x80000000
[ 430.347965] ksoftirqd/1 P14656 17 2 0x80000000
[ 430.363616] kworker/1:0 I13808 18 2 0x80000000
[ 430.365571] Workqueue: (null) (events)
[ 430.379215] kworker/1:0H I14648 19 2 0x80000000
[ 430.381183] Workqueue: (null) (kblockd)
[ 430.394637] cpuhp/2 P13992 20 2 0x80000000
[ 430.410289] migration/2 P14664 21 2 0x80000000
[ 430.425871] ksoftirqd/2 P14664 22 2 0x80000000
[ 430.441401] kworker/2:0H I14480 24 2 0x80000000
[ 430.443354] Workqueue: (null) (xfs-log/sda1)
[ 430.456923] cpuhp/3 P14056 25 2 0x80000000
[ 430.472692] migration/3 P14664 26 2 0x80000000
[ 430.488439] ksoftirqd/3 P14600 27 2 0x80000000
[ 430.504382] kworker/3:0H I15192 29 2 0x80000000
[ 430.518385] cpuhp/4 P13696 30 2 0x80000000
[ 430.534771] migration/4 P14664 31 2 0x80000000
[ 430.550345] ksoftirqd/4 P14664 32 2 0x80000000
[ 430.565951] kworker/4:0H I14808 34 2 0x80000000
[ 430.567894] Workqueue: (null) (kblockd)
[ 430.581313] cpuhp/5 P13960 35 2 0x80000000
[ 430.596904] migration/5 P14664 36 2 0x80000000
[ 430.612501] ksoftirqd/5 P14664 37 2 0x80000000
[ 430.628142] kworker/5:0H I15184 39 2 0x80000000
[ 430.641797] cpuhp/6 P14024 40 2 0x80000000
[ 430.657356] migration/6 P14664 41 2 0x80000000
[ 430.672944] ksoftirqd/6 P14600 42 2 0x80000000
[ 430.688512] kworker/6:0H I14616 44 2 0x80000000
[ 430.690475] Workqueue: (null) (kblockd)
[ 430.704778] cpuhp/7 P13992 45 2 0x80000000
[ 430.721362] migration/7 P14664 46 2 0x80000000
[ 430.737498] ksoftirqd/7 P14856 47 2 0x80000000
[ 430.753602] kworker/7:0H I14808 49 2 0x80000000
[ 430.755618] Workqueue: (null) (xfs-log/sda1)
[ 430.769558] kdevtmpfs S13552 50 2 0x80000000
[ 430.784541] netns I15152 51 2 0x80000000
[ 430.798092] kauditd S14640 53 2 0x80000000
[ 430.816061] khungtaskd S14368 54 2 0x80000000
[ 430.832568] oom_reaper S14464 55 2 0x80000000
[ 430.847090] writeback I15152 56 2 0x80000000
[ 430.860445] kcompactd0 S14856 57 2 0x80000000
[ 430.875004] ksmd S15032 58 2 0x80000000
[ 430.894691] khugepaged D13832 59 2 0x80000000
[ 430.941897] crypto I15192 60 2 0x80000000
[ 430.955462] kintegrityd I15152 61 2 0x80000000
[ 430.970103] kblockd I15192 62 2 0x80000000
[ 430.985679] kworker/3:1 I14264 63 2 0x80000000
[ 430.987830] Workqueue: (null) (events)
[ 431.006463] kworker/5:1 I13568 64 2 0x80000000
[ 431.008721] Workqueue: (null) (events)
[ 431.022691] kworker/0:2 I13104 65 2 0x80000000
[ 431.024683] Workqueue: (null) (cgroup_pidlist_destroy)
[ 431.039039] md I15152 66 2 0x80000000
[ 431.052855] edac-poller I15192 67 2 0x80000000
[ 431.066622] devfreq_wq I15152 68 2 0x80000000
[ 431.082179] watchdogd S15192 69 2 0x80000000
[ 431.099273] kworker/2:1 I13848 70 2 0x80000000
[ 431.101428] Workqueue: (null) (cgroup_pidlist_destroy)
[ 431.115249] kswapd0 S11528 71 2 0x80000000
[ 431.130196] kworker/4:1 I13976 82 2 0x80000000
[ 431.132110] Workqueue: (null) (events)
[ 431.145382] kthrotld I14712 88 2 0x80000000
[ 431.159018] kworker/6:1 I14280 89 2 0x80000000
[ 431.160998] Workqueue: (null) (events)
[ 431.174300] kworker/7:1 I13976 90 2 0x80000000
[ 431.176275] Workqueue: (null) (events_power_efficient)
[ 431.190169] acpi_thermal_pm I14856 91 2 0x80000000
[ 431.204078] kmpath_rdacd I15176 93 2 0x80000000
[ 431.218355] kaluad I14712 94 2 0x80000000
[ 431.232512] nvme-wq I14712 95 2 0x80000000
[ 431.246066] nvme-reset-wq I14712 96 2 0x80000000
[ 431.259655] nvme-delete-wq I15176 97 2 0x80000000
[ 431.273200] ipv6_addrconf I15176 100 2 0x80000000
[ 431.287563] kworker/5:2 I14728 134 2 0x80000000
[ 431.289707] Workqueue: (null) (events)
[ 431.303527] kworker/2:2 I13952 156 2 0x80000000
[ 431.305447] Workqueue: (null) (events)
[ 431.318965] kworker/6:2 I14264 158 2 0x80000000
[ 431.320882] Workqueue: (null) (events)
[ 431.334236] kworker/4:2 I14648 200 2 0x80000000
[ 431.336153] Workqueue: (null) (cgroup_pidlist_destroy)
[ 431.349824] kworker/3:2 I14728 251 2 0x80000000
[ 431.351745] Workqueue: (null) (cgroup_pidlist_destroy)
[ 431.365438] kworker/7:2 I13520 282 2 0x80000000
[ 431.367360] Workqueue: (null) (events)
[ 431.383306] ata_sff I15152 284 2 0x80000000
[ 431.397949] scsi_eh_0 S14504 285 2 0x80000000
[ 431.418707] scsi_tmf_0 I14952 286 2 0x80000000
[ 431.432417] scsi_eh_1 S13560 287 2 0x80000000
[ 431.449499] scsi_tmf_1 I14952 288 2 0x80000000
[ 431.463159] mpt_poll_0 I15152 289 2 0x80000000
[ 431.477194] mpt/0 I14952 290 2 0x80000000
[ 431.491369] scsi_eh_2 S13320 291 2 0x80000000
[ 431.509148] scsi_tmf_2 I15152 292 2 0x80000000
[ 431.523419] scsi_eh_3 S13656 293 2 0x80000000
[ 431.540836] scsi_tmf_3 I15152 294 2 0x80000000
[ 431.554526] scsi_eh_4 S13656 295 2 0x80000000
[ 431.573951] scsi_tmf_4 I15176 296 2 0x80000000
[ 431.590636] scsi_eh_5 S13320 297 2 0x80000000
[ 431.610073] scsi_tmf_5 I15152 298 2 0x80000000
[ 431.625309] scsi_eh_6 S13320 299 2 0x80000000
[ 431.645255] scsi_tmf_6 I15152 300 2 0x80000000
[ 431.660850] ttm_swap I15176 301 2 0x80000000
[ 431.676590] scsi_eh_7 S13320 302 2 0x80000000
[ 431.696192] scsi_tmf_7 I15064 303 2 0x80000000
[ 431.711927] scsi_eh_8 S13320 304 2 0x80000000
[ 431.731901] scsi_tmf_8 I14856 305 2 0x80000000
[ 431.747401] scsi_eh_9 S13656 306 2 0x80000000
[ 431.767158] scsi_tmf_9 I15152 307 2 0x80000000
[ 431.782141] irq/16-vmwgfx S14784 308 2 0x80000000
[ 431.801432] scsi_eh_10 S13320 309 2 0x80000000
[ 431.819869] scsi_tmf_10 I15152 310 2 0x80000000
[ 431.834047] scsi_eh_11 S13320 311 2 0x80000000
[ 431.851641] scsi_tmf_11 I15176 312 2 0x80000000
[ 431.865316] scsi_eh_12 S13656 313 2 0x80000000
[ 431.882579] scsi_tmf_12 I15152 314 2 0x80000000
[ 431.896275] scsi_eh_13 S13656 315 2 0x80000000
[ 431.913545] scsi_tmf_13 I15032 316 2 0x80000000
[ 431.927339] scsi_eh_14 S13624 317 2 0x80000000
[ 431.944787] scsi_tmf_14 I15176 318 2 0x80000000
[ 431.958953] scsi_eh_15 S15192 319 2 0x80000000
[ 431.977842] scsi_tmf_15 I15176 320 2 0x80000000
[ 431.991927] scsi_eh_16 S13656 321 2 0x80000000
[ 432.009353] scsi_tmf_16 I15032 322 2 0x80000000
[ 432.023012] scsi_eh_17 S13320 323 2 0x80000000
[ 432.040219] scsi_tmf_17 I15152 324 2 0x80000000
[ 432.053920] scsi_eh_18 S13320 325 2 0x80000000
[ 432.071121] scsi_tmf_18 I15152 326 2 0x80000000
[ 432.084940] scsi_eh_19 S13320 327 2 0x80000000
[ 432.102554] scsi_tmf_19 I14952 328 2 0x80000000
[ 432.116239] scsi_eh_20 S13320 329 2 0x80000000
[ 432.133434] scsi_tmf_20 I14856 330 2 0x80000000
[ 432.147092] scsi_eh_21 S13624 331 2 0x80000000
[ 432.164292] scsi_tmf_21 I15152 332 2 0x80000000
[ 432.179198] scsi_eh_22 S13320 333 2 0x80000000
[ 432.197105] scsi_tmf_22 I15176 334 2 0x80000000
[ 432.211388] scsi_eh_23 S13656 335 2 0x80000000
[ 432.228948] scsi_tmf_23 I14984 336 2 0x80000000
[ 432.242745] scsi_eh_24 S13320 337 2 0x80000000
[ 432.260114] scsi_tmf_24 I15176 338 2 0x80000000
[ 432.273909] scsi_eh_25 S13624 339 2 0x80000000
[ 432.292257] scsi_tmf_25 I14984 340 2 0x80000000
[ 432.306667] scsi_eh_26 S13624 341 2 0x80000000
[ 432.324014] scsi_tmf_26 I14984 342 2 0x80000000
[ 432.337927] scsi_eh_27 S13656 343 2 0x80000000
[ 432.355175] scsi_tmf_27 I14984 344 2 0x80000000
[ 432.368970] scsi_eh_28 S13656 345 2 0x80000000
[ 432.386277] scsi_tmf_28 I15152 346 2 0x80000000
[ 432.400001] scsi_eh_29 S13656 348 2 0x80000000
[ 432.417628] scsi_tmf_29 I15152 349 2 0x80000000
[ 432.431300] scsi_eh_30 S13656 350 2 0x80000000
[ 432.448517] scsi_tmf_30 I15152 351 2 0x80000000
[ 432.462367] scsi_eh_31 S13008 352 2 0x80000000
[ 432.480180] scsi_tmf_31 I14856 353 2 0x80000000
[ 432.494334] scsi_eh_32 S13624 354 2 0x80000000
[ 432.512183] scsi_tmf_32 I15152 355 2 0x80000000
[ 432.526539] kworker/u256:30 I12872 384 2 0x80000000
[ 432.528477] Workqueue: (null) (events_unbound)
[ 432.542276] kworker/u256:31 I10848 385 2 0x80000000
[ 432.544216] Workqueue: (null) (flush-8:0)
[ 432.557869] kworker/1:2 I14728 411 2 0x80000000
[ 432.559806] Workqueue: (null) (cgroup_pidlist_destroy)
[ 432.573637] kworker/6:1H I15144 414 2 0x80000000
[ 432.575578] Workqueue: (null) (kblockd)
[ 432.589008] xfsalloc I15176 419 2 0x80000000
[ 432.602765] xfs_mru_cache I15176 420 2 0x80000000
[ 432.616433] xfs-buf/sda1 I15176 421 2 0x80000000
[ 432.630080] xfs-data/sda1 I15176 422 2 0x80000000
[ 432.643719] xfs-conv/sda1 I15176 423 2 0x80000000
[ 432.657334] xfs-cil/sda1 I15176 424 2 0x80000000
[ 432.670935] xfs-reclaim/sda I15152 425 2 0x80000000
[ 432.684559] xfs-log/sda1 I15176 426 2 0x80000000
[ 432.698196] xfs-eofblocks/s I15176 427 2 0x80000000
[ 432.712330] xfsaild/sda1 S13560 428 2 0x80000000
[ 432.729342] kworker/7:1H I14648 429 2 0x80000000
[ 432.731277] Workqueue: (null) (kblockd)
[ 432.745674] kworker/1:1H I14648 497 2 0x80000000
[ 432.759743] systemd-journal D12600 498 1 0x00000000
[ 432.815707] systemd-udevd S12648 529 1 0x00000000
[ 432.854484] auditd D12808 546 1 0x00000000
[ 432.928413] auditd S13584 547 1 0x00000000
[ 432.967315] kworker/4:1H I15184 552 2 0x80000080
[ 432.969349] Workqueue: (null) (kblockd)
[ 432.983507] polkitd S12536 593 1 0x00000080
[ 433.040141] gmain S14032 604 1 0x00000080
[ 433.103106] gdbus S13760 605 1 0x00000080
[ 433.154604] JS GC Helper S14696 611 1 0x00000080
[ 433.196161] JS Sour~ Thread S14696 616 1 0x00000080
[ 433.240104] polkitd S14200 621 1 0x00000080
[ 433.299587] irqbalance D12904 594 1 0x80000080
[ 433.367588] avahi-daemon S12632 597 1 0x00000080
[ 433.417623] dbus-daemon S12632 598 1 0x00000080
[ 433.451459] avahi-daemon S12888 603 597 0x00000080
[ 433.499393] abrtd S12488 606 1 0x00000080
[ 433.562968] systemd-logind D12904 608 1 0x00000080
[ 433.632571] atd S12728 612 1 0x00000080
[ 433.668235] crond D12536 614 1 0x00000080
[ 433.737767] ksmtuned S13312 619 1 0x00000080
[ 433.775017] firewalld S12456 623 1 0x00000080
[ 433.828076] gmain S14248 756 1 0x00000080
[ 433.885072] NetworkManager D11816 662 1 0x00000080
[ 433.954132] gmain D12544 669 1 0x00000080
[ 434.023109] gdbus S13432 672 1 0x00000080
[ 434.073500] kworker/0:1H I14096 742 2 0x80000080
[ 434.075444] Workqueue: (null) (kblockd)
[ 434.088969] dhclient S12328 759 662 0x00000080
[ 434.157035] kworker/2:1H I14480 768 2 0x80000080
[ 434.159035] Workqueue: (null) (xfs-log/sda1)
[ 434.172628] tuned S12552 949 1 0x00000080
[ 434.240578] gmain S14248 995 1 0x00000080
[ 434.300681] tuned D12328 996 1 0x80000080
[ 434.369863] tuned S14408 997 1 0x00000080
[ 434.407096] tuned S14248 1011 1 0x00000080
[ 434.464385] smbd S11288 951 1 0x00000080
[ 434.502579] sshd S12552 952 1 0x00000080
[ 434.574892] rsyslogd S12696 954 1 0x00000080
[ 434.644123] in:imjournal D12048 965 1 0x80000080
[ 434.711494] rs:main Q:Reg S12792 966 1 0x00000080
[ 434.746928] sendmail D13176 967 1 0x00000080
[ 434.816872] kworker/0:3 I13376 977 2 0x80000080
[ 434.818821] Workqueue: (null) (ata_sff)
[ 434.832423] agetty S12904 989 1 0x00000080
[ 434.877203] login S12488 990 1 0x00000080
[ 434.917384] sendmail S14256 991 1 0x00000080
[ 434.947588] smbd-notifyd D12792 1012 951 0x00000080
[ 435.021389] cleanupd D13144 1013 951 0x00000080
[ 435.094050] lpqd S12888 1016 951 0x00000080
[ 435.133174] bash S12656 1019 990 0x00000080
[ 435.172224] sleep D12808 1614 619 0x00000080
>>>
>>> I do not mind this change per se but I am not happy about _your_ changelog.
>>> It doesn't explain the underlying problem IMHO. Having a natural and
>>> unconditional scheduling point in should_reclaim_retry is a reasonable
>>> thing. But how the hack it relates to the livelock you are seeing. So
>>> namely the changelog should explain
>>> 1) why nobody is able to make forward progress during direct reclaim
>>
>> Because GFP_NOIO allocation from one workqueue prevented WQ_MEM_RECLAIM
>> workqueues from starting, for it did not call schedule_timeout_*() because
>> mutex_trylock(&oom_lock) did not fail because nobody else could call
>> __alloc_pages_may_oom().
>
> Why hasn't the rescuer helped here?
Rescuer does not work without schedule_timeout_*().
>
>>> 2) why nobody is able to trigger oom killer as the last resort
>>
>> Because only one !__GFP_FS allocating thread which did not get stuck at
>> direct reclaim was able to call __alloc_pages_may_oom().
>
> All the remaining allocations got stuck waiting for completion which
> depends on !WQ_MEM_RECLAIM workers right?
>
A !WQ_MEM_RECLAIM worker did not call schedule_timeout_*() is preventing
anyone who is waiting for WQ_MEM_RECLAIM workers from making progress.
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