Recompiled v4.13-rc6 with debug info and lockdep.
Unfortunately, still cannot use crash utility because 7.1.9 does not support
v4.13 (and git HEAD with required fix for 5-level pagetable does not compile
for me).
But I've got much nicer stacktrace + lockdep output (check paste below).
Looks like kernel is blocked on device mutex here:
1510 void scsi_rescan_device(struct device *dev)
1511 {
1512 struct scsi_device *sdev = to_scsi_device(dev);
1513
1514 device_lock(dev); // here
and md0_raid10 kthread is blocked on I/O scheduling point in blk_mq_get_tag().
Again, with blk-mq this issue is not reproducible.
===
[ 62.789665] INFO: task kworker/2:1:36 blocked for more than 20 seconds.
[ 62.793858] Not tainted 4.13.0-rc6 #3
[ 62.796537] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 62.800467] kworker/2:1 D13856 36 2 0x00000000
[ 62.802934] Workqueue: events ata_scsi_dev_rescan
[ 62.805207] Call Trace:
[ 62.806957] __schedule+0x8d7/0x930
[ 62.809956] schedule+0x73/0x90
[ 62.812677] schedule_preempt_disabled+0x13/0x20
[ 62.816012] __mutex_lock+0x54f/0x820
[ 62.819050] ? scsi_rescan_device+0x21/0x90
[ 62.821930] ? mark_held_locks+0x58/0x80
[ 62.823994] mutex_lock_nested+0x16/0x20
[ 62.825984] ? mutex_lock_nested+0x16/0x20
[ 62.828032] scsi_rescan_device+0x21/0x90
[ 62.830174] ata_scsi_dev_rescan+0xa1/0x110
[ 62.832732] process_one_work+0x32a/0x620
[ 62.835328] worker_thread+0x221/0x3f0
[ 62.837553] kthread+0x124/0x130
[ 62.839215] ? process_one_work+0x620/0x620
[ 62.841293] ? kthread_stop+0x260/0x260
[ 62.843887] ret_from_fork+0x2a/0x40
[ 62.846664] INFO: task kworker/0:1:37 blocked for more than 20 seconds.
[ 62.849751] Not tainted 4.13.0-rc6 #3
[ 62.851724] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 62.856832] kworker/0:1 D13664 37 2 0x00000000
[ 62.859750] Workqueue: events ata_scsi_dev_rescan
[ 62.862611] Call Trace:
[ 62.864213] __schedule+0x8d7/0x930
[ 62.866859] schedule+0x73/0x90
[ 62.869507] schedule_preempt_disabled+0x13/0x20
[ 62.871662] __mutex_lock+0x54f/0x820
[ 62.873541] ? scsi_rescan_device+0x21/0x90
[ 62.875580] ? mark_held_locks+0x58/0x80
[ 62.877871] mutex_lock_nested+0x16/0x20
[ 62.880760] ? mutex_lock_nested+0x16/0x20
[ 62.883544] scsi_rescan_device+0x21/0x90
[ 62.886288] ata_scsi_dev_rescan+0xa1/0x110
[ 62.888766] process_one_work+0x32a/0x620
[ 62.891593] worker_thread+0x221/0x3f0
[ 62.894223] kthread+0x124/0x130
[ 62.895974] ? process_one_work+0x620/0x620
[ 62.898643] ? kthread_stop+0x260/0x260
[ 62.902062] ret_from_fork+0x2a/0x40
[ 62.905109] INFO: task kworker/1:1:40 blocked for more than 20 seconds.
[ 62.908068] Not tainted 4.13.0-rc6 #3
[ 62.910115] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 62.913326] kworker/1:1 D13888 40 2 0x00000000
[ 62.915904] Workqueue: events ata_scsi_dev_rescan
[ 62.918133] Call Trace:
[ 62.919958] __schedule+0x8d7/0x930
[ 62.922615] schedule+0x73/0x90
[ 62.925042] schedule_preempt_disabled+0x13/0x20
[ 62.928377] __mutex_lock+0x54f/0x820
[ 62.930915] ? scsi_rescan_device+0x21/0x90
[ 62.933510] ? mark_held_locks+0x58/0x80
[ 62.936079] mutex_lock_nested+0x16/0x20
[ 62.938122] ? mutex_lock_nested+0x16/0x20
[ 62.940394] scsi_rescan_device+0x21/0x90
[ 62.942405] ata_scsi_dev_rescan+0xa1/0x110
[ 62.944491] process_one_work+0x32a/0x620
[ 62.946580] worker_thread+0x221/0x3f0
[ 62.948719] kthread+0x124/0x130
[ 62.950708] ? process_one_work+0x620/0x620
[ 62.953185] ? kthread_stop+0x260/0x260
[ 62.955792] ret_from_fork+0x2a/0x40
[ 62.958235] INFO: task md0_raid10:1716 blocked for more than 20 seconds.
[ 62.962058] Not tainted 4.13.0-rc6 #3
[ 62.965328] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 62.970630] md0_raid10 D13696 1716 2 0x00000000
[ 62.972990] Call Trace:
[ 62.975155] __schedule+0x8d7/0x930
[ 62.977618] ? sbitmap_get+0x4e/0xa0
[ 62.979601] schedule+0x73/0x90
[ 62.981206] io_schedule+0x11/0x40
[ 62.982862] blk_mq_get_tag+0x13e/0x250
[ 62.984641] ? blk_mq_get_request+0xdb/0x400
[ 62.986555] ? do_wait_intr_irq+0x80/0x80
[ 62.988503] blk_mq_get_request+0x1a8/0x400
[ 62.990636] blk_mq_make_request+0x22f/0x7c0
[ 62.992783] ? generic_make_request+0xcb/0x360
[ 62.995084] generic_make_request+0xf8/0x360
[ 62.997735] submit_bio+0x10f/0x120
[ 62.999500] ? submit_bio+0x10f/0x120
[ 63.002395] md_super_write+0xc8/0xe0
[ 63.005273] md_update_sb+0x533/0x6e0
[ 63.007286] md_check_recovery+0x1ee/0x4b0
[ 63.010229] raid10d+0x4b/0x15e0
[ 63.012121] ? finish_wait+0x57/0x60
[ 63.015065] ? trace_hardirqs_on_caller+0x178/0x1a0
[ 63.018147] ? trace_hardirqs_on+0xd/0x10
[ 63.020969] md_thread+0xd9/0x120
[ 63.023033] ? md_thread+0xd9/0x120
[ 63.025723] ? do_wait_intr_irq+0x80/0x80
[ 63.028288] kthread+0x124/0x130
[ 63.029947] ? find_pers+0x60/0x60
[ 63.031410] ? kthread_stop+0x260/0x260
[ 63.032922] ? umh_complete+0x40/0x40
[ 63.034415] ? call_usermodehelper_exec_async+0x12f/0x160
[ 63.037659] ret_from_fork+0x2a/0x40
[ 63.039245] INFO: task md0_resync:1720 blocked for more than 20 seconds.
[ 63.042346] Not tainted 4.13.0-rc6 #3
[ 63.044393] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 63.048591] md0_resync D13104 1720 2 0x00000000
[ 63.051279] Call Trace:
[ 63.053335] __schedule+0x8d7/0x930
[ 63.056151] ? blk_flush_plug_list+0xd5/0x250
[ 63.058725] schedule+0x73/0x90
[ 63.060382] io_schedule+0x11/0x40
[ 63.062212] blk_mq_get_tag+0x13e/0x250
[ 63.064222] ? blk_mq_get_request+0xdb/0x400
[ 63.066339] ? do_wait_intr_irq+0x80/0x80
[ 63.068875] blk_mq_get_request+0x1a8/0x400
[ 63.071329] blk_mq_make_request+0x22f/0x7c0
[ 63.073599] ? generic_make_request+0xcb/0x360
[ 63.076392] generic_make_request+0xf8/0x360
[ 63.078033] raid10_sync_request+0x214a/0x2290
[ 63.080008] ? raid10_sync_request+0x214a/0x2290
[ 63.081820] ? find_held_lock+0x35/0xa0
[ 63.083345] ? rcu_read_unlock+0x3e/0x5d
[ 63.086222] ? is_mddev_idle+0x101/0x113
[ 63.088684] md_do_sync+0x960/0xe90
[ 63.090960] ? do_wait_intr_irq+0x80/0x80
[ 63.093329] md_thread+0xd9/0x120
[ 63.095277] ? md_thread+0xd9/0x120
[ 63.097438] ? trace_hardirqs_on+0xd/0x10
[ 63.100310] kthread+0x124/0x130
[ 63.102471] ? find_pers+0x60/0x60
[ 63.104895] ? kthread_stop+0x260/0x260
[ 63.107208] ? umh_complete+0x40/0x40
[ 63.110149] ? call_usermodehelper_exec_async+0x12f/0x160
[ 63.113570] ret_from_fork+0x2a/0x40
[ 63.138339] INFO: task systemd-sleep:2599 blocked for more than 20 seconds.
[ 63.141320] Not tainted 4.13.0-rc6 #3
[ 63.143560] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 63.147738] systemd-sleep D12640 2599 1 0x00000080
[ 63.150645] Call Trace:
[ 63.152842] __schedule+0x8d7/0x930
[ 63.156430] schedule+0x73/0x90
[ 63.158521] async_synchronize_cookie_domain+0x6c/0xa0
[ 63.161252] ? do_wait_intr_irq+0x80/0x80
[ 63.163461] async_synchronize_full+0x12/0x20
[ 63.166359] dpm_resume+0x303/0x480
[ 63.168656] ? rcu_read_lock_sched_held+0x78/0xa0
[ 63.171555] dpm_resume_end+0xc/0x20
[ 63.174369] suspend_devices_and_enter+0x62f/0x990
[ 63.177177] ? printk+0x3e/0x46
[ 63.179845] ? rcu_read_lock_sched_held+0x78/0xa0
[ 63.182931] pm_suspend+0x2a8/0x490
[ 63.185463] state_store+0xaf/0xe0
[ 63.187429] kobj_attr_store+0xf/0x20
[ 63.190402] sysfs_kf_write+0x3d/0x50
[ 63.192772] kernfs_fop_write+0x114/0x180
[ 63.195435] __vfs_write+0x23/0x110
[ 63.197935] ? rcu_read_lock_sched_held+0x78/0xa0
[ 63.201616] ? rcu_sync_lockdep_assert+0x27/0x50
[ 63.204820] ? __sb_start_write+0x95/0x1f0
[ 63.207522] vfs_write+0xc0/0x180
[ 63.209411] SyS_write+0x44/0xa0
[ 63.211155] do_syscall_64+0x64/0x120
[ 63.212996] entry_SYSCALL64_slow_path+0x25/0x25
[ 63.215264] RIP: 0033:0x7f160e214bf0
[ 63.217244] RSP: 002b:00007fffa8f08e08 EFLAGS: 00000246 ORIG_RAX:
0000000000000001
[ 63.222682] RAX: ffffffffffffffda RBX: 0000000000000004 RCX:
00007f160e214bf0
[ 63.226774] RDX: 0000000000000004 RSI: 0000565398088390 RDI:
0000000000000004
[ 63.231227] RBP: 0000565398088390 R08: 0000565398088240 R09:
00007f160e6e28c0
[ 63.234773] R10: 00007f160e4d5ad8 R11: 0000000000000246 R12:
0000000000000004
[ 63.237877] R13: 0000000000000001 R14: 0000565398088160 R15:
0000000000000004
[ 63.240832] INFO: task kworker/u8:20:2615 blocked for more than 20 seconds.
[ 63.243874] Not tainted 4.13.0-rc6 #3
[ 63.246036] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 63.249754] kworker/u8:20 D14128 2615 2 0x00000080
[ 63.252260] Workqueue: events_unbound async_run_entry_fn
[ 63.254765] Call Trace:
[ 63.256338] __schedule+0x8d7/0x930
[ 63.258270] schedule+0x73/0x90
[ 63.260107] async_synchronize_cookie_domain+0x6c/0xa0
[ 63.262473] ? do_wait_intr_irq+0x80/0x80
[ 63.264494] ? async_sdev_thaw+0x20/0x20
[ 63.266467] ? scsi_bus_thaw+0x20/0x20
[ 63.268372] async_synchronize_full_domain+0x13/0x20
[ 63.271074] scsi_bus_resume_common+0x95/0x140
[ 63.274168] scsi_bus_resume+0x10/0x20
[ 63.277058] dpm_run_callback+0x142/0x290
[ 63.279259] device_resume+0x192/0x1e0
[ 63.280883] async_resume+0x18/0x40
[ 63.282321] async_run_entry_fn+0x32/0xd0
[ 63.283856] process_one_work+0x32a/0x620
[ 63.285390] worker_thread+0x221/0x3f0
[ 63.286885] kthread+0x124/0x130
[ 63.288515] ? process_one_work+0x620/0x620
[ 63.290482] ? kthread_stop+0x260/0x260
[ 63.292203] ret_from_fork+0x2a/0x40
[ 63.294060] INFO: task kworker/u8:21:2616 blocked for more than 20 seconds.
[ 63.296818] Not tainted 4.13.0-rc6 #3
[ 63.299821] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 63.305221] kworker/u8:21 D14392 2616 2 0x00000080
[ 63.308313] Workqueue: events_unbound async_run_entry_fn
[ 63.312513] Call Trace:
[ 63.314752] __schedule+0x8d7/0x930
[ 63.317683] schedule+0x73/0x90
[ 63.319485] async_synchronize_cookie_domain+0x6c/0xa0
[ 63.321883] ? do_wait_intr_irq+0x80/0x80
[ 63.323875] ? async_sdev_thaw+0x20/0x20
[ 63.325848] ? scsi_bus_thaw+0x20/0x20
[ 63.328287] async_synchronize_full_domain+0x13/0x20
[ 63.330451] scsi_bus_resume_common+0x95/0x140
[ 63.332381] scsi_bus_resume+0x10/0x20
[ 63.334129] dpm_run_callback+0x142/0x290
[ 63.336353] device_resume+0x192/0x1e0
[ 63.338854] async_resume+0x18/0x40
[ 63.341101] async_run_entry_fn+0x32/0xd0
[ 63.343197] process_one_work+0x32a/0x620
[ 63.345300] worker_thread+0x221/0x3f0
[ 63.347356] kthread+0x124/0x130
[ 63.349463] ? process_one_work+0x620/0x620
[ 63.352192] ? kthread_stop+0x260/0x260
[ 63.354697] ret_from_fork+0x2a/0x40
[ 63.357611] INFO: task kworker/u8:22:2617 blocked for more than 20 seconds.
[ 63.361106] Not tainted 4.13.0-rc6 #3
[ 63.363990] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 63.367847] kworker/u8:22 D14392 2617 2 0x00000080
[ 63.370561] Workqueue: events_unbound async_run_entry_fn
[ 63.374235] Call Trace:
[ 63.376351] __schedule+0x8d7/0x930
[ 63.379545] schedule+0x73/0x90
[ 63.382199] async_synchronize_cookie_domain+0x6c/0xa0
[ 63.385132] ? do_wait_intr_irq+0x80/0x80
[ 63.387533] ? async_sdev_thaw+0x20/0x20
[ 63.389684] ? scsi_bus_thaw+0x20/0x20
[ 63.391849] async_synchronize_full_domain+0x13/0x20
[ 63.395454] scsi_bus_resume_common+0x95/0x140
[ 63.397842] scsi_bus_resume+0x10/0x20
[ 63.399883] dpm_run_callback+0x142/0x290
[ 63.402873] device_resume+0x192/0x1e0
[ 63.405915] async_resume+0x18/0x40
[ 63.408723] async_run_entry_fn+0x32/0xd0
[ 63.411627] process_one_work+0x32a/0x620
[ 63.413672] worker_thread+0x221/0x3f0
[ 63.415661] kthread+0x124/0x130
[ 63.417452] ? process_one_work+0x620/0x620
[ 63.419750] ? kthread_stop+0x260/0x260
[ 63.421781] ret_from_fork+0x2a/0x40
[ 63.423653] INFO: task kworker/u8:24:2619 blocked for more than 20 seconds.
[ 63.426647] Not tainted 4.13.0-rc6 #3
[ 63.428599] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.
[ 63.431762] kworker/u8:24 D14416 2619 2 0x00000080
[ 63.433650] Workqueue: events_unbound async_run_entry_fn
[ 63.435956] Call Trace:
[ 63.437711] __schedule+0x8d7/0x930
[ 63.440567] ? sbitmap_get+0x4e/0xa0
[ 63.442571] schedule+0x73/0x90
[ 63.444331] io_schedule+0x11/0x40
[ 63.446731] blk_mq_get_tag+0x13e/0x250
[ 63.448974] ? blk_mq_get_request+0xdb/0x400
[ 63.451208] ? do_wait_intr_irq+0x80/0x80
[ 63.453716] blk_mq_get_request+0x1a8/0x400
[ 63.455700] blk_mq_alloc_request+0x56/0xc0
[ 63.457883] blk_get_request+0x29/0x100
[ 63.459658] scsi_execute+0x3b/0x230
[ 63.461536] sd_start_stop_device+0x93/0x120
[ 63.463616] sd_resume+0x67/0x70
[ 63.465310] do_scsi_resume+0x16/0x20
[ 63.467217] scsi_dev_type_resume+0x26/0x70
[ 63.469287] async_sdev_resume+0x10/0x20
[ 63.471178] async_run_entry_fn+0x32/0xd0
[ 63.473197] process_one_work+0x32a/0x620
[ 63.474939] worker_thread+0x221/0x3f0
[ 63.476752] kthread+0x124/0x130
[ 63.478406] ? process_one_work+0x620/0x620
[ 63.480031] ? kthread_stop+0x260/0x260
[ 63.481579] ret_from_fork+0x2a/0x40
[ 63.483548]
Showing all locks held in the system:
[ 63.487087] 4 locks held by kworker/2:1/36:
[ 63.489578] #0: ("events"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.494571] #1: ((&ap->scsi_rescan_task)){+.+...}, at:
[<ffffffff8109f083>] process_one_work+0x1b3/0x620
[ 63.499045] #2: (&ap->scsi_scan_mutex){+.+...}, at: [<ffffffff816f9074>]
ata_scsi_dev_rescan+0x34/0x110
[ 63.505049] #3: (&dev->mutex){......}, at: [<ffffffff816d4b41>]
scsi_rescan_device+0x21/0x90
[ 63.510159] 4 locks held by kworker/0:1/37:
[ 63.512237] #0: ("events"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.516225] #1: ((&ap->scsi_rescan_task)){+.+...}, at:
[<ffffffff8109f083>] process_one_work+0x1b3/0x620
[ 63.520622] #2: (&ap->scsi_scan_mutex){+.+...}, at: [<ffffffff816f9074>]
ata_scsi_dev_rescan+0x34/0x110
[ 63.524931] #3: (&dev->mutex){......}, at: [<ffffffff816d4b41>]
scsi_rescan_device+0x21/0x90
[ 63.528790] 4 locks held by kworker/1:1/40:
[ 63.530879] #0: ("events"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.536187] #1: ((&ap->scsi_rescan_task)){+.+...}, at:
[<ffffffff8109f083>] process_one_work+0x1b3/0x620
[ 63.540720] #2: (&ap->scsi_scan_mutex){+.+...}, at: [<ffffffff816f9074>]
ata_scsi_dev_rescan+0x34/0x110
[ 63.544863] #3: (&dev->mutex){......}, at: [<ffffffff816d4b41>]
scsi_rescan_device+0x21/0x90
[ 63.549947] 1 lock held by khungtaskd/461:
[ 63.552274] #0: (tasklist_lock){.+.+..}, at: [<ffffffff810ce5da>]
debug_show_all_locks+0x4a/0x170
[ 63.557027] 1 lock held by md0_raid10/1716:
[ 63.559209] #0: (&mddev->reconfig_mutex){+.+.+.}, at:
[<ffffffff81832cc7>] md_check_recovery+0xe7/0x4b0
[ 63.587846] 2 locks held by btrfs-transacti/1867:
[ 63.590223] #0: (&fs_info->transaction_kthread_mutex){+.+...}, at:
[<ffffffff81372779>] transaction_kthread+0x49/0x190
[ 63.595024] #1: (&fs_info->tree_log_mutex){+.+...}, at:
[<ffffffff81377c1a>] btrfs_commit_transaction+0x3aa/0x910
[ 63.600911] 5 locks held by systemd-sleep/2599:
[ 63.603394] #0: (sb_writers#5){.+.+.+}, at: [<ffffffff811eaeaf>]
vfs_write+0xaf/0x180
[ 63.607819] #1: (&of->mutex){+.+.+.}, at: [<ffffffff8126bf99>]
kernfs_fop_write+0xb9/0x180
[ 63.612001] #2: (s_active#146){.+.+.+}, at: [<ffffffff8126bfa1>]
kernfs_fop_write+0xc1/0x180
[ 63.616079] #3: (pm_mutex){+.+.+.}, at: [<ffffffff810d89f2>] pm_suspend
+0x472/0x490
[ 63.621514] #4: (acpi_scan_lock){+.+.+.}, at: [<ffffffff814e53e2>]
acpi_scan_lock_acquire+0x12/0x20
[ 63.627617] 3 locks held by kworker/u8:20/2615:
[ 63.629583] #0: ("events_unbound"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.633125] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.636934] #2: (&dev->mutex){......}, at: [<ffffffff816ae8f9>]
device_resume+0x89/0x1e0
[ 63.641510] 3 locks held by kworker/u8:21/2616:
[ 63.643984] #0: ("events_unbound"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.649344] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.655669] #2: (&dev->mutex){......}, at: [<ffffffff816ae8f9>]
device_resume+0x89/0x1e0
[ 63.660176] 3 locks held by kworker/u8:22/2617:
[ 63.662542] #0: ("events_unbound"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.668704] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.674307] #2: (&dev->mutex){......}, at: [<ffffffff816ae8f9>]
device_resume+0x89/0x1e0
[ 63.678492] 2 locks held by kworker/u8:24/2619:
[ 63.680737] #0: ("events_unbound"){.+.+.+}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.685153] #1: ((&entry->work)){+.+.+.}, at: [<ffffffff8109f083>]
process_one_work+0x1b3/0x620
[ 63.689648]
[ 63.691151] =============================================
===
On sobota 26. srpna 2017 12:48:01 CEST Oleksandr Natalenko wrote:
> Quick update: reproduced on both v4.12.7 and v4.13.0-rc6.
> …SNIP…
