INFO: task syz-executor:9631 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21416 pid:9631  tgid:9631  ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 sync_inodes_sb+0x1bb/0xa10
 sync_filesystem+0x17a/0x230
 generic_shutdown_super+0x6f/0x2c0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x425/0x4c0
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xe9/0x130
 do_syscall_64+0x2bd/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f39fa990af7
RSP: 002b:00007ffed91d0e28 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000064 RCX: 00007f39fa990af7
RDX: 0000000000000200 RSI: 0000000000000009 RDI: 00007ffed91d1fd0
RBP: 00007f39fa9ee72f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000202 R12: 00007ffed91d1fd0
R13: 00007f39fa9ee72f R14: 00005555861e84a8 R15: 00007ffed91d30a0
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/35:
 #0: ffffffff8df3d6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u9:4/1090:
2 locks held by getty/5637:
 #0: ffff8881757820a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
3 locks held by kworker/1:5/6171:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900047a7ba0 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f2cc708 (rtnl_mutex){+.+.}-{4:4}, at: switchdev_deferred_process_work+0xe/0x20
3 locks held by kworker/1:6/6172:
 #0: ffff888100075948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90004757ba0 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8881a749d240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1f7/0x3b0
2 locks held by syz-executor/9631:
 #0: ffff8881744e60e0 (&type->s_umount_key#70){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff888109168820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x19f/0xa10
2 locks held by kworker/u9:15/9648:
2 locks held by segctord/10592:
2 locks held by syz-executor/10892:
 #0: ffff888104f580e0 (&type->s_umount_key#70){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffff8881090e6820 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x19f/0xa10
1 lock held by syz.3.1750/14314:
 #0: ffffffff8df43138 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x3b9/0x730
1 lock held by syz.0.1758/14329:
1 lock held by syz-executor/14328:
 #0: ffffffff8f2cc708 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x3b0/0x18b0

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 12750 Comm: segctord Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:update_rq_clock+0x100/0x5b0
Code: 8d 8b e8 0b 00 00 48 89 0c 24 48 c1 e9 03 48 89 4c 24 08 0f b6 04 29 84 c0 0f 85 48 03 00 00 8b bb e8 0b 00 00 e8 20 b0 09 00 <49> 89 c7 4c 8d a3 38 0b 00 00 4d 89 e6 49 c1 ee 03 41 80 3c 2e 00
RSP: 0000:ffffc900089d7998 EFLAGS: 00000046
RAX: 0000005ec77db5b9 RBX: ffff88812123a040 RCX: 43e25889a9970400
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200113af24 R12: ffff88812123a040
R13: 1ffff110242475ce R14: ffff88812123ab70 R15: 1ffff1102424756e
FS:  0000000000000000(0000) GS:ffff88818eb36000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78c3bf8580 CR3: 000000000dd38000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 try_to_wake_up+0x70d/0x12b0
 nilfs_segctor_wakeup+0x213/0x340
 nilfs_segctor_construct+0x472/0x690
 nilfs_segctor_thread+0x6f7/0xe00
 kthread+0x711/0x8a0
 ret_from_fork+0x4bc/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
