INFO: task syz.2.2348:11735 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.2348      state:D stack:28240 pid:11735 tgid:11734 ppid:5604   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x16e2/0x53f0
 schedule+0x164/0x360
 schedule_timeout+0xc0/0x2c0
 __down_common+0x2f1/0x710
 down+0x80/0xd0
 console_lock+0x58/0x90
 vt_ioctl+0x1cf1/0x20d0
 tty_ioctl+0x920/0xdd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab38f9e019
RSP: 002b:00007fab39e8e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fab39225fa0 RCX: 00007fab38f9e019
RDX: 0000200000000040 RSI: 0000000000005609 RDI: 0000000000000003
RBP: 00007fab3903500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fab39226038 R14: 00007fab39225fa0 R15: 00007fff2e61ba88
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75d000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5419:
 #0: ffff8881001f10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x13a0
4 locks held by syz-executor/5596:
3 locks held by kworker/0:4/5700:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #1: ffffc90006befc40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_scheduled_works+0x9bd/0x1470
 #2: ffff8881053fe280 (&helper->lock){+.+.}-{4:4}, at: drm_fb_helper_damage_work+0x11b/0x720
10 locks held by syz.4.2344/11727:
1 lock held by udevd/12219:
4 locks held by syz-executor/12319:
2 locks held by syz.5.3322/14209:
2 locks held by dhcpcd/14219:
 #0: ffff88811d5d6e08 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: sock_close+0x82/0x220
 #1: ffffffff8e7632b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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+0xf9e/0xff0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
