INFO: task syz.6.260:7742 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.260       state:D stack:23848 pid:7742  tgid:7741  ppid:6430   task_flags:0x400140 flags:0x00004006
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
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x353/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f431ef8ec29
RSP: 002b:00007f431fda3038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f431f1d5fa0 RCX: 00007f431ef8ec29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000100
RBP: 00007f431f011e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f431f1d6038 R14: 00007f431f1d5fa0 R15: 00007ffd60c4ab28
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e13a0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5679:
 #0: ffff8881106b70a0 (&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
2 locks held by syz-executor/5859:
2 locks held by syz-executor/5863:
2 locks held by syz-executor/6016:
1 lock held by syz.6.260/7742:
 #0: ffff888039cee0e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
4 locks held by syz-executor/8007:
1 lock held by syz.0.400/9024:
 #0: ffff888038e8e0e0 (&type->s_umount_key#66){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.2.472/9359:
 #0: ffff888039cee0e0 (&type->s_umount_key#66){++++}-{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: 9411 Comm: syz.1.486 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: 0033:0x7f1207e50b2b
Code: d1 fe 83 e1 01 44 09 e9 41 89 c9 41 29 d1 45 39 d1 7c 2c 01 d5 44 01 d2 83 e8 01 41 83 c0 01 44 8d 14 12 44 8d 2c 09 4d 89 f1 <eb> 93 0f 1f 00 5b b8 f6 ff ff ff 5d 41 5c 41 5d 41 5e c3 66 90 44
RSP: 002b:00007f12061ed470 EFLAGS: 00000202
RAX: 0000000000000003 RBX: 0000000000000010 RCX: 0000000000000005
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 00007f12061ed5e0
RBP: 0000000000000000 R08: 0000000000000004 R09: 00007f12061ed568
R10: 0000000000000000 R11: 00007f12061ed540 R12: 0000000000000006
R13: 000000000000000a R14: 00007f12061ed568 R15: 00007f12061ed5e0
FS:  00007f12061ee6c0 GS:  0000000000000000
