Tetsuo Handa wrote:
> I haven't succeeded reproducing mm_percpu_wq with this patch applied.
OK. I succeeded reproducing mm_percpu_wq with this patch applied.
I confirmed that drain_local_pages_wq is indeed stalling for minutes
when all allocations got stuck (i.e. CPU usage is nearly 0%).
Why WQ_MEM_RECLAIM workqueue does not process pending works?
mm_percpu_wq = alloc_workqueue("mm_percpu_wq", WQ_MEM_RECLAIM, 0);
Aren't we missing yet another basic something in addition to
http://lkml.kernel.org/r/201703031948.CHJ81278.VOHSFFFOOLJQMt@xxxxxxxxxxxxxxxxxxx ?
Complete log is at http://I-love.SAKURA.ne.jp/tmp/serial-20170707.txt.xz .
----------
[ 444.140700] mm_percpu_wq S14768 6 2 0x00000000
[ 444.142793] Call Trace:
[ 444.143893] __schedule+0x23f/0x5d0
[ 444.145346] schedule+0x31/0x80
[ 444.146656] rescuer_thread+0x343/0x390
[ 444.148211] kthread+0xff/0x140
[ 444.149555] ? worker_thread+0x410/0x410
[ 444.151101] ? kthread_create_on_node+0x60/0x60
[ 444.152973] ret_from_fork+0x25/0x30
(...snipped...)
[ 465.086921] c.out D12296 4561 4382 0x00000080
[ 465.089063] Call Trace:
[ 465.090251] __schedule+0x23f/0x5d0
[ 465.091745] ? update_load_avg+0x406/0x4f0
[ 465.093381] schedule+0x31/0x80
[ 465.094769] schedule_timeout+0x1c1/0x290
[ 465.096434] ? pick_next_task_fair+0x431/0x520
[ 465.098210] ? __switch_to+0x23d/0x3b0
[ 465.099779] wait_for_completion+0xaf/0x140
[ 465.101482] ? wait_for_completion+0xaf/0x140
[ 465.103206] ? wake_up_q+0x70/0x70
[ 465.104764] flush_work+0x145/0x210
[ 465.106295] ? worker_detach_from_pool+0xa0/0xa0
[ 465.108096] drain_all_pages+0x1e5/0x250
[ 465.109715] __alloc_pages_slowpath+0x498/0xd50
[ 465.111513] __alloc_pages_nodemask+0x20c/0x250
[ 465.113285] alloc_pages_current+0x65/0xd0
[ 465.114982] new_slab+0x472/0x600
[ 465.116521] ___slab_alloc+0x41b/0x590
[ 465.118160] ? kmem_alloc+0x8a/0x110 [xfs]
[ 465.119965] ? kmem_alloc+0x8a/0x110 [xfs]
[ 465.121672] __slab_alloc+0x1b/0x30
[ 465.123125] ? __save_stack_trace+0x70/0xf0
[ 465.124839] ? __slab_alloc+0x1b/0x30
[ 465.126388] __kmalloc+0x17e/0x200
[ 465.127820] kmem_alloc+0x8a/0x110 [xfs]
[ 465.129677] xfs_iext_inline_to_direct+0x1f/0x80 [xfs]
[ 465.131668] xfs_iext_realloc_direct+0xc6/0x140 [xfs]
[ 465.133591] xfs_iext_add+0x196/0x2e0 [xfs]
[ 465.135294] xfs_iext_insert+0x37/0xa0 [xfs]
[ 465.137021] xfs_bmap_add_extent_hole_delay+0xff/0x510 [xfs]
[ 465.139216] ? free_debug_processing+0x251/0x3a0
[ 465.141015] ? xfs_mod_fdblocks+0xa1/0x1a0 [xfs]
[ 465.142863] xfs_bmapi_reserve_delalloc+0x282/0x340 [xfs]
[ 465.145080] xfs_file_iomap_begin+0x574/0x750 [xfs]
[ 465.146980] ? iomap_write_begin.constprop.16+0x120/0x120
[ 465.149042] iomap_apply+0x55/0x110
[ 465.150482] ? iomap_write_begin.constprop.16+0x120/0x120
[ 465.152568] iomap_file_buffered_write+0x69/0x90
[ 465.154466] ? iomap_write_begin.constprop.16+0x120/0x120
[ 465.156604] xfs_file_buffered_aio_write+0xb7/0x200 [xfs]
[ 465.158668] xfs_file_write_iter+0x8d/0x130 [xfs]
[ 465.160526] __vfs_write+0xef/0x150
[ 465.161972] vfs_write+0xb0/0x190
[ 465.163361] SyS_write+0x50/0xc0
[ 465.164762] do_syscall_64+0x62/0x140
[ 465.166290] entry_SYSCALL64_slow_path+0x25/0x25
(...snipped...)
[ 541.104151] Showing busy workqueues and worker pools:
[ 541.106286] workqueue events: flags=0x0
[ 541.107928] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=4/256
[ 541.110294] pending: console_callback{132766}, vmw_fb_dirty_flush [vmwgfx]{110231}, sysrq_reinject_alt_sysrq{109775}, push_to_pool{97580}
[ 541.114924] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=2/256
[ 541.117355] pending: e1000_watchdog [e1000]{143326}, check_corruption{101853}
[ 541.120297] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 541.122756] pending: vmpressure_work_fn{144398}, e1000_watchdog [e1000]{142948}
[ 541.125759] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 541.128121] pending: vmstat_shepherd{143401}
[ 541.129990] workqueue events_long: flags=0x0
[ 541.131838] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.134258] pending: gc_worker [nf_conntrack]{144295}
[ 541.136561] workqueue events_freezable: flags=0x4
[ 541.138588] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 541.141037] pending: vmballoon_work [vmw_balloon]{143414}
[ 541.143428] workqueue events_power_efficient: flags=0x80
[ 541.145661] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.148083] pending: neigh_periodic_work{134652}
[ 541.150237] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 541.152722] pending: fb_flashcursor{144370}, do_cache_clean{137210}
[ 541.155409] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 541.157936] pending: neigh_periodic_work{130557}
[ 541.160062] workqueue events_freezable_power_: flags=0x84
[ 541.162356] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.164910] pending: disk_events_workfn{143950}
[ 541.167097] workqueue mm_percpu_wq: flags=0x8
[ 541.169071] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256
[ 541.171570] pending: vmstat_update{143444}
[ 541.173543] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.176035] pending: vmstat_update{143441}
[ 541.177987] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 541.180506] pending: drain_local_pages_wq{144380} BAR(4561){144380}
[ 541.183292] workqueue writeback: flags=0x4e
[ 541.185241] pwq 128: cpus=0-63 flags=0x4 nice=0 active=1/256
[ 541.187726] in-flight: 354:wb_workfn{118308}
[ 541.190206] workqueue ipv6_addrconf: flags=0x40008
[ 541.192376] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 MAYDAY
[ 541.195062] pending: addrconf_verify_work{28203}
[ 541.197343] workqueue mpt_poll_0: flags=0x8
[ 541.199364] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.202015] pending: mpt_fault_reset_work [mptbase]{143283}
[ 541.204580] workqueue xfs-buf/sda1: flags=0xc
[ 541.206656] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/1
[ 541.209152] pending: xfs_buf_ioend_work [xfs]{144349}
[ 541.211588] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/1
[ 541.214141] pending: xfs_buf_ioend_work [xfs]{144317}
[ 541.216590] delayed: xfs_buf_ioend_work [xfs]{144273}, xfs_buf_ioend_work [xfs]{144267}, xfs_buf_ioend_work [xfs]{144267}
[ 541.220929] workqueue xfs-data/sda1: flags=0xc
[ 541.223026] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=22/256
[ 541.225602] in-flight: 3221:xfs_end_io [xfs]{144401}, 3212:xfs_end_io [xfs]{144518}, 29:xfs_end_io [xfs]{144560}, 3230:xfs_end_io [xfs]{144531}, 3229:xfs_end_io [xfs]{144459}, 50:xfs_end_io [xfs]{144459}, 3223:xfs_end_io [xfs]{144405}, 165:xfs_end_io [xfs]{144413}, 3215:xfs_end_io [xfs]{144407}
[ 541.235455] pending: xfs_end_io [xfs]{144374}, xfs_end_io [xfs]{144370}, xfs_end_io [xfs]{144370}, xfs_end_io [xfs]{144362}, xfs_end_io [xfs]{144340}, xfs_end_io [xfs]{144338}, xfs_end_io [xfs]{144333}, xfs_end_io [xfs]{144326}, xfs_end_io [xfs]{144326}, xfs_end_io [xfs]{144313}, xfs_end_io [xfs]{144311}, xfs_end_io [xfs]{144311}, xfs_end_io [xfs]{144309}
[ 541.247828] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=27/256 MAYDAY
[ 541.250691] in-flight: 3225:xfs_end_io [xfs]{144613}, 236:xfs_end_io [xfs]{144527}, 23:xfs_end_io [xfs]{144515}, 3228:xfs_end_io [xfs]{144515}, 4380:xfs_end_io [xfs]{144623}, 3214:xfs_end_io [xfs]{144604}, 3220:xfs_end_io [xfs]{144576}, 3227:xfs_end_io [xfs]{144597}
[ 541.259961] pending: xfs_end_io [xfs]{144524}, xfs_end_io [xfs]{144514}, xfs_end_io [xfs]{144493}, xfs_end_io [xfs]{144493}, xfs_end_io [xfs]{144493}, xfs_end_io [xfs]{144493}, xfs_end_io [xfs]{144493}, xfs_end_io [xfs]{144481}, xfs_end_io [xfs]{144475}, xfs_end_io [xfs]{144461}, xfs_end_io [xfs]{144461}, xfs_end_io [xfs]{144457}, xfs_end_io [xfs]{144447}, xfs_end_io [xfs]{144426}, xfs_end_io [xfs]{144423}, xfs_end_io [xfs]{144416}, xfs_end_io [xfs]{144405}, xfs_end_io [xfs]{144386}, xfs_end_io [xfs]{144379}
[ 541.278219] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=24/256 MAYDAY
[ 541.281279] in-flight: 375(RESCUER):xfs_end_io [xfs]{144555}, 42:xfs_end_io [xfs]{144639}, 3222:xfs_end_io [xfs]{144647}, 17:xfs_end_io [xfs]{144556}, 65:xfs_end_io [xfs]{144602}, 122:xfs_end_io [xfs]{144591}
[ 541.289186] pending: xfs_end_io [xfs]{144549}, xfs_end_io [xfs]{144516}, xfs_end_io [xfs]{144475}, xfs_end_io [xfs]{144450}, xfs_end_io [xfs]{144443}, xfs_end_io [xfs]{144433}, xfs_end_io [xfs]{144432}, xfs_end_io [xfs]{144429}, xfs_end_io [xfs]{144424}, xfs_end_io [xfs]{144415}, xfs_end_io [xfs]{144413}, xfs_end_io [xfs]{144409}, xfs_end_io [xfs]{144394}, xfs_end_io [xfs]{144389}, xfs_end_io [xfs]{144379}, xfs_end_io [xfs]{144378}, xfs_end_io [xfs]{144376}, xfs_end_io [xfs]{144373}
[ 541.307292] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256
[ 541.310168] in-flight: 3218:xfs_end_io [xfs]{144631}, 3216:xfs_end_io [xfs]{144628}, 3:xfs_end_io [xfs]{144586}, 33:xfs_end_io [xfs]{144544}, 101:xfs_end_io [xfs]{144522}, 4381:xfs_end_io [xfs]{144657}, 3219:xfs_end_io [xfs]{144544}
[ 541.319071] pending: xfs_end_io [xfs]{144516}, xfs_end_io [xfs]{144508}, xfs_end_io [xfs]{144500}, xfs_end_io [xfs]{144424}, xfs_end_io [xfs]{144393}, xfs_end_io [xfs]{144392}
[ 541.326402] workqueue xfs-reclaim/sda1: flags=0xc
[ 541.329042] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.332094] pending: xfs_reclaim_worker [xfs]{143541}
[ 541.334909] workqueue xfs-sync/sda1: flags=0x4
[ 541.337455] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 541.340467] pending: xfs_log_worker [xfs]{137404}
[ 541.343145] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=144s workers=8 manager: 3224
[ 541.346676] pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=144s workers=6 manager: 3213
[ 541.350074] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=144s workers=9 manager: 47
[ 541.353556] pool 6: cpus=3 node=0 flags=0x0 nice=0 hung=144s workers=10 manager: 3217
[ 541.357194] pool 128: cpus=0-63 flags=0x4 nice=0 hung=118s workers=3 idle: 355 356
[ 574.951090] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 178s!
[ 574.965692] BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 178s!
[ 574.978062] BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 178s!
[ 574.990564] BUG: workqueue lockup - pool cpus=3 node=0 flags=0x0 nice=0 stuck for 33s!
[ 574.995614] Showing busy workqueues and worker pools:
[ 574.999262] workqueue events: flags=0x0
[ 575.002637] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=4/256
[ 575.006859] pending: console_callback{166657}, vmw_fb_dirty_flush [vmwgfx]{144122}, sysrq_reinject_alt_sysrq{143666}, push_to_pool{131471}
[ 575.013957] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=2/256
[ 575.018004] pending: e1000_watchdog [e1000]{177225}, check_corruption{135752}
[ 575.022236] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 575.025090] pending: vmpressure_work_fn{178298}, e1000_watchdog [e1000]{176848}
[ 575.028448] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 575.031276] pending: vmstat_shepherd{177304}
[ 575.033687] workqueue events_long: flags=0x0
[ 575.035960] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 575.038732] pending: gc_worker [nf_conntrack]{178192}
[ 575.041299] workqueue events_freezable: flags=0x4
[ 575.043747] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 575.046476] pending: vmballoon_work [vmw_balloon]{177314}
[ 575.049136] workqueue events_power_efficient: flags=0x80
[ 575.051623] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256
[ 575.054292] pending: check_lifetime{33686}
[ 575.056478] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 575.059110] pending: neigh_periodic_work{168560}
[ 575.061404] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 575.064070] pending: fb_flashcursor{178280}, do_cache_clean{171120}
[ 575.066866] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 575.069442] pending: neigh_periodic_work{164462}
[ 575.071709] workqueue events_freezable_power_: flags=0x84
[ 575.074100] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 575.076610] pending: disk_events_workfn{177856}
[ 575.078806] workqueue mm_percpu_wq: flags=0x8
[ 575.080807] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 575.083278] pending: vmstat_update{177346}
[ 575.085235] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 575.087654] pending: drain_local_pages_wq{178281} BAR(4561){178281}
[ 575.090339] workqueue writeback: flags=0x4e
[ 575.092216] pwq 128: cpus=0-63 flags=0x4 nice=0 active=1/256
[ 575.094624] in-flight: 354:wb_workfn{152208}
[ 575.096978] workqueue mpt_poll_0: flags=0x8
[ 575.098911] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 575.101330] pending: mpt_fault_reset_work [mptbase]{177177}
[ 575.104022] workqueue xfs-buf/sda1: flags=0xc
[ 575.105933] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/1
[ 575.108326] pending: xfs_buf_ioend_work [xfs]{178206}
[ 575.110552] delayed: xfs_buf_ioend_work [xfs]{178160}, xfs_buf_ioend_work [xfs]{178154}, xfs_buf_ioend_work [xfs]{178154}
[ 575.114766] workqueue xfs-data/sda1: flags=0xc
[ 575.116756] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=22/256 MAYDAY
[ 575.119431] in-flight: 3221:xfs_end_io [xfs]{178291}, 3212:xfs_end_io [xfs]{178408}, 29:xfs_end_io [xfs]{178450}, 3230:xfs_end_io [xfs]{178421}, 3229:xfs_end_io [xfs]{178349}, 50:xfs_end_io [xfs]{178349}, 3223:xfs_end_io [xfs]{178295}, 165:xfs_end_io [xfs]{178302}, 3215:xfs_end_io [xfs]{178296}
[ 575.128992] pending: xfs_end_io [xfs]{178267}, xfs_end_io [xfs]{178263}, xfs_end_io [xfs]{178263}, xfs_end_io [xfs]{178255}, xfs_end_io [xfs]{178233}, xfs_end_io [xfs]{178231}, xfs_end_io [xfs]{178226}, xfs_end_io [xfs]{178219}, xfs_end_io [xfs]{178219}, xfs_end_io [xfs]{178206}, xfs_end_io [xfs]{178204}, xfs_end_io [xfs]{178204}, xfs_end_io [xfs]{178202}
[ 575.141004] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=27/256 MAYDAY
[ 575.143800] in-flight: 3225:xfs_end_io [xfs]{178498}, 236:xfs_end_io [xfs]{178412}, 23:xfs_end_io [xfs]{178400}, 3228:xfs_end_io [xfs]{178400}, 4380:xfs_end_io [xfs]{178508}, 3214:xfs_end_io [xfs]{178489}, 3220:xfs_end_io [xfs]{178461}, 3227:xfs_end_io [xfs]{178482}
[ 575.152624] pending: xfs_end_io [xfs]{178415}, xfs_end_io [xfs]{178405}, xfs_end_io [xfs]{178384}, xfs_end_io [xfs]{178384}, xfs_end_io [xfs]{178384}, xfs_end_io [xfs]{178384}, xfs_end_io [xfs]{178384}, xfs_end_io [xfs]{178372}, xfs_end_io [xfs]{178366}, xfs_end_io [xfs]{178352}, xfs_end_io [xfs]{178352}, xfs_end_io [xfs]{178348}, xfs_end_io [xfs]{178338}, xfs_end_io [xfs]{178317}, xfs_end_io [xfs]{178314}, xfs_end_io [xfs]{178307}, xfs_end_io [xfs]{178296}, xfs_end_io [xfs]{178277}, xfs_end_io [xfs]{178270}
[ 575.169750] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=24/256 MAYDAY
[ 575.172622] in-flight: 375(RESCUER):xfs_end_io [xfs]{178442}, 42:xfs_end_io [xfs]{178526}, 3222:xfs_end_io [xfs]{178534}, 17:xfs_end_io [xfs]{178443}, 65:xfs_end_io [xfs]{178489}, 122:xfs_end_io [xfs]{178478}
[ 575.180109] pending: xfs_end_io [xfs]{178436}, xfs_end_io [xfs]{178403}, xfs_end_io [xfs]{178362}, xfs_end_io [xfs]{178337}, xfs_end_io [xfs]{178330}, xfs_end_io [xfs]{178320}, xfs_end_io [xfs]{178319}, xfs_end_io [xfs]{178316}, xfs_end_io [xfs]{178311}, xfs_end_io [xfs]{178302}, xfs_end_io [xfs]{178300}, xfs_end_io [xfs]{178296}, xfs_end_io [xfs]{178281}, xfs_end_io [xfs]{178276}, xfs_end_io [xfs]{178266}, xfs_end_io [xfs]{178265}, xfs_end_io [xfs]{178263}, xfs_end_io [xfs]{178260}
[ 575.197034] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256
[ 575.199866] in-flight: 3218:xfs_end_io [xfs]{178512}, 3216:xfs_end_io [xfs]{178509}, 3:xfs_end_io [xfs]{178467}, 33:xfs_end_io [xfs]{178425}, 101:xfs_end_io [xfs]{178403}, 4381:xfs_end_io [xfs]{178538}, 3219:xfs_end_io [xfs]{178425}
[ 575.208549] pending: xfs_end_io [xfs]{178405}, xfs_end_io [xfs]{178397}, xfs_end_io [xfs]{178389}, xfs_end_io [xfs]{178313}, xfs_end_io [xfs]{178282}, xfs_end_io [xfs]{178281}
[ 575.215489] workqueue xfs-reclaim/sda1: flags=0xc
[ 575.218281] workqueue xfs-sync/sda1: flags=0x4
[ 575.220637] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 575.223526] pending: xfs_log_worker [xfs]{171287}
[ 575.226102] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=178s workers=8 manager: 3224
[ 575.229489] pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=178s workers=6 manager: 3213
[ 575.233018] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=178s workers=9 manager: 47
[ 575.236383] pool 6: cpus=3 node=0 flags=0x0 nice=0 hung=33s workers=10 manager: 3217
[ 575.239771] pool 128: cpus=0-63 flags=0x4 nice=0 hung=152s workers=3 idle: 355 356
[ 605.720125] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 208s!
[ 605.736025] BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 209s!
[ 605.746669] BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 209s!
[ 605.755091] BUG: workqueue lockup - pool cpus=3 node=0 flags=0x0 nice=0 stuck for 64s!
[ 605.763390] Showing busy workqueues and worker pools:
[ 605.769436] workqueue events: flags=0x0
[ 605.772204] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=4/256
[ 605.775548] pending: console_callback{197431}, vmw_fb_dirty_flush [vmwgfx]{174896}, sysrq_reinject_alt_sysrq{174440}, push_to_pool{162245}
[ 605.780761] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=3/256
[ 605.783603] pending: e1000_watchdog [e1000]{207984}, check_corruption{166511}, rht_deferred_worker{28894}
[ 605.787725] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 605.790682] pending: vmpressure_work_fn{209065}, e1000_watchdog [e1000]{207615}
[ 605.794271] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 605.797150] pending: vmstat_shepherd{208067}
[ 605.799610] workqueue events_long: flags=0x0
[ 605.801951] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 605.805098] pending: gc_worker [nf_conntrack]{208961}
[ 605.807976] workqueue events_freezable: flags=0x4
[ 605.810391] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 605.813151] pending: vmballoon_work [vmw_balloon]{208085}
[ 605.815851] workqueue events_power_efficient: flags=0x80
[ 605.818382] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256
[ 605.821124] pending: check_lifetime{64453}
[ 605.823337] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 605.826091] pending: neigh_periodic_work{199329}
[ 605.828426] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 605.831068] pending: fb_flashcursor{209042}, do_cache_clean{201882}
[ 605.833902] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 605.836545] pending: neigh_periodic_work{195234}
[ 605.838838] workqueue events_freezable_power_: flags=0x84
[ 605.841295] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 605.843824] pending: disk_events_workfn{208625}
[ 605.846084] workqueue mm_percpu_wq: flags=0x8
[ 605.848145] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 605.850667] pending: drain_local_pages_wq{209047} BAR(4561){209047}
[ 605.853368] workqueue writeback: flags=0x4e
[ 605.855382] pwq 128: cpus=0-63 flags=0x4 nice=0 active=1/256
[ 605.857793] in-flight: 354:wb_workfn{182977}
[ 605.860182] workqueue xfs-data/sda1: flags=0xc
[ 605.862314] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=23/256 MAYDAY
[ 605.865010] in-flight: 3221:xfs_end_io [xfs]{209041}, 3212:xfs_end_io [xfs]{209158}, 29:xfs_end_io [xfs]{209200}, 3230:xfs_end_io [xfs]{209171}, 3229:xfs_end_io [xfs]{209099}, 50:xfs_end_io [xfs]{209099}, 3223:xfs_end_io [xfs]{209045}, 165:xfs_end_io [xfs]{209052}, 3215:xfs_end_io [xfs]{209046}
[ 605.874362] pending: xfs_end_io [xfs]{209011}, xfs_end_io [xfs]{209007}, xfs_end_io [xfs]{209007}, xfs_end_io [xfs]{208999}, xfs_end_io [xfs]{208977}, xfs_end_io [xfs]{208975}, xfs_end_io [xfs]{208970}, xfs_end_io [xfs]{208963}, xfs_end_io [xfs]{208963}, xfs_end_io [xfs]{208950}, xfs_end_io [xfs]{208948}, xfs_end_io [xfs]{208948}, xfs_end_io [xfs]{208946}, xfs_end_io [xfs]{30655}
[ 605.886882] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=28/256 MAYDAY
[ 605.889661] in-flight: 3225:xfs_end_io [xfs]{209249}, 236:xfs_end_io [xfs]{209163}, 23:xfs_end_io [xfs]{209151}, 3228:xfs_end_io [xfs]{209151}, 4380:xfs_end_io [xfs]{209259}, 3214:xfs_end_io [xfs]{209240}, 3220:xfs_end_io [xfs]{209212}, 3227:xfs_end_io [xfs]{209233}
[ 605.898706] pending: xfs_end_io [xfs]{209159}, xfs_end_io [xfs]{209149}, xfs_end_io [xfs]{209128}, xfs_end_io [xfs]{209128}, xfs_end_io [xfs]{209128}, xfs_end_io [xfs]{209128}, xfs_end_io [xfs]{209128}, xfs_end_io [xfs]{209116}, xfs_end_io [xfs]{209110}, xfs_end_io [xfs]{209096}, xfs_end_io [xfs]{209096}, xfs_end_io [xfs]{209092}, xfs_end_io [xfs]{209082}, xfs_end_io [xfs]{209061}, xfs_end_io [xfs]{209058}, xfs_end_io [xfs]{209051}, xfs_end_io [xfs]{209040}, xfs_end_io [xfs]{209021}, xfs_end_io [xfs]{209014}, xfs_end_io [xfs]{30678}
[ 605.917299] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=24/256 MAYDAY
[ 605.920254] in-flight: 375(RESCUER):xfs_end_io [xfs]{209194}, 42:xfs_end_io [xfs]{209278}, 3222:xfs_end_io [xfs]{209286}, 17:xfs_end_io [xfs]{209195}, 65:xfs_end_io [xfs]{209241}, 122:xfs_end_io [xfs]{209230}
[ 605.927845] pending: xfs_end_io [xfs]{209187}, xfs_end_io [xfs]{209154}, xfs_end_io [xfs]{209113}, xfs_end_io [xfs]{209088}, xfs_end_io [xfs]{209081}, xfs_end_io [xfs]{209071}, xfs_end_io [xfs]{209070}, xfs_end_io [xfs]{209067}, xfs_end_io [xfs]{209062}, xfs_end_io [xfs]{209053}, xfs_end_io [xfs]{209051}, xfs_end_io [xfs]{209047}, xfs_end_io [xfs]{209032}, xfs_end_io [xfs]{209027}, xfs_end_io [xfs]{209017}, xfs_end_io [xfs]{209016}, xfs_end_io [xfs]{209014}, xfs_end_io [xfs]{209011}
[ 605.944773] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256
[ 605.947616] in-flight: 3218:xfs_end_io [xfs]{209268}, 3216:xfs_end_io [xfs]{209265}, 3:xfs_end_io [xfs]{209223}, 33:xfs_end_io [xfs]{209181}, 101:xfs_end_io [xfs]{209159}, 4381:xfs_end_io [xfs]{209294}, 3219:xfs_end_io [xfs]{209181}
[ 605.956005] pending: xfs_end_io [xfs]{209149}, xfs_end_io [xfs]{209141}, xfs_end_io [xfs]{209133}, xfs_end_io [xfs]{209057}, xfs_end_io [xfs]{209026}, xfs_end_io [xfs]{209025}
[ 605.963018] workqueue xfs-sync/sda1: flags=0x4
[ 605.965455] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 605.968299] pending: xfs_log_worker [xfs]{202031}
[ 605.970872] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=209s workers=8 manager: 3224
[ 605.974252] pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=209s workers=6 manager: 3213
[ 605.977682] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=209s workers=9 manager: 47
[ 605.981015] pool 6: cpus=3 node=0 flags=0x0 nice=0 hung=64s workers=10 manager: 3217
[ 605.984382] pool 128: cpus=0-63 flags=0x4 nice=0 hung=183s workers=3 idle: 355 356
[ 605.989894] c.out: page allocation stalls for 209368ms, order:0, mode:0x1604040(GFP_NOFS|__GFP_COMP|__GFP_NOTRACK), nodemask=(null)
[ 605.994839] c.out cpuset=/ mems_allowed=0
[ 605.997152] CPU: 3 PID: 4561 Comm: c.out Not tainted 4.12.0-next-20170705+ #113
[ 606.000524] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
[ 606.004974] Call Trace:
[ 606.006766] dump_stack+0x63/0x8d
[ 606.008851] warn_alloc+0x10f/0x1b0
[ 606.010991] __alloc_pages_slowpath+0x8b9/0xd50
[ 606.013424] __alloc_pages_nodemask+0x20c/0x250
[ 606.015835] alloc_pages_current+0x65/0xd0
[ 606.018095] new_slab+0x472/0x600
[ 606.020117] ___slab_alloc+0x41b/0x590
[ 606.022255] ? kmem_alloc+0x8a/0x110 [xfs]
[ 606.024497] ? kmem_alloc+0x8a/0x110 [xfs]
[ 606.026751] __slab_alloc+0x1b/0x30
[ 606.028806] ? __save_stack_trace+0x70/0xf0
[ 606.031089] ? __slab_alloc+0x1b/0x30
[ 606.033145] __kmalloc+0x17e/0x200
[ 606.035111] kmem_alloc+0x8a/0x110 [xfs]
[ 606.037159] xfs_iext_inline_to_direct+0x1f/0x80 [xfs]
[ 606.039635] xfs_iext_realloc_direct+0xc6/0x140 [xfs]
[ 606.042052] xfs_iext_add+0x196/0x2e0 [xfs]
[ 606.044161] xfs_iext_insert+0x37/0xa0 [xfs]
[ 606.046305] xfs_bmap_add_extent_hole_delay+0xff/0x510 [xfs]
[ 606.048841] ? free_debug_processing+0x251/0x3a0
[ 606.051049] ? xfs_mod_fdblocks+0xa1/0x1a0 [xfs]
[ 606.053192] xfs_bmapi_reserve_delalloc+0x282/0x340 [xfs]
[ 606.055584] xfs_file_iomap_begin+0x574/0x750 [xfs]
[ 606.057856] ? iomap_write_begin.constprop.16+0x120/0x120
[ 606.060224] iomap_apply+0x55/0x110
[ 606.061927] ? iomap_write_begin.constprop.16+0x120/0x120
[ 606.064218] iomap_file_buffered_write+0x69/0x90
[ 606.066286] ? iomap_write_begin.constprop.16+0x120/0x120
[ 606.068538] xfs_file_buffered_aio_write+0xb7/0x200 [xfs]
[ 606.070807] xfs_file_write_iter+0x8d/0x130 [xfs]
[ 606.072890] __vfs_write+0xef/0x150
[ 606.074598] vfs_write+0xb0/0x190
[ 606.076173] SyS_write+0x50/0xc0
[ 606.077699] do_syscall_64+0x62/0x140
[ 606.079272] entry_SYSCALL64_slow_path+0x25/0x25
[ 606.081254] RIP: 0033:0x7f554047fc90
[ 606.082874] RSP: 002b:00007fffc842cc58 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 606.085745] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f554047fc90
[ 606.088406] RDX: 0000000000001000 RSI: 00000000006010c0 RDI: 0000000000000003
[ 606.091091] RBP: 0000000000000003 R08: 00007f55403df938 R09: 000000000000000e
[ 606.093839] R10: 00007fffc842c9e0 R11: 0000000000000246 R12: 000000000040085d
[ 606.096584] R13: 00007fffc842cd60 R14: 0000000000000000 R15: 0000000000000000
[ 606.099478] Mem-Info:
[ 606.100680] active_anon:836258 inactive_anon:5420 isolated_anon:0
[ 606.100680] active_file:99 inactive_file:64 isolated_file:65
[ 606.100680] unevictable:0 dirty:5 writeback:88 unstable:0
[ 606.100680] slab_reclaimable:0 slab_unreclaimable:93
[ 606.100680] mapped:3143 shmem:5581 pagetables:10619 bounce:0
[ 606.100680] free:21343 free_pcp:94 free_cma:0
[ 606.113419] Node 0 active_anon:3345032kB inactive_anon:21680kB active_file:396kB inactive_file:256kB unevictable:0kB isolated(anon):0kB isolated(file):260kB mapped:12572kB dirty:20kB writeback:352kB shmem:22324kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 2975744kB writeback_tmp:0kB unstable:0kB all_unreclaimable? yes
[ 606.123785] Node 0 DMA free:14836kB min:284kB low:352kB high:420kB active_anon:1032kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15988kB managed:15904kB mlocked:0kB kernel_stack:0kB pagetables:4kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 606.133156] lowmem_reserve[]: 0 2700 3642 3642
[ 606.135189] Node 0 DMA32 free:53284kB min:49888kB low:62360kB high:74832kB active_anon:2711124kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:3129216kB managed:2765492kB mlocked:0kB kernel_stack:0kB pagetables:4kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[ 606.145014] lowmem_reserve[]: 0 0 942 942
[ 606.146879] Node 0 Normal free:17252kB min:17404kB low:21752kB high:26100kB active_anon:632876kB inactive_anon:21680kB active_file:232kB inactive_file:468kB unevictable:0kB writepending:372kB present:1048576kB managed:964816kB mlocked:0kB kernel_stack:20944kB pagetables:42468kB bounce:0kB free_pcp:376kB local_pcp:100kB free_cma:0kB
[ 606.158166] lowmem_reserve[]: 0 0 0 0
[ 606.160059] Node 0 DMA: 1*4kB (U) 2*8kB (UM) 2*16kB (UM) 2*32kB (UM) 2*64kB (UM) 2*128kB (UM) 2*256kB (UM) 1*512kB (M) 1*1024kB (U) 0*2048kB 3*4096kB (M) = 14836kB
[ 606.166066] Node 0 DMA32: 1*4kB (U) 2*8kB (U) 3*16kB (U) 5*32kB (UM) 3*64kB (UM) 3*128kB (UM) 5*256kB (UM) 8*512kB (UM) 6*1024kB (UM) 2*2048kB (U) 9*4096kB (UME) = 53284kB
[ 606.172427] Node 0 Normal: 29*4kB (UM) 33*8kB (UM) 22*16kB (UME) 134*32kB (UME) 22*64kB (UE) 5*128kB (UME) 0*256kB 2*512kB (UM) 9*1024kB (M) 0*2048kB 0*4096kB = 17308kB
[ 606.178731] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB
[ 606.182325] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
[ 606.185806] 5816 total pagecache pages
[ 606.187829] 0 pages in swap cache
[ 606.189681] Swap cache stats: add 0, delete 0, find 0/0
[ 606.192165] Free swap = 0kB
[ 606.194020] Total swap = 0kB
[ 606.195774] 1048445 pages RAM
[ 606.197545] 0 pages HighMem/MovableOnly
[ 606.199536] 111892 pages reserved
[ 606.201413] 0 pages cma reserved
[ 606.203248] 0 pages hwpoisoned
[ 636.464050] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 30s!
[ 636.479332] BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 239s!
[ 636.488530] BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 239s!
[ 636.492635] BUG: workqueue lockup - pool cpus=3 node=0 flags=0x0 nice=0 stuck for 94s!
[ 636.496715] Showing busy workqueues and worker pools:
[ 636.499694] workqueue events: flags=0x0
[ 636.502181] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=4/256
[ 636.505801] pending: console_callback{228160}, vmw_fb_dirty_flush [vmwgfx]{205625}, sysrq_reinject_alt_sysrq{205169}, push_to_pool{192974}
[ 636.511750] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=3/256
[ 636.515126] pending: e1000_watchdog [e1000]{238720}, check_corruption{197247}, rht_deferred_worker{59630}
[ 636.519373] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 636.522146] pending: vmpressure_work_fn{239794}, e1000_watchdog [e1000]{238344}
[ 636.525433] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 636.528181] pending: vmstat_shepherd{238799}
[ 636.530540] workqueue events_long: flags=0x0
[ 636.532791] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 636.535576] pending: gc_worker [nf_conntrack]{239690}
[ 636.538146] workqueue events_freezable: flags=0x4
[ 636.540518] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 636.543224] pending: vmballoon_work [vmw_balloon]{238809}
[ 636.545964] workqueue events_power_efficient: flags=0x80
[ 636.548437] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256
[ 636.551131] pending: check_lifetime{95187}
[ 636.553297] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 636.555915] pending: neigh_periodic_work{230055}
[ 636.558186] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 636.560831] pending: fb_flashcursor{239776}, do_cache_clean{232616}
[ 636.563575] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 636.566117] pending: neigh_periodic_work{225958}
[ 636.568332] workqueue events_freezable_power_: flags=0x84
[ 636.570689] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 636.573190] pending: disk_events_workfn{239356}
[ 636.575368] workqueue writeback: flags=0x4e
[ 636.577296] pwq 128: cpus=0-63 flags=0x4 nice=0 active=1/256
[ 636.579702] in-flight: 354:wb_workfn{213696}
[ 636.582020] workqueue xfs-data/sda1: flags=0xc
[ 636.584000] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=23/256 MAYDAY
[ 636.586630] in-flight: 3221:xfs_end_io [xfs]{239760}, 3212:xfs_end_io [xfs]{239877}, 29:xfs_end_io [xfs]{239919}, 3230:xfs_end_io [xfs]{239890}, 3229:xfs_end_io [xfs]{239818}, 50:xfs_end_io [xfs]{239818}, 3223:xfs_end_io [xfs]{239764}, 165:xfs_end_io [xfs]{239771}, 3215:xfs_end_io [xfs]{239765}
[ 636.596055] pending: xfs_end_io [xfs]{239733}, xfs_end_io [xfs]{239729}, xfs_end_io [xfs]{239729}, xfs_end_io [xfs]{239721}, xfs_end_io [xfs]{239699}, xfs_end_io [xfs]{239697}, xfs_end_io [xfs]{239692}, xfs_end_io [xfs]{239685}, xfs_end_io [xfs]{239685}, xfs_end_io [xfs]{239672}, xfs_end_io [xfs]{239670}, xfs_end_io [xfs]{239670}, xfs_end_io [xfs]{239668}, xfs_end_io [xfs]{61377}
[ 636.609025] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=28/256 MAYDAY
[ 636.611804] in-flight: 3225:xfs_end_io [xfs]{239971}, 236:xfs_end_io [xfs]{239885}, 23:xfs_end_io [xfs]{239873}, 3228:xfs_end_io [xfs]{239873}, 4380:xfs_end_io [xfs]{239981}, 3214:xfs_end_io [xfs]{239962}, 3220:xfs_end_io [xfs]{239934}, 3227:xfs_end_io [xfs]{239955}
[ 636.620591] pending: xfs_end_io [xfs]{239880}, xfs_end_io [xfs]{239870}, xfs_end_io [xfs]{239849}, xfs_end_io [xfs]{239849}, xfs_end_io [xfs]{239849}, xfs_end_io [xfs]{239849}, xfs_end_io [xfs]{239849}, xfs_end_io [xfs]{239837}, xfs_end_io [xfs]{239831}, xfs_end_io [xfs]{239817}, xfs_end_io [xfs]{239817}, xfs_end_io [xfs]{239813}, xfs_end_io [xfs]{239803}, xfs_end_io [xfs]{239782}, xfs_end_io [xfs]{239779}, xfs_end_io [xfs]{239772}, xfs_end_io [xfs]{239761}, xfs_end_io [xfs]{239742}, xfs_end_io [xfs]{239735}, xfs_end_io [xfs]{61399}
[ 636.638457] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=24/256 MAYDAY
[ 636.641379] in-flight: 375(RESCUER):xfs_end_io [xfs]{239913}, 42:xfs_end_io [xfs]{239997}, 3222:xfs_end_io [xfs]{240005}, 17:xfs_end_io [xfs]{239914}, 65:xfs_end_io [xfs]{239960}, 122:xfs_end_io [xfs]{239949}
[ 636.648939] pending: xfs_end_io [xfs]{239909}, xfs_end_io [xfs]{239876}, xfs_end_io [xfs]{239835}, xfs_end_io [xfs]{239810}, xfs_end_io [xfs]{239803}, xfs_end_io [xfs]{239793}, xfs_end_io [xfs]{239792}, xfs_end_io [xfs]{239789}, xfs_end_io [xfs]{239784}, xfs_end_io [xfs]{239775}, xfs_end_io [xfs]{239773}, xfs_end_io [xfs]{239769}, xfs_end_io [xfs]{239754}, xfs_end_io [xfs]{239749}, xfs_end_io [xfs]{239739}, xfs_end_io [xfs]{239738}, xfs_end_io [xfs]{239736}, xfs_end_io [xfs]{239733}
[ 636.665876] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256 MAYDAY
[ 636.668887] in-flight: 3218:xfs_end_io [xfs]{239985}, 3216:xfs_end_io [xfs]{239982}, 3:xfs_end_io [xfs]{239940}, 33:xfs_end_io [xfs]{239898}, 101:xfs_end_io [xfs]{239876}, 4381:xfs_end_io [xfs]{240011}, 3219:xfs_end_io [xfs]{239898}
[ 636.677214] pending: xfs_end_io [xfs]{239868}, xfs_end_io [xfs]{239860}, xfs_end_io [xfs]{239852}, xfs_end_io [xfs]{239776}, xfs_end_io [xfs]{239745}, xfs_end_io [xfs]{239744}
[ 636.684203] workqueue xfs-sync/sda1: flags=0x4
[ 636.686584] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 636.689436] pending: xfs_log_worker [xfs]{232753}
[ 636.691989] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=30s workers=8 manager: 3224
[ 636.695341] pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=239s workers=6 manager: 3213
[ 636.698743] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=239s workers=9 manager: 47
[ 636.702057] pool 6: cpus=3 node=0 flags=0x0 nice=0 hung=95s workers=10 manager: 3217
[ 636.705626] pool 128: cpus=0-63 flags=0x4 nice=0 hung=213s workers=3 idle: 355 356
(...snipped...)
[ 759.360053] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 153s!
[ 759.375960] BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 362s!
[ 759.391621] BUG: workqueue lockup - pool cpus=2 node=0 flags=0x0 nice=0 stuck for 362s!
[ 759.398229] BUG: workqueue lockup - pool cpus=3 node=0 flags=0x0 nice=0 stuck for 217s!
[ 759.404705] Showing busy workqueues and worker pools:
[ 759.409228] workqueue events: flags=0x0
[ 759.413073] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=4/256
[ 759.418084] pending: console_callback{351071}, vmw_fb_dirty_flush [vmwgfx]{328536}, sysrq_reinject_alt_sysrq{328080}, push_to_pool{315885}
[ 759.426979] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=3/256
[ 759.432080] pending: e1000_watchdog [e1000]{361636}, check_corruption{320163}, rht_deferred_worker{182546}
[ 759.439485] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 759.444696] pending: vmpressure_work_fn{362715}, e1000_watchdog [e1000]{361265}
[ 759.450822] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 759.454480] pending: vmstat_shepherd{361724}
[ 759.456946] workqueue events_long: flags=0x0
[ 759.459238] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 759.462057] pending: gc_worker [nf_conntrack]{362616}
[ 759.464659] workqueue events_freezable: flags=0x4
[ 759.467040] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 759.469827] pending: vmballoon_work [vmw_balloon]{361728}
[ 759.472739] workqueue events_power_efficient: flags=0x80
[ 759.475236] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=1/256
[ 759.478058] pending: check_lifetime{218115}
[ 759.480357] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 759.483023] pending: neigh_periodic_work{352981}
[ 759.485355] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
[ 759.488029] pending: fb_flashcursor{362694}, do_cache_clean{355534}
[ 759.490781] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
[ 759.493357] pending: neigh_periodic_work{348876}
[ 759.495597] workqueue events_freezable_power_: flags=0x84
[ 759.498032] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 759.500545] pending: disk_events_workfn{362285}
[ 759.503818] workqueue writeback: flags=0x4e
[ 759.505835] pwq 128: cpus=0-63 flags=0x4 nice=0 active=1/256
[ 759.508299] in-flight: 354:wb_workfn{336620}
[ 759.510701] workqueue xfs-data/sda1: flags=0xc
[ 759.512740] pwq 6: cpus=3 node=0 flags=0x0 nice=0 active=23/256 MAYDAY
[ 759.515402] in-flight: 3221:xfs_end_io [xfs]{362676}, 3212:xfs_end_io [xfs]{362793}, 29:xfs_end_io [xfs]{362835}, 3230:xfs_end_io [xfs]{362806}, 3229:xfs_end_io [xfs]{362734}, 50:xfs_end_io [xfs]{362734}, 3223:xfs_end_io [xfs]{362680}, 165:xfs_end_io [xfs]{362687}, 3215:xfs_end_io [xfs]{362681}
[ 759.524948] pending: xfs_end_io [xfs]{362661}, xfs_end_io [xfs]{362657}, xfs_end_io [xfs]{362657}, xfs_end_io [xfs]{362649}, xfs_end_io [xfs]{362627}, xfs_end_io [xfs]{362625}, xfs_end_io [xfs]{362620}, xfs_end_io [xfs]{362613}, xfs_end_io [xfs]{362613}, xfs_end_io [xfs]{362600}, xfs_end_io [xfs]{362598}, xfs_end_io [xfs]{362598}, xfs_end_io [xfs]{362596}, xfs_end_io [xfs]{184305}
[ 759.537671] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=28/256 MAYDAY
[ 759.540432] in-flight: 3225:xfs_end_io [xfs]{362900}, 236:xfs_end_io [xfs]{362814}, 23:xfs_end_io [xfs]{362802}, 3228:xfs_end_io [xfs]{362802}, 4380:xfs_end_io [xfs]{362910}, 3214:xfs_end_io [xfs]{362891}, 3220:xfs_end_io [xfs]{362863}, 3227:xfs_end_io [xfs]{362884}
[ 759.549634] pending: xfs_end_io [xfs]{362809}, xfs_end_io [xfs]{362799}, xfs_end_io [xfs]{362778}, xfs_end_io [xfs]{362778}, xfs_end_io [xfs]{362778}, xfs_end_io [xfs]{362778}, xfs_end_io [xfs]{362778}, xfs_end_io [xfs]{362766}, xfs_end_io [xfs]{362760}, xfs_end_io [xfs]{362746}, xfs_end_io [xfs]{362746}, xfs_end_io [xfs]{362742}, xfs_end_io [xfs]{362732}, xfs_end_io [xfs]{362711}, xfs_end_io [xfs]{362708}, xfs_end_io [xfs]{362701}, xfs_end_io [xfs]{362690}, xfs_end_io [xfs]{362671}, xfs_end_io [xfs]{362664}, xfs_end_io [xfs]{184328}
[ 759.567586] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=24/256 MAYDAY
[ 759.570488] in-flight: 375(RESCUER):xfs_end_io [xfs]{362841}, 42:xfs_end_io [xfs]{362925}, 3222:xfs_end_io [xfs]{362933}, 17:xfs_end_io [xfs]{362842}, 65:xfs_end_io [xfs]{362888}, 122:xfs_end_io [xfs]{362877}
[ 759.578099] pending: xfs_end_io [xfs]{362827}, xfs_end_io [xfs]{362794}, xfs_end_io [xfs]{362753}, xfs_end_io [xfs]{362728}, xfs_end_io [xfs]{362721}, xfs_end_io [xfs]{362711}, xfs_end_io [xfs]{362710}, xfs_end_io [xfs]{362707}, xfs_end_io [xfs]{362702}, xfs_end_io [xfs]{362693}, xfs_end_io [xfs]{362691}, xfs_end_io [xfs]{362687}, xfs_end_io [xfs]{362672}, xfs_end_io [xfs]{362667}, xfs_end_io [xfs]{362657}, xfs_end_io [xfs]{362656}, xfs_end_io [xfs]{362654}, xfs_end_io [xfs]{362651}
[ 759.595092] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=13/256 MAYDAY
[ 759.598096] in-flight: 3218:xfs_end_io [xfs]{362911}, 3216:xfs_end_io [xfs]{362908}, 3:xfs_end_io [xfs]{362866}, 33:xfs_end_io [xfs]{362824}, 101:xfs_end_io [xfs]{362802}, 4381:xfs_end_io [xfs]{362937}, 3219:xfs_end_io [xfs]{362824}
[ 759.607196] pending: xfs_end_io [xfs]{362787}, xfs_end_io [xfs]{362779}, xfs_end_io [xfs]{362771}, xfs_end_io [xfs]{362695}, xfs_end_io [xfs]{362664}, xfs_end_io [xfs]{362663}
[ 759.614201] workqueue xfs-eofblocks/sda1: flags=0xc
[ 759.616695] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 759.619543] in-flight: 380(RESCUER):xfs_eofblocks_worker [xfs]{99164}
[ 759.622697] workqueue xfs-sync/sda1: flags=0x4
[ 759.625087] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
[ 759.627992] pending: xfs_log_worker [xfs]{355689}
[ 759.630545] pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=153s workers=8 manager: 3224
[ 759.633960] pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=362s workers=6 manager: 3213
[ 759.637414] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=362s workers=9 manager: 47
[ 759.640746] pool 6: cpus=3 node=0 flags=0x0 nice=0 hung=217s workers=10 manager: 3217
[ 759.644187] pool 128: cpus=0-63 flags=0x4 nice=0 hung=336s workers=3 idle: 355 356
(...snipped...)
[ 773.195011] mm_percpu_wq S14768 6 2 0x00000000
[ 773.197070] Call Trace:
[ 773.198171] __schedule+0x23f/0x5d0
[ 773.199614] ? _cond_resched+0x15/0x40
[ 773.201175] schedule+0x31/0x80
[ 773.202553] rescuer_thread+0x343/0x390
[ 773.204076] kthread+0xff/0x140
[ 773.205415] ? worker_thread+0x410/0x410
[ 773.207171] ? kthread_create_on_node+0x60/0x60
[ 773.209045] ret_from_fork+0x25/0x30
(...snipped...)
[ 794.604916] c.out D11856 4561 4382 0x00000080
[ 794.606998] Call Trace:
[ 794.608142] __schedule+0x23f/0x5d0
[ 794.609694] schedule+0x31/0x80
[ 794.611040] schedule_timeout+0x189/0x290
[ 794.612740] ? set_track+0x6b/0x140
[ 794.614287] ? del_timer_sync+0x40/0x40
[ 794.615844] io_schedule_timeout+0x19/0x40
[ 794.617544] ? io_schedule_timeout+0x19/0x40
[ 794.619275] congestion_wait+0x7d/0xd0
[ 794.620806] ? wait_woken+0x80/0x80
[ 794.622294] shrink_inactive_list+0x3e3/0x4d0
[ 794.624074] shrink_node_memcg+0x360/0x780
[ 794.625707] ? list_lru_count_one+0x65/0x70
[ 794.627628] shrink_node+0xdc/0x310
[ 794.629121] ? shrink_node+0xdc/0x310
[ 794.630621] do_try_to_free_pages+0xea/0x370
[ 794.632338] try_to_free_pages+0xc3/0x100
[ 794.633986] __alloc_pages_slowpath+0x441/0xd50
[ 794.635750] __alloc_pages_nodemask+0x20c/0x250
[ 794.637731] alloc_pages_current+0x65/0xd0
[ 794.639548] new_slab+0x472/0x600
[ 794.640943] ___slab_alloc+0x41b/0x590
[ 794.642546] ? kmem_alloc+0x8a/0x110 [xfs]
[ 794.644269] ? kmem_alloc+0x8a/0x110 [xfs]
[ 794.645892] __slab_alloc+0x1b/0x30
[ 794.647355] ? __save_stack_trace+0x70/0xf0
[ 794.649032] ? __slab_alloc+0x1b/0x30
[ 794.650515] __kmalloc+0x17e/0x200
[ 794.651923] kmem_alloc+0x8a/0x110 [xfs]
[ 794.653485] xfs_iext_inline_to_direct+0x1f/0x80 [xfs]
[ 794.655458] xfs_iext_realloc_direct+0xc6/0x140 [xfs]
[ 794.657394] xfs_iext_add+0x196/0x2e0 [xfs]
[ 794.659096] xfs_iext_insert+0x37/0xa0 [xfs]
[ 794.660752] xfs_bmap_add_extent_hole_delay+0xff/0x510 [xfs]
[ 794.662852] ? free_debug_processing+0x251/0x3a0
[ 794.664776] ? xfs_mod_fdblocks+0xa1/0x1a0 [xfs]
[ 794.666598] xfs_bmapi_reserve_delalloc+0x282/0x340 [xfs]
[ 794.668635] xfs_file_iomap_begin+0x574/0x750 [xfs]
[ 794.670566] ? iomap_write_begin.constprop.16+0x120/0x120
[ 794.672638] iomap_apply+0x55/0x110
[ 794.674128] ? iomap_write_begin.constprop.16+0x120/0x120
[ 794.676207] iomap_file_buffered_write+0x69/0x90
[ 794.677985] ? iomap_write_begin.constprop.16+0x120/0x120
[ 794.680117] xfs_file_buffered_aio_write+0xb7/0x200 [xfs]
[ 794.682184] xfs_file_write_iter+0x8d/0x130 [xfs]
[ 794.684043] __vfs_write+0xef/0x150
[ 794.685481] vfs_write+0xb0/0x190
[ 794.686943] SyS_write+0x50/0xc0
[ 794.688310] do_syscall_64+0x62/0x140
[ 794.689862] entry_SYSCALL64_slow_path+0x25/0x25
----------
Well, looking at the traces as of uptime = 465, drain_local_pages_wq was
stuck at wait_for_completion() from flush_work()
----------
bool flush_work(struct work_struct *work)
{
struct wq_barrier barr;
if (WARN_ON(!wq_online))
return false;
lock_map_acquire(&work->lockdep_map);
lock_map_release(&work->lockdep_map);
if (start_flush_work(work, &barr)) {
wait_for_completion(&barr.done);
destroy_work_on_stack(&barr.work);
return true;
} else {
return false;
}
}
----------
which can be called on multiple CPUs from drain_all_pages().
----------
void drain_all_pages(struct zone *zone)
{
(...snipped...)
for_each_cpu(cpu, &cpus_with_pcps) {
struct work_struct *work = per_cpu_ptr(&pcpu_drain, cpu);
INIT_WORK(work, drain_local_pages_wq);
queue_work_on(cpu, mm_percpu_wq, work);
}
for_each_cpu(cpu, &cpus_with_pcps)
flush_work(per_cpu_ptr(&pcpu_drain, cpu));
(...snipped...)
}
----------
If start_flush_work() returned true (well, since we will fail to wait for
completion of drain_local_pages_wq() if start_flush_work() returned false,
start_flush_work() is expected to return true), we wait for completion.
flush_work() in drain_all_pages() expected that per_cpu_ptr(&pcpu_drain, cpu) is
processed as soon as possible using mm_percpu_wq thread (PID = 6) if memory
cannot be allocated.
Since drain_local_pages_wq work was stalling for 144 seconds as of uptime = 541,
drain_local_pages_wq work was queued around uptime = 397 (which is about 6 seconds
since the OOM killer/reaper reclaimed some memory for the last time).
But as far as I can see from traces, the mm_percpu_wq thread as of uptime = 444 was
idle, while drain_local_pages_wq work was pending from uptime = 541 to uptime = 605.
This means that the mm_percpu_wq thread did not start processing drain_local_pages_wq
work immediately. (I don't know what made drain_local_pages_wq work be processed.)
Why? Is this a workqueue implementation bug? Is this a workqueue usage bug?
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