INFO: task syz.5.1822:24190 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.5.1822      state:D stack:26624 pid:24190 tgid:24189 ppid:16599  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_timeout+0xc0/0x2c0
 __down_common+0x3b7/0x850
 down+0x80/0xd0
 console_lock+0x58/0x90
 con_install+0x97/0x770
 tty_init_dev+0xd7/0x4d0
 tty_open+0x7d9/0xcc0
 chrdev_open+0x4d9/0x600
 do_dentry_open+0x816/0x1380
 vfs_open+0x3b/0x340
 path_openat+0x2e44/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f20b215e90e
RSP: 002b:00007f20b03f5b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f20b03f66c0 RCX: 00007f20b215e90e
RDX: 0000000000000002 RSI: 00007f20b03f5c00 RDI: ffffffffffffff9c
RBP: 00007f20b2235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f20b2426038 R14: 00007f20b2425fa0 R15: 00007ffe71440948
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/1:2/33:
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5426:
 #0: ffff8881103300a0 (&tty->ldisc_sem
){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034732e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
6 locks held by syz.6.1769/23921:
2 locks held by syz.5.1822/24190:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
 #1: ffff88816e3571b0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_init_dev+0x74/0x4d0
1 lock held by syz.9.1928/25555:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
1 lock held by syz.7.1934/25575:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: ptmx_open+0xdc/0x2e0
1 lock held by syz.7.1934/25577:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
1 lock held by syz.3.2092/27608:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: ptmx_open+0xdc/0x2e0
1 lock held by syz.1.2140/28602:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
1 lock held by syz.6.2237/29653:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0
4 locks held by udevd/29805:
 #0: ffff88818bf74998 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xa4/0xca0
 #1: ffff8881835f5880 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x5d/0x420
 #2: ffff88811b77cb48 (kn->active#29){++++}-{0:0}, at: kernfs_seq_start+0xb2/0x420
 #3: ffff8881958771d8 (&dev->mutex){....}-{4:4}, at: manufacturer_show+0x26/0xa0
1 lock held by syz.5.2300/30332:
 #0: ffffffff8f456c80 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x204/0xcc0

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

NMI backtrace for cpu 1
CPU: 1 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+0x17a/0x380
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 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: 23921 Comm: syz.6.1769 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
RIP: 0010:memcpy_toio+0x7c/0xe0
Code: 02 40 0f 94 c5 31 ff e8 a2 f0 b4 fc b0 01 48 83 fb 02 73 4f 84 c0 74 51 e8 b1 eb b4 fc 48 89 d9 48 c1 e9 02 4c 89 fe 4c 89 f7 <f3> a5 f6 c3 02 74 02 66 a5 f6 c3 01 74 01 a4 5b 41 5e 41 5f 5d e9
RSP: 0018:ffffc90004e56de8 EFLAGS: 00010206
RAX: ffffffff8511fc2f RBX: 0000000000001400 RCX: 000000000000029d
RDX: ffffc9002c86e000 RSI: ffffc900049dc98c RDI: ffffc900050eb98c
RBP: 0000000000001401 R08: ffffc90004e56fd0 R09: 0000000000000001
R10: ffffc90004e56ff9 R11: fffff520009cae00 R12: ffff88816be1c058
R13: ffffc900050eb000 R14: ffffc900050eb000 R15: ffffc900049dc000
FS:  00007f0b1a8286c0(0000) GS:ffff88818d95d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4cea0d28 CR3: 00000001736d0000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 drm_fb_memcpy+0x325/0x5d0
 bochs_primary_plane_helper_atomic_update+0x361/0xa30
 drm_atomic_helper_commit_planes+0x626/0xea0
 drm_atomic_helper_commit_tail+0x60/0x510
 commit_tail+0x2b1/0x3c0
 drm_atomic_helper_commit+0xa77/0xb10
 drm_atomic_commit+0x24e/0x2b0
 drm_client_modeset_commit_atomic+0x660/0x7e0
 drm_client_modeset_commit_locked+0xcb/0x4d0
 drm_fb_helper_pan_display+0x3e9/0xbe0
 fb_pan_display+0x3a3/0x6a0
 fb_set_var+0x812/0xf90
 fbcon_resize+0xbdb/0x1580
 vc_do_resize+0x2d7/0x1550
 vt_resize+0x81/0xd0
 tiocswinsz+0x104/0x160
 tty_ioctl+0x225/0xdd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b1999e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0b1a828028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0b19c25fa0 RCX: 00007f0b1999e0d9
RDX: 0000200000000040 RSI: 0000000000005414 RDI: 0000000000000004
RBP: 00007f0b19a35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b19c26038 R14: 00007f0b19c25fa0 R15: 00007ffeeb369ca8
 </TASK>
