INFO: task systemd-shutdow:1 blocked for more than 143 seconds.
      Not tainted 5.11.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:systemd-shutdow state:D stack:23024 pid:    1 ppid:     0 flags:0x00000000
Call Trace:
 context_switch kernel/sched/core.c:4324 [inline]
 __schedule+0x91b/0x1f90 kernel/sched/core.c:5075
 schedule+0xcb/0x270 kernel/sched/core.c:5154
 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/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fb6405188c6
RSP: 002b:00007ffedfc90498 EFLAGS: 00000202 ORIG_RAX: 00000000000000a9
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb6405188c6
RDX: 0000000001234567 RSI: 0000000028121969 RDI: fffffffffee1dead
RBP: 00007ffedfc90528 R08: 0000000000002800 R09: 0000000000000005
R10: 0000000000000002 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000558fba2e7150 R15: 00007ffedfc90818

Showing all locks held in the system:
1 lock held by systemd-shutdow/1:
 #0: ffffffff87952ae8 (system_transition_mutex){+.+.}-{3:3}, at: __do_sys_reboot+0x1a3/0x3e0 kernel/reboot.c:346
1 lock held by khungtaskd/1273:
 #0: ffffffff87a781a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6327
6 locks held by kworker/1:7/7890:

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

NMI backtrace for cpu 1
CPU: 1 PID: 1273 Comm: khungtaskd Not tainted 5.11.0-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+0xfa/0x151 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1513 Comm: kworker/0:2 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events_power_efficient gc_worker
RIP: 0010:test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
RIP: 0010:__lock_acquire+0xf4e/0x54c0 kernel/locking/lockdep.c:4870
Code: c7 c6 60 4d 07 86 48 c7 c7 60 21 07 86 e8 fa 9c 5b 04 0f 0b e9 2f fe ff ff 48 63 5c 24 18 be 08 00 00 00 48 8d 43 3f 48 85 db <48> 0f 49 c3 48 c1 f8 06 48 8d 3c c5 e0 96 1e 8a e8 2d 30 46 00 48
RSP: 0018:ffffc90004c57a78 EFLAGS: 00000006
RAX: 000000000000006a RBX: 000000000000002b RCX: 1ffffffff143d772
RDX: 0000000000000004 RSI: 0000000000000008 RDI: ffffffff8a1ebb90
RBP: ffff8881057d0970 R08: 0000000000000000 R09: ffffffff8a1e96e7
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8881057d0000
R13: 0000000000000004 R14: ffff8881057d0920 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8881f6a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffedfc8fb48 CR3: 0000000108d87000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire kernel/locking/lockdep.c:5510 [inline]
 lock_acquire+0x19d/0x6f0 kernel/locking/lockdep.c:5475
 rcu_lock_acquire include/linux/rcupdate.h:267 [inline]
 rcu_read_lock include/linux/rcupdate.h:656 [inline]
 gc_worker+0x13c/0xc50 net/netfilter/nf_conntrack_core.c:1372
 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x38c/0x460 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294