INFO: task syz.5.998:15817 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.5.998       state:D stack:25288 pid:15817 tgid:15816 ppid:15160  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x1840/0x57a0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6ba/0x920
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x538/0x9d0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f30b9f9ce59
RSP: 002b:00007f30badda028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f30ba215fa0 RCX: 00007f30b9f9ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000802
RBP: 00007f30ba032e6f R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000002c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f30ba216038 R14: 00007f30ba215fa0 R15: 00007fff7688cbc8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95cc00 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5443:
 #0: ffff8881129180a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1380
2 locks held by syz-executor/6118:
1 lock held by syz.5.998/15817:
 #0: ffff88801f15a0d8 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.4.1519/22929:
1 lock held by syz.2.1522/22948:
 #0: ffff888113f69bb8 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1dd/0x4e0
2 locks held by syz.2.1522/22949:
2 locks held by syz.5.1523/22954:

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

NMI backtrace for cpu 0
CPU: 0 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+0xfd7/0x1030
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 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: 5558 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:__switch_to_asm+0x3a/0x70
Code: 00 48 8b a6 68 19 00 00 48 8b 9e 40 06 00 00 65 48 89 1d f9 9f 04 12 49 c7 c4 10 00 00 00 e8 01 00 00 00 cc e8 01 00 00 00 cc <48> 83 c4 10 49 ff cc 75 eb 0f ae e8 65 48 c7 05 c6 9f 04 12 ff ff
RSP: 0018:ffffc9000882e2b8 EFLAGS: 00000002
RAX: 0000000000000001 RBX: fc4cfd481ba57700 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffff88810d709dc0 RDI: ffff88810bced940
RBP: ffffc900067cfbd8 R08: 0000000000000000 R09: 1ffff110227ed8ea
R10: dffffc0000000000 R11: ffffed10227ed8eb R12: 0000000000000007
R13: dffffc0000000000 R14: ffff88810bced940 R15: ffff88810d70b3d0
FS:  000055556e6df540(0000) GS:ffff8882a92a4000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ea3dea2f8 CR3: 00000001057e6000 CR4: 00000000000006f0
Call Trace:
