INFO: task syz.9.641:11243 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.641       state:D stack:24200 pid:11243 tgid:11242 ppid:10941  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_read_slowpath+0x5fd/0x8f0
 down_read+0x98/0x2e0
 super_lock+0x2a9/0x3b0
 user_get_super+0xc8/0x120
 __se_sys_quotactl+0x4da/0x950
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3741b8ebe9
RSP: 002b:00007f3742a3a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f3741db5fa0 RCX: 00007f3741b8ebe9
RDX: 0000000000000000 RSI: 0000200000000040 RDI: ffffffff80000701
RBP: 00007f3741c11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000280 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3741db6038 R14: 00007f3741db5fa0 R15: 00007ffc34f1d468
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u9:5/4362:
 #0: ffff88801a489148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc90007e27bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
2 locks held by dhcpcd/5594:
 #0: ffffffff8f51cd68 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x5ee/0x790
 #1: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: vlan_ioctl_handler+0xd0/0x650
2 locks held by getty/5673:
 #0: ffff88810a35b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
8 locks held by kworker/u8:2/5743:
 #0: ffff88801b2f7148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900030afbc0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffffffff8f52b9f0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf7/0x800
 #3: ffff88812b3ca0e8 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x10a/0x3d0
 #4: ffff8881095c7250 (&devlink->lock_key#35){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x11c/0x3d0
 #5: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0xe5/0x670
 #6: ffff8880365b4d30 (&dev_instance_lock_key#20){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x52f/0x1ff0
 #7: ffffffff8e13f978 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
4 locks held by syz-executor/8205:
1 lock held by syz.9.641/11243:
 #0: ffff888120a0c0e0 (&type->s_umount_key#75){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.9.973/14561:
 #0: ffff888120a0c0e0 (&type->s_umount_key#75){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
1 lock held by syz.1.977/14616:
 #0: ffff888120a0c0e0 (&type->s_umount_key#75){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
2 locks held by syz-executor/14942:
1 lock held by syz-executor/15471:
 #0: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70
2 locks held by syz-executor/15472:
 #0: ffffffff8fa58530 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x23/0x250
 #1: ffffffff8f538888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8db/0x1c70

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

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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf93/0xfe0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 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: 13970 Comm: kworker/u8:1 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: bat_events batadv_nc_worker
RIP: 0010:sized_strscpy+0x1d0/0x250
Code: 48 89 f8 48 c1 e8 03 80 3c 10 00 74 05 e8 38 94 ad f6 49 89 1c 2e f3 49 0f bc df 48 c1 eb 03 48 01 eb 48 89 d8 48 83 c4 08 5b <41> 5c 41 5d 41 5e 41 5f 5d e9 92 04 07 00 cc 48 b8 ff ff ff ff ff
RSP: 0018:ffffc9000435fa50 EFLAGS: 00000086
RAX: 000000000000000a RBX: ffff888021342978 RCX: fefefefefefefeff
RDX: dffffc0000000000 RSI: ffff888021342978 RDI: ffff888021342982
RBP: 0000000000000073 R08: ffffffff99d42383 R09: 1ffffffff33a8470
R10: dffffc0000000000 R11: fffffbfff33a8471 R12: 0000000000000001
R13: 6e6576655f746162 R14: ffff888026ceb480 R15: 000000000000000a
FS:  0000000000000000(0000) GS:ffff8880b861b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff90742fd8 CR3: 0000000035ed2000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 process_scheduled_works+0x666/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
