INFO: task syz.9.952:13602 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.952       state:D stack:25464 pid:13602 tgid:13600 ppid:12007  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x883/0x1080
 down_write+0x1bc/0x200
 super_lock+0x289/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe29b9cdd9
RSP: 002b:00007efe2aa2d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007efe29e15fa0 RCX: 00007efe29b9cdd9
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: ffffffff80000201
RBP: 00007efe29c32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efe29e16038 R14: 00007efe29e15fa0 R15: 00007ffc1574d3b8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/36:
 #0: ffffffff8e95cda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5431:
 #0: ffff88816d66f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
3 locks held by syz-executor/8464:
3 locks held by syz-executor/12411:
1 lock held by syz.9.952/13602:
 #0: ffff8881a81640d8 (&type->s_umount_key#62){++++}-{4:4}, at: super_lock+0x289/0x3d0
2 locks held by syz-executor/13975:
1 lock held by syz.0.1201/15973:
1 lock held by syz.1.1205/15987:
 #0: ffff88810b64a0d8 (&type->s_umount_key#62){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz.8.1208/15997:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 36 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+0xfd3/0x1030
 kthread+0x388/0x470
 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: 52 Comm: kworker/u9:2 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
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:lock_release+0x2d7/0x3c0
Code: 63 97 11 00 00 00 00 eb b5 e8 45 53 06 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 35 1e 97 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 da 47 09 0a cc 48 8d 3d 72 3a 92
RSP: 0018:ffffc90000bc78f8 EFLAGS: 00000282
RAX: 866eb758af722800 RBX: 0000000000000202 RCX: 0000000080000002
RDX: 0000000000000004 RSI: ffffffff8e21c286 RDI: ffffffff8c28b4e0
RBP: ffff8881036ca9b0 R08: ffffffff82263d4c R09: ffff88812103f858
R10: dffffc0000000000 R11: fffffbfff206165f R12: 0000000000000004
R13: 0000000000000004 R14: ffff88812103f858 R15: ffff8881036c9d80
FS:  0000000000000000(0000) GS:ffff88818dc91000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34afaff8 CR3: 000000010d1f2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __kmalloc_node_track_caller_noprof+0x427/0x7b0
 __alloc_skb+0x2c1/0x7d0
 nsim_dev_trap_report_work+0x29a/0xb80
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
