INFO: task kworker/0:0:9 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:20960 pid:9     tgid:9     ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events console_callback
Call Trace:
 <TASK>
 __schedule+0x17d4/0x5820
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 __down_common+0x3b7/0x850
 down+0x80/0xd0
 console_lock+0x58/0x90
 console_callback+0x69/0x450
 process_scheduled_works+0xc3d/0x1630
 worker_thread+0xa47/0xfb0
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
INFO: task syz.8.4142:16406 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.8.4142      state:D stack:28552 pid:16406 tgid:16405 ppid:14126  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d4/0x5820
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 __down_common+0x3b7/0x850
 down+0x80/0xd0
 console_lock+0x58/0x90
 vcs_open+0x61/0xd0
 chrdev_open+0x4d9/0x600
 do_dentry_open+0x816/0x1380
 vfs_open+0x3b/0x340
 path_openat+0x1443/0x1d60
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81d5d5e98e
RSP: 002b:00007f81d6c9bb28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f81d6c9c6c0 RCX: 00007f81d5d5e98e
RDX: 0000000000000102 RSI: 00007f81d6c9bc00 RDI: ffffffffffffff9c
RBP: 00007f81d6c9bc00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: cccccccccccccccd
R13: 00007f81d6026038 R14: 00007f81d6025fa0 R15: 00007ffd04a49878
 </TASK>

Showing all locks held in the system:
locks held by kworker/0:0/9: 2, on CPU#0:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc900000e7c40 (console_work){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by khungtaskd/35: 1, last CPU#0:
 #0: ffffffff8ed5c6a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5423: 2, on CPU#1:
 #0: ffff88816fd4a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000346e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by kworker/u9:12/8725: 2, on CPU#0:
 #0: ffff888109c28940 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90003177c40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
locks held by kworker/0:6/9615: 3, on CPU#0:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #1: ffffc90006fffc40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630
 #2: ffff88810b2d4a70 (&helper->lock){+.+.}-{4:4}, at: drm_fb_helper_damage_work+0x15b/0xf20
locks held by syz.1.3679/15224: 6, last CPU#0:
 #0: ffffffff8ed4e9e0 (console_lock){+.+.}-{0:0}, at: vt_resizex+0x2a6/0x570
 #1: ffff88810b2d4a70 (&helper->lock){+.+.}-{4:4}, at: drm_fb_helper_pan_display+0xbe/0xbe0
 #2: ffff8881605fc128 (&dev->master_mutex){+.+.}-{4:4}, at: drm_master_internal_acquire+0x20/0x80
 #3: ffff88810b2d4890 (&client->modeset_mutex){+.+.}-{4:4}, at: drm_client_modeset_commit_locked+0x4c/0x4d0
 #4: ffffc90004e674b0 (crtc_ww_class_acquire){+.+.}-{0:0}, at: drm_client_modeset_commit_atomic+0x11a/0x7e0
 #5: ffffc90004e674d8 (crtc_ww_class_mutex){+.+.}-{4:4}, at: drm_client_modeset_commit_atomic+0x11a/0x7e0
locks held by syz.7.4547/17561: 2, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
 #1: ffff8880377751b0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_init_dev+0x74/0x4d0
locks held by syz.9.4565/17690: 1, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
locks held by syz.9.4565/17693: 1, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
locks held by syz.5.4686/18234: 1, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
locks held by syz.2.4792/18547: 1, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
locks held by syz.4.4809/18649: 1, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
locks held by syz.4.4809/18652: 1, on CPU#0:
 #0: ffffffff8f673520 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
locks held by syz-executor/18706: 4, last CPU#0:
 #0: ffff88802bb84460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881177c44e0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
 #2: ffffffff8ee8f5e0 (fs_reclaim){+.+.}-{0:0}, at: kmem_cache_alloc_lru_noprof+0x65/0x5f0
 #3: ffffffff8eea4d40 (mmu_notifier_invalidate_range_start){+.+.}-{0:0}, at: fs_reclaim_acquire+0x7c/0x100

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 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+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
