INFO: task syz.0.672:9404 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.672       state:D stack:25128 pid:9404  tgid:9402  ppid:8666   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd490f8ec29
RSP: 002b:00007fd48f1f6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fd4911d5fa0 RCX: 00007fd490f8ec29
RDX: 000000000000ee00 RSI: 0000200000000040 RDI: ffffffff80000800
RBP: 00007fd491011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd4911d6038 R14: 00007fd4911d5fa0 R15: 00007ffeb346c5c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8dd3aca0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
5 locks held by kworker/0:2/792:
 #0: ffff888104b97548 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000489fbc0 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff888021869198 (&dev->mutex){....}-{4:4}, at: hub_event+0x184/0x4a20
 #3: ffff88802186c518 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x21b8/0x4a20
 #4: ffff88801ea24d68 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x21e5/0x4a20
2 locks held by getty/5649:
 #0: ffff888024c580a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
4 locks held by syz-executor/5825:
2 locks held by syz-executor/6254:
2 locks held by syz.3.163/6672:
3 locks held by syz-executor/7069:
3 locks held by syz-executor/7546:
3 locks held by syz-executor/7669:
1 lock held by syz-executor/9393:
1 lock held by syz.0.672/9404:
 #0: ffff88803184e0e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.4.717/9656:
 #0: ffff8881097e80e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0

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

NMI backtrace for cpu 1
CPU: 1 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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 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: 9393 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:lock_is_held_type+0x125/0x190
Code: 16 00 00 b8 ff ff ff ff 65 0f c1 05 15 b7 14 07 83 f8 01 75 44 48 c7 04 24 00 00 00 00 9c 8f 04 24 f7 04 24 00 02 00 00 75 4c <41> f7 c4 00 02 00 00 74 01 fb 65 48 8b 05 99 76 14 07 48 3b 44 24
RSP: 0018:ffffc90002b2fb98 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: df081f8a174ab100
RDX: 0000000000000000 RSI: ffffffff8d71699d RDI: ffffffff8b9e6fe0
RBP: 00000000ffffffff R08: ffff8880298793d3 R09: 1ffff1100530f27a
R10: dffffc0000000000 R11: ffffed100530f27b R12: 0000000000000246
R13: ffff888131f11cc0 R14: ffffffff8dd3ad00 R15: 0000000000000000
FS:  0000555590f49500(0000) GS:ffff8880b8d7e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc593bd2fe0 CR3: 000000011f4a0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __might_resched+0xa6/0x610
 __dentry_kill+0x299/0x660
 dput+0x19f/0x2b0
 dcache_dir_close+0x38/0x50
 __fput+0x44c/0xa70
 fput_close_sync+0x119/0x200
 __x64_sys_close+0x7f/0x110
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f28a6f8d88a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 43 91 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 a3 91 02 00 8b 44 24
RSP: 002b:00007fff09363ab0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 0000000000000d9b RCX: 00007f28a6f8d88a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fff09363b80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fff09364c10
R13: 00007f28a7011c2d R14: 0000555590f494a8 R15: 0000000000000005
 </TASK>
