INFO: task syz.8.6281:2839 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.6281      state:D stack:27040 pid:2839  tgid:2838  ppid:31591  task_flags:0x400140 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: 0033:0x7fe68079c819
RSP: 002b:00007fe6815ff028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fe680a15fa0 RCX: 00007fe68079c819
RDX: 0000000000000000 RSI: 0000200000005bc0 RDI: ffffffff80000800
RBP: 00007fe680832c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe680a16038 R14: 00007fe680a15fa0 R15: 00007ffcc78030c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/1:3/5276:
 #0: ffff888168698d48 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90003197c40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88810a3e11e0 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30
 #3: ffff8882276d31e0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
 #4: ffff8882355c91a8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x88/0x450
2 locks held by getty/5637:
 #0: ffff8881099000a0 (&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
2 locks held by syz-executor/26593:
4 locks held by udevd/30403:
 #0: ffff88801b297790 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xb7/0xe10
 #1: ffff88806d508488 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5c/0x420
 #2: ffff8882218165a8 (kn->active#21){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8882276d31e0 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
1 lock held by syz.8.6281/2839:
 #0: ffff888059bfc0e0 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.4.6560/3901:
 #0: ffff888059bfc0e0 (&type->s_umount_key#81){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.6865/5211:
 #0: ffffffff8e7648b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 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+0xfd9/0x1030
 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: 26593 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:match_held_lock+0x76/0xb0
Code: ff 1f 00 00 48 c7 c2 10 b4 c4 93 48 29 d0 48 c1 f8 03 48 ba 29 5c 8f c2 f5 28 5c 8f 48 0f af d0 bb 01 00 00 00 48 39 ca 74 02 <31> db 89 d8 5b 41 5e c3 cc cc cc cc cc 90 e8 77 6b fd f8 85 c0 74
RSP: 0018:ffffc90006bdf548 EFLAGS: 00000087
RAX: 0000000000000003 RBX: 0000000000000001 RCX: 0000000080000001
RDX: ffff88802ff61d40 RSI: ffff88801bc2e600 RDI: ffff88802ff628c0
RBP: 00000000ffffffff R08: ffff88801bc2e76b R09: 1ffff11003785ced
R10: dffffc0000000000 R11: ffffed1003785cee R12: 0000000000000246
R13: ffff88802ff61d40 R14: ffff88801bc2e600 R15: 0000000000000001
FS:  00005555615bc500(0000) GS:ffff88818de62000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3fcfdb CR3: 000000010f14a000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lock_is_held_type+0x89/0x150
 writeback_single_inode+0x325/0xdc0
 sync_inode_metadata+0x122/0x1d0
 f2fs_write_checkpoint+0xb93/0x26a0
 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: 0033:0x7f250079da57
Code: a2 c7 05 9c fc 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:00007ffdc5927cc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f2500832048 RCX: 00007f250079da57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdc5927d80
RBP: 00007ffdc5927d80 R08: 00007ffdc5928d80 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffdc5928e10
R13: 00007f2500832048 R14: 000000000012b509 R15: 00007ffdc5928e50
 </TASK>
