INFO: task syz.9.916:13280 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.916       state:D stack:25504 pid:13280 tgid:13277 ppid:12784  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: 0033:0x7f12d479c819
RSP: 002b:00007f12d29ee028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f12d4a15fa0 RCX: 00007f12d479c819
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000900
RBP: 00007f12d4832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000240 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f12d4a16038 R14: 00007f12d4a15fa0 R15: 00007ffe2884ae08
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/36:
 #0: ffffffff8e75e620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5640:
 #0: ffff8881781ef0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
6 locks held by kworker/u8:4/6488:
 #0: ffff8881012ae148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90004037c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbc2f90 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffffffff8fbd1708 (rtnl_mutex){+.+.}-{4:4}, at: wg_netns_pre_exit+0x1c/0x200
 #4: ffff88816b785568 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_netns_pre_exit+0xb0/0x200
 #5: ffffffff8e7648b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
2 locks held by syz-executor/7459:
1 lock held by syz.9.916/13280:
 #0: ffff8881143a80e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by kworker/u10:1/13655:
 #0: ffff88823c63ade0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
1 lock held by syz.9.1104/15285:
 #0: ffff8881143a80e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/15872:
1 lock held by syz.6.1269/17071:
 #0: ffff8881143a80e0 (&type->s_umount_key#84){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.4.1293/17270:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 36 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: 17270 Comm: syz.4.1293 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:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d e4 ca 55 0c 48 89 de 5b e9 03 d8 5d 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 08 4b 56 11 65 8b 15 29 4b 56
RSP: 0018:ffffc90006f7f688 EFLAGS: 00000246
RAX: ffffffff8ba6fbb0 RBX: 0000000000000015 RCX: 0000000000000002
RDX: ffff8881737b9d40 RSI: 0000000000000015 RDI: 0000000000000015
RBP: dffffc0000000000 R08: ffffffff8ba6fa92 R09: ffff88823c639990
R10: ffff8881bbc876e0 R11: ffffffff81b0b740 R12: ffffffff8e1b5798
R13: 1ffff11037790ede R14: ffffffff8ba6fa92 R15: 0000000000000015
FS:  00007f94485fc6c0(0000) GS:ffff8882a9462000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94477863c0 CR3: 00000001a0786000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __radix_tree_preload+0x725/0x870
 add_free_nid+0x156/0xae0
 f2fs_build_free_nids+0xf6f/0x1810
 f2fs_fill_super+0x4951/0x7740
 get_tree_bdev_flags+0x431/0x4f0
 vfs_get_tree+0x92/0x2a0
 do_new_mount+0x341/0xd30
 __se_sys_mount+0x31d/0x420
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f944779da8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f94485fbe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f94485fbee0 RCX: 00007f944779da8a
RDX: 0000200000000000 RSI: 0000200000000040 RDI: 00007f94485fbea0
RBP: 0000200000000000 R08: 00007f94485fbee0 R09: 0000000000000008
R10: 0000000000000008 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f94485fbea0 R14: 0000000000005505 R15: 00002000000059c0
 </TASK>
