INFO: task syz.6.2039:24674 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2039      state:D stack:26760 pid:24674 tgid:24673 ppid:20621  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x6d9/0x940
 down_read+0x99/0x2e0
 super_lock+0x2d6/0x3d0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x540/0x9e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f46b739cdd9
RSP: 002b:00007f46b55f6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f46b7615fa0 RCX: 00007f46b739cdd9
RDX: 0000000000000000 RSI: 00002000000003c0 RDI: ffffffff80000800
RBP: 00007f46b7432d69 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000000c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f46b7616038 R14: 00007f46b7615fa0 R15: 00007ffd05e55eb8
 </TASK>

Showing all locks held in the system:
1 lock held by ksoftirqd/0/15:
 #0: ffff88812103aea0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150
1 lock held by khungtaskd/35:
 #0: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5436:
 #0: ffff88816a0720a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/14974:
1 lock held by syz-executor/24582:
 #0: ffff88811bba00d8 (&type->s_umount_key#98){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
1 lock held by syz.6.2039/24674:
 #0: ffff8881b588c0d8 (&type->s_umount_key#56){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/26507:
 #0: ffff88811b2d20d8 (&type->s_umount_key#98){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7c40 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz-executor/31661:
 #0: ffff88810d34c0d8 (&type->s_umount_key#98){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
 #1: ffffffff8edf7c40 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520
2 locks held by syz.6.2304/32590:

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

NMI backtrace for cpu 1
CPU: 1 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+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: 1116 Comm: kworker/u9:8 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:__refill_objects_node+0x3aa/0x5c0
Code: c5 0f 92 c3 4d 85 e4 74 64 41 39 c5 73 5f 44 89 e8 48 ff c0 48 8b 74 24 18 48 8b 7c 24 38 4c 89 64 c7 f8 8b 4e 28 4a 8b 0c 21 <66> 90 4c 39 f8 0f 92 c3 41 ff c5 48 85 c9 74 3a 49 89 cc 4c 39 f8
RSP: 0018:ffffc9000763f780 EFLAGS: 00000203
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff88810a0bc000
RDX: 0000000800040002 RSI: ffff888100042140 RDI: ffff88810cdfba20
RBP: ffffc9000763f838 R08: ffffffff903097f7 R09: 1ffffffff20612fe
R10: dffffc0000000000 R11: fffffbfff20612ff R12: ffff88810a0ba000
R13: 0000000000000000 R14: ffffea0004282e10 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000016ad20000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 refill_objects+0x62/0x3d0
 __pcs_replace_empty_main+0x321/0x720
 __kmalloc_node_track_caller_noprof+0x572/0x7b0
 __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>
