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Message-ID: <YzVkyxSjifFghj8H@zn.tnic>
Date: Thu, 29 Sep 2022 11:26:35 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Paul E. McKenney" <paulmck@...nel.org>
Cc: x86-ml <x86@...nel.org>, lkml <linux-kernel@...r.kernel.org>
Subject: INFO: task rcu_gp:3 blocked for more than 122 seconds.
Hi Paul,
Mr. Z says I should show this to you.
It is latest Linus + latest tip/master. Happens at boot on one of my
test boxes.
[ 249.149378] INFO: task rcu_gp:3 blocked for more than 122 seconds.
[ 249.155726] Not tainted 6.0.0-rc7+ #1
[ 249.160025] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.168000] task:rcu_gp state:I stack:0 pid:3 ppid:2 flags:0x00004000
[ 249.176483] Call Trace:
[ 249.178997] <TASK>
[ 249.181171] __schedule+0x38f/0x1490
[ 249.184864] schedule+0x5d/0xe0
[ 249.188086] rescuer_thread+0x2f8/0x390
[ 249.192044] ? worker_thread+0x3f0/0x3f0
[ 249.196043] kthread+0xe6/0x110
[ 249.199282] ? kthread_complete_and_exit+0x20/0x20
[ 249.204179] ret_from_fork+0x22/0x30
[ 249.207914] </TASK>
[ 249.210157] INFO: task rcu_par_gp:4 blocked for more than 122 seconds.
[ 249.216785] Not tainted 6.0.0-rc7+ #1
[ 249.221040] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.228974] task:rcu_par_gp state:I stack:0 pid:4 ppid:2 flags:0x00004000
[ 249.237449] Workqueue: 0x0 (rcu_par_gp)
[ 249.241437] Call Trace:
[ 249.243944] <TASK>
[ 249.246099] __schedule+0x38f/0x1490
[ 249.249743] schedule+0x5d/0xe0
[ 249.252941] rescuer_thread+0x2f8/0x390
[ 249.256831] ? worker_thread+0x3f0/0x3f0
[ 249.260811] kthread+0xe6/0x110
[ 249.263997] ? kthread_complete_and_exit+0x20/0x20
[ 249.268836] ret_from_fork+0x22/0x30
[ 249.272482] </TASK>
[ 249.274699] INFO: task slub_flushwq:5 blocked for more than 123 seconds.
[ 249.281463] Not tainted 6.0.0-rc7+ #1
[ 249.285692] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.293596] task:slub_flushwq state:I stack:0 pid:5 ppid:2 flags:0x00004000
[ 249.302039] Call Trace:
[ 249.304535] <TASK>
[ 249.306669] __schedule+0x38f/0x1490
[ 249.310314] schedule+0x5d/0xe0
[ 249.313496] rescuer_thread+0x2f8/0x390
[ 249.317388] ? worker_thread+0x3f0/0x3f0
[ 249.321355] kthread+0xe6/0x110
[ 249.324536] ? kthread_complete_and_exit+0x20/0x20
[ 249.329380] ret_from_fork+0x22/0x30
[ 249.333019] </TASK>
[ 249.335236] INFO: task kworker/0:0:6 blocked for more than 123 seconds.
[ 249.341926] Not tainted 6.0.0-rc7+ #1
[ 249.346157] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.354062] task:kworker/0:0 state:I stack:0 pid:6 ppid:2 flags:0x00004000
[ 249.362506] Workqueue: 0x0 (rcu_par_gp)
[ 249.366471] Call Trace:
[ 249.368953] <TASK>
[ 249.371087] __schedule+0x38f/0x1490
[ 249.374724] schedule+0x5d/0xe0
[ 249.377897] worker_thread+0xbc/0x3f0
[ 249.381599] ? process_one_work+0x580/0x580
[ 249.385821] kthread+0xe6/0x110
[ 249.389009] ? kthread_complete_and_exit+0x20/0x20
[ 249.393851] ret_from_fork+0x22/0x30
[ 249.397489] </TASK>
[ 249.399713] INFO: task kworker/0:0H:7 blocked for more than 123 seconds.
[ 249.406479] Not tainted 6.0.0-rc7+ #1
[ 249.410710] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.418614] task:kworker/0:0H state:I stack:0 pid:7 ppid:2 flags:0x00004000
[ 249.427053] Workqueue: 0x0 (events_highpri)
[ 249.431608] Call Trace:
[ 249.434336] <TASK>
[ 249.436697] __schedule+0x38f/0x1490
[ 249.440554] schedule+0x5d/0xe0
[ 249.443952] worker_thread+0xbc/0x3f0
[ 249.447877] ? process_one_work+0x580/0x580
[ 249.452317] kthread+0xe6/0x110
[ 249.455716] ? kthread_complete_and_exit+0x20/0x20
[ 249.460779] ret_from_fork+0x22/0x30
[ 249.464632] </TASK>
[ 249.467064] INFO: task kworker/u64:0:8 blocked for more than 123 seconds.
[ 249.474146] Not tainted 6.0.0-rc7+ #1
[ 249.478601] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.486736] task:kworker/u64:0 state:I stack:0 pid:8 ppid:2 flags:0x00004000
[ 249.495407] Workqueue: 0x0 (scsi_tmf_1)
[ 249.499603] Call Trace:
[ 249.502340] <TASK>
[ 249.504699] __schedule+0x38f/0x1490
[ 249.508556] schedule+0x5d/0xe0
[ 249.511951] worker_thread+0xbc/0x3f0
[ 249.515876] ? process_one_work+0x580/0x580
[ 249.520321] kthread+0xe6/0x110
[ 249.523719] ? kthread_complete_and_exit+0x20/0x20
[ 249.528781] ret_from_fork+0x22/0x30
[ 249.532636] </TASK>
[ 249.535080] INFO: task kworker/0:1H:9 blocked for more than 123 seconds.
[ 249.542069] Not tainted 6.0.0-rc7+ #1
[ 249.546527] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.554665] task:kworker/0:1H state:I stack:0 pid:9 ppid:2 flags:0x00004000
[ 249.563331] Workqueue: 0x0 (kblockd)
[ 249.567268] Call Trace:
[ 249.569989] <TASK>
[ 249.572348] __schedule+0x38f/0x1490
[ 249.576205] schedule+0x5d/0xe0
[ 249.579607] worker_thread+0xbc/0x3f0
[ 249.583535] ? process_one_work+0x580/0x580
[ 249.587975] kthread+0xe6/0x110
[ 249.591371] ? kthread_complete_and_exit+0x20/0x20
[ 249.596430] ret_from_fork+0x22/0x30
[ 249.600289] </TASK>
[ 249.602726] INFO: task mm_percpu_wq:10 blocked for more than 123 seconds.
[ 249.609811] Not tainted 6.0.0-rc7+ #1
[ 249.614262] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.622398] task:mm_percpu_wq state:I stack:0 pid:10 ppid:2 flags:0x00004000
[ 249.631063] Call Trace:
[ 249.633781] <TASK>
[ 249.636142] __schedule+0x38f/0x1490
[ 249.640006] schedule+0x5d/0xe0
[ 249.643419] rescuer_thread+0x2f8/0x390
[ 249.647524] ? worker_thread+0x3f0/0x3f0
[ 249.651703] kthread+0xe6/0x110
[ 249.655105] ? kthread_complete_and_exit+0x20/0x20
[ 249.660167] ret_from_fork+0x22/0x30
[ 249.664033] </TASK>
[ 249.666489] INFO: task rcu_tasks_kthre:11 blocked for more than 123 seconds.
[ 249.673828] Not tainted 6.0.0-rc7+ #1
[ 249.678277] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.686413] task:rcu_tasks_kthre state:I stack:0 pid:11 ppid:2 flags:0x00004000
[ 249.695068] Call Trace:
[ 249.697802] <TASK>
[ 249.700161] __schedule+0x38f/0x1490
[ 249.704020] ? mark_held_locks+0x49/0x80
[ 249.708229] ? rcu_tasks_one_gp+0x3e0/0x3e0
[ 249.712728] schedule+0x5d/0xe0
[ 249.716133] rcu_tasks_one_gp+0x19e/0x3e0
[ 249.720428] ? rcu_tasks_one_gp+0x3e0/0x3e0
[ 249.724879] rcu_tasks_kthread+0x31/0x40
[ 249.729072] kthread+0xe6/0x110
[ 249.732482] ? kthread_complete_and_exit+0x20/0x20
[ 249.737565] ret_from_fork+0x22/0x30
[ 249.741429] </TASK>
[ 249.743865] INFO: task rcu_tasks_rude_:12 blocked for more than 123 seconds.
[ 249.751224] Not tainted 6.0.0-rc7+ #1
[ 249.755698] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 249.763861] task:rcu_tasks_rude_ state:I stack:0 pid:12 ppid:2 flags:0x00004000
[ 249.772515] Call Trace:
[ 249.775256] <TASK>
[ 249.777629] __schedule+0x38f/0x1490
[ 249.781482] ? mark_held_locks+0x49/0x80
[ 249.785667] ? rcu_tasks_one_gp+0x3e0/0x3e0
[ 249.790148] schedule+0x5d/0xe0
[ 249.793559] rcu_tasks_one_gp+0x19e/0x3e0
[ 249.797866] ? rcu_tasks_one_gp+0x3e0/0x3e0
[ 249.802315] rcu_tasks_kthread+0x31/0x40
[ 249.806515] kthread+0xe6/0x110
[ 249.809945] ? kthread_complete_and_exit+0x20/0x20
[ 249.815007] ret_from_fork+0x22/0x30
[ 249.818904] </TASK>
[ 249.821366]
Showing all locks held in the system:
[ 249.828044] 1 lock held by rcu_tasks_kthre/11:
[ 249.832767] #0: ffffffff8273bdf0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2b/0x3e0
[ 249.842684] 1 lock held by rcu_tasks_rude_/12:
[ 249.847389] #0: ffffffff8273bb70 (rcu_tasks_rude.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x2b/0x3e0
[ 249.857732] 1 lock held by khungtaskd/56:
[ 249.862000] #0: ffffffff8273c800 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0x16b
[ 249.871288] 1 lock held by in:imklog/1289:
[ 249.875633] #0: ffff888100f309a8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x65/0xb0
[ 249.885886] =============================================
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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