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: 36d, last: 14d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in kernel_restart				9	219d	304d	0/17	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 5.11.0-rc1-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-shutdow state:D stack:22904 pid:    1 ppid:     0 flags:0x00000000
Call Trace:
 context_switch kernel/sched/core.c:4313 [inline]
 __schedule+0x91b/0x1f90 kernel/sched/core.c:5064
 schedule+0xcb/0x270 kernel/sched/core.c:5143
 wait_for_device_probe+0x1be/0x220 drivers/base/dd.c:709
 device_shutdown+0x18/0x5c0 drivers/base/core.c:4162
 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/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fcf108c28c6
RSP: 002b:00007fff6c083c18 EFLAGS: 00000206 ORIG_RAX: 00000000000000a9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fcf108c28c6
RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead
RBP: 00007fff6c083ca8 R08: 0000000000002800 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00005608061ff150 R15: 00007fff6c083f98

Showing all locks held in the system:
1 lock held by systemd-shutdow/1:
 #0: ffffffff87352ec8 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a3/0x3e0 kernel/reboot.c:346
1 lock held by khungtaskd/1258:
 #0: ffffffff87478220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6254
5 locks held by kworker/0:2/1178:
 #0: ffff888103fad538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888103fad538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888103fad538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888103fad538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888103fad538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888103fad538 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x871/0x1580 kernel/workqueue.c:2246
 #1: ffffc90014747da8 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1580 kernel/workqueue.c:2250
 #2: ffff888109209218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline]
 #2: ffff888109209218 (&dev->mutex){....}-{3:3}, at: hub_event+0x1c5/0x42d0 drivers/usb/core/hub.c:5537
 #3: ffff888108da2218 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline]
 #3: ffff888108da2218 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:894
 #4: ffff88810804e1a8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:725 [inline]
 #4: ffff88810804e1a8 (&dev->mutex){....}-{3:3}, at: __device_attach+0x7a/0x4a0 drivers/base/dd.c:894

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

NMI backtrace for cpu 1
CPU: 1 PID: 1258 Comm: khungtaskd Not tainted 5.11.0-rc1-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+0x107/0x163 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:296
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline]
NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline]
NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1c9/0x250 drivers/acpi/processor_idle.c:516

Crashes (50):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
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	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/10 19:24	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	2c1f2513	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/10 09:24	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	2c1f2513	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/10 00:56	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	2c1f2513	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/09 13:22	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	a6c52263	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/09 08:43	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/08 11:44	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/08 09:04	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/08 08:21	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	841081d8	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/07 10:33	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/07 07:13	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/07 05:50	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/07 02:09	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	c104d4a3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/06 22:42	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	fff20c29	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/06 18:10	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	fff20c29	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/06 15:46	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	fff20c29	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/06 09:24	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	b1c228e1	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/06 03:33	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	b1c228e1	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/05 23:55	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	b1c228e1	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/05 21:08	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	a0234d98	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/05 19:36	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	ed054e4e	a0234d98	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
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	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/05 00:03	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	8280de6a	2a28ff1f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/04 23:06	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	8280de6a	2a28ff1f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/04 15:16	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/04 01:48	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/03 23:32	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/03 15:11	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/03 14:59	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/02 02:33	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/01 13:18	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/01 10:55	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2021/01/01 01:27	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/31 18:28	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	79264ae3	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/30 16:03	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	ecb8c012	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/30 06:12	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	cb4d9b52	0fa352f2	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/28 00:08	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	f838f8d2	2242f77f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/27 18:31	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	f838f8d2	2242f77f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/27 17:06	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	f838f8d2	2242f77f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/27 00:22	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	821e0b09	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/26 19:14	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	821e0b09	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/26 07:19	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	821e0b09	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/25 23:46	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	821e0b09	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/25 16:12	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	b982b3ea	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/25 03:50	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	c2c1d1dd	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-usb	2020/12/24 21:32	https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing	3644e2d2	c2c1d1dd	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
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	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org