INFO: task syz.8.870:13572 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.870       state:D stack:27296 pid:13572 tgid:13571 ppid:11405  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f928619c799
RSP: 002b:00007f9287107028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f9286415fa0 RCX: 00007f928619c799
RDX: 00000000706d6174 RSI: 0000200000000000 RDI: ffffffff80000800
RBP: 00007f9286232c99 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000002c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9286416038 R14: 00007f9286415fa0 R15: 00007fff64dcd478
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/1:0/24:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/u10:6/151:
 #0: ffff88823c63ade0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
 #1: ffff88823c624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff8881b64d8788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xb4/0x4a0
 #3: ffffffff9a50adf8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580
 #4: 
ffff88823c624588 (psi_seq){-.-.}-{0:0}, at: unwind_next_frame+0xa5/0x23c0
2 locks held by getty/5634:
 #0: ffff88816b0130a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
6 locks held by kworker/u8:3/5841:
 #0: ffff8881012ae148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006c3fc40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbbf8b0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffff88816b4140e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x117/0x3f0
 #4: ffff88816b411250 (&devlink->lock_key#51){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x3f0
 #5: ffffffff8e764680 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580
2 locks held by syz-executor/6684:
1 lock held by syz.8.870/13572:
 #0: ffff88810e40e0e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.8.1121/16281:
 #0: ffff88810e40e0e0 (&type->s_umount_key#65){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by dhcpcd/17833:
 #0: ffff8881a9afe260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10
 #1: ffffffff8e7647b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by dhcpcd/17834:
 #0: ffff888171b16260 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x33/0xe10
4 locks held by dhcpcd-run-hook/17841:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6684 Comm: syz-executor 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:down_write+0x91/0x200
Code: c7 60 eb cc 8b be 35 06 00 00 e8 fa 05 e5 f5 2e 2e 2e 31 c0 48 8d 7b 70 31 f6 31 d2 31 c9 41 b8 01 00 00 00 45 31 c9 ff 75 08 <e8> ea 0b f1 f5 48 83 c4 08 bf 01 00 00 00 e8 dc 6c e3 f5 43 c6 44
RSP: 0018:ffffc90006a0f798 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88810a0c8380 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88810a0c83f0
RBP: ffffc90006a0f830 R08: 0000000000000001 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed1022a5d168 R12: 1ffff92000d41ef4
R13: dffffc0000000000 R14: ffffc90006a0f7c0 R15: dffffc0000000000
FS:  00005555929f6500(0000) GS:ffff8882a945d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555591dcfa28 CR3: 000000016fdf2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 f2fs_write_checkpoint+0x607/0x26a0
 kill_f2fs_super+0x314/0x720
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f225cf9d9d7
Code: a2 c7 05 1c fd 24 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:00007ffcb1090ec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f225d032050 RCX: 00007f225cf9d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffcb1090f80
RBP: 00007ffcb1090f80 R08: 00007ffcb1091f80 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcb1092010
R13: 00007f225d032050 R14: 000000000002c826 R15: 00007ffcb1092050
 </TASK>
