INFO: task hung in kernel

INFO: task hung in kernel_restart (2)
Status: upstream: reported on 2021/01/05 16:38
Reported-by: syzbot+495c6e4e8a6a71122a88@syzkaller.appspotmail.com
First crash: 116d, last: 27d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in kernel_restart				9	299d	384d	0/22	auto-closed as invalid on 2020/09/18 01:21

Sample crash report:

INFO: task systemd-shutdow:1 blocked for more than 143 seconds.
      Not tainted 5.12.0-rc3-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-shutdow state:D stack:23032 pid:    1 ppid:     0 flags:0x00000000
Call Trace:
 context_switch kernel/sched/core.c:4322 [inline]
 __schedule+0x91b/0x1f90 kernel/sched/core.c:5073
 schedule+0xcb/0x270 kernel/sched/core.c:5152
 wait_for_device_probe+0x1be/0x220 drivers/base/dd.c:704
 device_shutdown+0x18/0x5c0 drivers/base/core.c:4313
 kernel_restart_prepare kernel/reboot.c:76 [inline]
 kernel_restart+0x61/0xa0 kernel/reboot.c:246
 __do_sys_reboot+0x31e/0x3e0 kernel/reboot.c:349
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fec0dee88c6
RSP: 002b:00007ffe4d704db8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fec0dee88c6
RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead
RBP: 00007ffe4d704e48 R08: 0000000000002800 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 000055635a9d3150 R15: 00007ffe4d705138

Showing all locks held in the system:
1 lock held by systemd-shutdow/1:
 #0: ffffffff87952ca8 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a3/0x3e0 kernel/reboot.c:346
1 lock held by khungtaskd/1275:
 #0: ffffffff87a783e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6327
5 locks held by kworker/1:7/22471:
 #0: ffff888103f0f938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888103f0f938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888103f0f938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888103f0f938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888103f0f938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888103f0f938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1580 kernel/workqueue.c:2246
 #1: ffffc90011367da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1580 kernel/workqueue.c:2250
 #2: ffff888108fe4218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline]
 #2: ffff888108fe4218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c1/0x4320 drivers/usb/core/hub.c:5537
 #3: ffff88810d88e218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline]
 #3: ffff88810d88e218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:889
 #4: ffff8881105f41a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:740 [inline]
 #4: ffff8881105f41a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:889

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1275 Comm: khungtaskd Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x143/0x1db lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x46/0xe0 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1da/0x200 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd32/0xf70 kernel/hung_task.c:294
 kthread+0x38c/0x460 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:516

Crashes (117):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-usb	2021/03/18 19:54	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	18106234	7216542e	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/03/12 17:03	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	14b02f02	429d8a6b	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/03/08 03:28	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	5e17812c	09fbf400	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/03/07 18:37	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	5e17812c	c599ed12	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/03/05 04:29	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	5e17812c	f89ed068	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/03/02 15:40	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	5bb9cdb3	92ead296	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/03/02 03:24	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	fe07bfda	183afb6c	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/27 18:32	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3fb6d0e0	4c37c133	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/27 16:06	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3fb6d0e0	4c37c133	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/27 03:19	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	2c87f7a3	4c37c133	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/26 14:27	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	2c87f7a3	4c37c133	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/25 15:08	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	29c395c7	76f7fc95	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/25 03:21	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3b9cdafb	fcc6d71b	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/24 10:21	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3b9cdafb	fcc6d71b	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/23 15:44	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3b9cdafb	fcc6d71b	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/23 10:53	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3b9cdafb	fcc6d71b	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/22 11:09	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	31caf8b2	a659b3f1	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/22 06:34	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	55f62bc8	a659b3f1	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/21 06:49	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	3e5ed8b4	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/20 10:17	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	3e5ed8b4	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/20 04:43	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	f689d40a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/20 01:13	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	f689d40a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/19 23:34	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	f689d40a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/19 20:12	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	f689d40a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/19 18:17	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	f689d40a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/19 15:33	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	f689d40a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/19 05:11	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	14052202	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/18 05:58	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	14052202	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/18 02:45	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	14052202	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/17 10:01	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	052f8d9f	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/13 02:50	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	b5a12546	98682e5e	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/11 03:49	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	1ebe718b	a52ee10a	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/10 15:01	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	43861d29	9c8b8541	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/10 02:55	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	0a25669b	2bd9619f	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/09 20:46	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	4b049f55	2bd9619f	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/08 06:55	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	8cf9045b	2ce644fc	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/06 10:15	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	23e32a59	23a562df	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/05 19:51	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	23e32a59	23a562df	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/05 13:34	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	23e32a59	23a562df	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/04 22:02	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	2a1673f0	42b90a7c	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/04 15:18	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	2a1673f0	42b90a7c	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/04 10:13	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	d021e069	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/03 21:34	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	0e1d6f55	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/03 18:23	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	0e1d6f55	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/03 16:04	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	0e1d6f55	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/03 11:34	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	64eaa0fa	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/03 05:54	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	64eaa0fa	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/02/03 00:08	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	64eaa0fa	624dad51	.config	log	report	info	INFO: task hung in kernel_restart
ci2-upstream-usb	2021/01/11 06:40	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	2c1f2513	.config	log	report	info
ci2-upstream-usb	2021/01/05 07:39	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	8280de6a	2a28ff1f	.config	log	report	info
ci2-upstream-usb	2020/12/20 06:53	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	04201c06	.config	log	report	info