INFO: task kworker/u8:3:9012 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:3    state:D stack:22800 pid:9012  tgid:9012  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: pm_fs_sync pm_fs_sync_work_fn
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61b/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x120/0x280
 ksys_sync+0xa0/0x120
 ksys_sync_helper+0x17/0xa0
 pm_fs_sync_work_fn+0xf/0x70
 process_scheduled_works+0xa2f/0x1470
 worker_thread+0xa44/0xfb0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e75d000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
1 lock held by udevd/5042:
 #0: ffff8881012c5188 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_dop_revalidate+0x9e/0x5e0
2 locks held by dhcpcd/5339:
 #0: ffff8880317b36f0 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xf4/0x7b0
 #1: ffffffff8fbe1f48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by getty/5421:
 #0: ffff888111afb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x13a0
3 locks held by kworker/u8:3/9012:
 #0: ffff888161ad4148 ((wq_completion)pm_fs_sync){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc9000833fc40 (pm_fs_sync_work){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffff8881ba8aa0e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by kworker/1:7/9178:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc900038a7c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffff8881aae7b240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1fd/0x3b0
4 locks held by syz-executor/18259:
3 locks held by syz.1.4760/27097:
 #0: ffff88803d29eef8 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x246/0x320
 #1: ffff888109888420 (sb_writers#47){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0
 #2: ffffffff8ea83468 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb6/0xd70
5 locks held by kworker/u8:5/30508:
1 lock held by syz.7.5696/30772:
 #0: ffff8881ba8aa0e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.2.5871/31730:
 #0: ffff8881ba8aa0e0 (&type->s_umount_key#78){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/32438:
 #0: ffffffff8fbd37d0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4e2/0x720
 #1: ffffffff8fbe1f48 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2da/0x810
3 locks held by syz.3.6024/32478:
 #0: ffffffff9011d4a0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8fbe1f48 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x89d/0x1bd0
 #2: ffffffff8e7632b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 35 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf9e/0xff0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 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: 18259 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:check_preemption_disabled+0x2a/0xe0
Code: 55 41 57 41 56 53 65 8b 05 47 12 6e 07 65 8b 0d 3c 12 6e 07 f7 c1 ff ff ff 7f 74 0c 5b 41 5e 41 5f 5d e9 59 cd 02 00 cc 9c 59 <f7> c1 00 02 00 00 74 ea 65 4c 8b 3d ee 11 6e 07 41 f6 47 2f 04 74
RSP: 0018:ffffc900040b7700 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8df0e827 RDI: ffffffff8c28ad40
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed102e327a2a R12: 0000000000000000
R13: ffff88817193c540 R14: 0000000000000000 R15: 0000000000000001
FS:  0000555560bcb500(0000) GS:ffff88818de52000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc529b1ee8 CR3: 0000000118396000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_acquire+0xb9/0x2e0
 down_write+0x96/0x200
 f2fs_write_checkpoint+0xa81/0x2810
 kill_f2fs_super+0x319/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x3d3/0x460
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x18d/0x5e0
 do_syscall_64+0x357/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f88f3d9f257
Code: a2 c7 05 9c 44 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffec41d1ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f88f3e3445c RCX: 00007f88f3d9f257
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffec41d1fb0
RBP: 00007ffec41d1fb0 R08: 00007ffec41d2fb0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffec41d3040
R13: 00007f88f3e3445c R14: 0000000000114a94 R15: 00007ffec41d3080
 </TASK>
