INFO: task syz.3.2008:14476 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.3.2008      state:D stack:24696 pid:14476 tgid:14475 ppid:12632  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f730699ce59
RSP: 002b:00007f7307856028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f7306c15fa0 RCX: 00007f730699ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000901
RBP: 00007f7306a32d6f R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7306c16038 R14: 00007f7306c15fa0 R15: 00007fff851130e8
 </TASK>
INFO: task syz.6.2047:14621 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.6.2047      state:D stack:24664 pid:14621 tgid:14620 ppid:13493  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __se_sys_quotactl+0x3a7/0x9e0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7faa5df9ce59
RSP: 002b:00007faa5edcb028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007faa5e215fa0 RCX: 00007faa5df9ce59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007faa5e032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faa5e216038 R14: 00007faa5e215fa0 R15: 00007ffee5e6ed78
 </TASK>

Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
 #0: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5440:
 #0: ffff88811797a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034832e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by kworker/u11:3/5628:
 #0: ffff8881ba315140 ((wq_completion)hci13){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc9000476fc40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff8881b6dd0ea0 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400
2 locks held by syz-executor/5629:
2 locks held by syz-executor/6057:
3 locks held by syz-executor/6907:
2 locks held by syz-executor/7671:
2 locks held by syz-executor/8232:
1 lock held by syz.3.2008/14476:
 #0: ffff8881b7a3c0d8 (&type->s_umount_key#91){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.6.2047/14621:
 #0: ffff8881103ba0d8 (&type->s_umount_key#91){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.9.2084/14898:
 #0: ffff8881103ba0d8 (&type->s_umount_key#91){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/15824:
 #0: ffffffff8e962fe8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.8.2365/16136:
 #0: ffff8881103ba0d8 (&type->s_umount_key#91){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.2550/16934:
 #0: ffff88811d825640 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: sock_close+0x9b/0x240
1 lock held by syz.5.2550/16944:
 #0: ffffffff8fdcb4e0 (bpf_dispatcher_xdp.mutex){+.+.}-{4:4}, at: bpf_dispatcher_change_prog+0xc6/0xd70
3 locks held by syz.4.2551/16936:

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

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+0xfd3/0x1030
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 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: 6057 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:__sanitizer_cov_trace_pc+0x0/0x70
Code: 89 fb e8 23 00 00 00 48 8b 3d 44 68 60 0c 48 89 de 5b e9 a3 05 60 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 28 58 72 11 65 8b 15 49 58 72
RSP: 0018:ffffc90007157590 EFLAGS: 00000246
RAX: ffffffff825244c4 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8881110e0000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff8881a0c89c9b R09: 1ffff11034191393
R10: dffffc0000000000 R11: ffffed1034191394 R12: 1ffff92000e2aec0
R13: ffff8881a0c89b20 R14: ffff8881a0c89aa0 R15: ffff8881a0c89b70
FS:  0000555571eb4500(0000) GS:ffff88818dc9f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9f94bea540 CR3: 000000011491e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 writeback_single_inode+0x135/0xdc0
 sync_inode_metadata+0x122/0x1d0
 f2fs_write_checkpoint+0xb93/0x26a0
 kill_f2fs_super+0x314/0x730
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0x193/0x680
 do_syscall_64+0x353/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f396279e097
Code: a2 c7 05 5c 06 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:00007fffd1817298 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f39628321ca RCX: 00007f396279e097
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffd1817350
RBP: 00007fffd1817350 R08: 00007fffd1818350 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffd18183e0
R13: 00007f39628321ca R14: 00000000000247b0 R15: 00007fffd1818420
 </TASK>
