INFO: task syz.2.192:7534 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.192       state:D stack:24696 pid:7534  tgid:7533  ppid:7157   task_flags:0x400140 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: 0033:0x7f324cd9cdd9
RSP: 002b:00007f324dd28028 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f324d015fa0 RCX: 00007f324cd9cdd9
RDX: 0000000000000000 RSI: 0000200000005bc0 RDI: ffffffff80000800
RBP: 00007f324ce32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000140 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f324d016038 R14: 00007f324d015fa0 R15: 00007fffa9adb008
 </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 getty/5636:
 #0: ffff88810632a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900017682e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0
2 locks held by syz-executor/5817:
8 locks held by kworker/u8:2/5821:
 #0: ffff8881012b5940 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860
 #1: ffffc90004717c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860
 #2: ffffffff8fdca768 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffff888026b5d128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420
 #4: ffff888026b5e258 (&devlink->lock_key#19){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420
 #5: ffffffff8fdd9080 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x13a/0x830
 #6: ffff88810da94d88 (&dev_instance_lock_key#24){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x588/0x22c0
 #7: ffffffff8e962da8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.2.192/7534:
 #0: ffff8881784e20d8 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz.5.223/8016:
 #0: ffff8881784e20d8 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz-executor/10607:
1 lock held by syz.0.512/10614:

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

NMI backtrace for cpu 1
CPU: 1 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10607 Comm: syz-executor 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:arch_stack_walk+0xfb/0x150
Code: 48 8d bd 78 ff ff ff 4c 89 e6 4c 89 fa e8 2d 98 09 00 83 bd 78 ff ff ff 00 74 38 4c 8d bd 78 ff ff ff 4c 89 ff e8 95 6c 09 00 <48> 85 c0 74 24 48 89 df 48 89 c6 4d 89 f3 2e e8 b1 13 48 0a 84 c0
RSP: 0018:ffffc90003c872c8 EFLAGS: 00000246
RAX: ffffffff821e64fa RBX: ffffc90003c87380 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff8e23a96e RDI: ffffffff821e64fa
RBP: ffffc90003c87350 R08: ffffc90003c87bf8 R09: 0000000000000000
R10: ffffc90003c87318 R11: fffff52000790e65 R12: ffff8881b58a5880
R13: 1ffff11036b14bce R14: ffffffff81b04b10 R15: ffffc90003c872c8
FS:  000055558506c500(0000) GS:ffff88818dc3d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f557d203000 CR3: 000000010f40c000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __set_page_owner+0x8d/0x4c0
 post_alloc_hook+0x231/0x280
 get_page_from_freelist+0x24ba/0x2540
 __alloc_frozen_pages_noprof+0x18d/0x380
 __alloc_pages_noprof+0x10/0x100
 alloc_pages_bulk_noprof+0x5ff/0x7c0
 __kasan_populate_vmalloc+0xc1/0x1d0
 alloc_vmap_area+0xd47/0x1480
 __get_vm_area_node+0x1f8/0x300
 __vmalloc_node_range_noprof+0x36a/0x1750
 vmalloc_user_noprof+0xad/0xe0
 kcov_ioctl+0x55/0x620
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff9adb9ca6b
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fff7b98ed70 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000080000 RCX: 00007ff9adb9ca6b
RDX: 0000000000080000 RSI: ffffffff80086301 RDI: 00000000000000de
RBP: 00007ff9ade165d8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000003 R14: 00007fff7b98f028 R15: 0000000000000000
 </TASK>
