INFO: task syz.7.103:6810 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.103       state:D stack:27160 pid:6810  tgid:6809  ppid:6377   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x61e/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x290
 __se_sys_quotactl+0x382/0x990
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f61eb79acb9
RSP: 002b:00007f61ec6c2028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f61eba15fa0 RCX: 00007f61eb79acb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80000101
RBP: 00007f61eb808bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f61eba16038 R14: 00007f61eba15fa0 R15: 00007ffcd3757598
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8e35a360 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5636:
 #0: ffff8881764ff0a0 (&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
3 locks held by syz-executor/5813:
1 lock held by syz.7.103/6810:
 #0: ffff88816ad080e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/7090:
1 lock held by syz-executor/8850:
 #0: ffff88811197a0e0 (&type->s_umount_key#85){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
2 locks held by syz.3.553/10193:
1 lock held by syz.0.554/10196:
2 locks held by syz.6.555/10198:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 10196 Comm: syz.0.554 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:sync_regs+0xf/0x30
Code: 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 40 d6 48 89 fe 65 48 8b 3d 11 13 57 07 <48> 81 c7 58 ff ff ff 48 39 f7 74 0a ba a8 00 00 00 e9 6b 63 00 00
RSP: 0000:fffffe0000049f50 EFLAGS: 00000006
RAX: 0000000114776000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: fffffe0000049f58 RDI: ffffc90007687ff0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007fd43dc636c0(0000) GS:ffff8882a9926000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd432dd6000 CR3: 0000000114776000 CR4: 00000000000006f0
Call Trace:
 <ENTRY_TRAMPOLINE>
 asm_exc_page_fault+0xd/0x30
RIP: 7880:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 2530:0000000000000102 EFLAGS: 00000001
 </ENTRY_TRAMPOLINE>
