INFO: task syz.6.2204:23210 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2204      state:D stack:24696 pid:23210 tgid:23209 ppid:22883  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: 0033:0x7fa59879cdd9
RSP: 002b:00007fa599622028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007fa598a15fa0 RCX: 00007fa59879cdd9
RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000501
RBP: 00007fa598832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 00002000000043c0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa598a16038 R14: 00007fa598a15fa0 R15: 00007ffca7938c18
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by kworker/u9:5/154:
 #0: ffff8881000ac940 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90003307c40 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
3 locks held by dhcpcd/5552:
2 locks held by getty/5633:
 #0: ffff8881111540a0 (&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
3 locks held by kworker/0:9/7208:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc9000735fc40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffff888112a03230 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
2 locks held by syz-executor/17719:
2 locks held by syz-executor/17744:
1 lock held by syz.6.2204/23210:
 #0: ffff8881102620d8 (&type->s_umount_key#61){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.7.2289/23981:
 #0: ffff8881146220d8 (&type->s_umount_key#61){++++}-{4:4}, at: super_lock+0x289/0x3d0
1 lock held by syz-executor/25166:
 #0: ffffffff8e962da8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.8.2402/25289:
 #0: ffff8881102620d8 (&type->s_umount_key#61){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
2 locks held by syz-executor/25622:
3 locks held by dhcpcd-run-hook/25786:

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

NMI backtrace for cpu 0
CPU: 0 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+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfaa/0x1000
 kthread+0x388/0x470
 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: 1105 Comm: kworker/u10:8 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:unwind_next_frame+0x199/0x2550
Code: 44 24 38 0f b6 04 28 84 c0 0f 85 9c 1c 00 00 4c 89 6c 24 20 4c 89 7c 24 50 48 89 5c 24 18 0f b6 1b 48 8b 44 24 30 80 3c 28 00 <4c> 8b 7c 24 10 74 08 4c 89 ff e8 48 2b b9 00 4d 8b 27 48 83 f3 01
RSP: 0018:ffffc900074cf4b8 EFLAGS: 00000246
RAX: 1ffff92000e99eba RBX: 0000000000000000 RCX: 0000000080000002
RDX: 0000000073f0caf5 RSI: ffffffff8c282c60 RDI: ffffffff8c282c20
RBP: dffffc0000000000 R08: ffffffff817675a6 R09: ffffffff8e95caa0
R10: ffffc900074cf5d8 R11: ffffffff81b04f40 R12: ffffc900074cf5c0
R13: 1ffff92000e99eb1 R14: ffffc900074cf588 R15: ffffffff817675a6
FS:  0000000000000000(0000) GS:ffff8882a923d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4682dfc440 CR3: 0000000188e58000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x4db/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>
