INFO: task syz.7.1869:10685 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.7.1869      state:D stack:28424 pid:10685 tgid:10684 ppid:10044  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
 set_selection_kernel+0x3c/0x17c0
 set_selection_user+0xf8/0x150
 vt_ioctl+0x83b/0x20d0
 tty_ioctl+0x920/0xdd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa03b9e0d9
RSP: 002b:00007ffa04a17028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffa03e25fa0 RCX: 00007ffa03b9e0d9
RDX: 0000200000001900 RSI: 000000000000541c RDI: 0000000000000003
RBP: 00007ffa03c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa03e26038 R14: 00007ffa03e25fa0 R15: 00007ffcfd46efa8
 </TASK>
INFO: task syz.7.1869:10689 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.7.1869      state:D stack:28808 pid:10689 tgid:10684 ppid:10044  task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17d9/0x56c0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7bf/0x1550
 set_selection_kernel+0x37/0x17c0
 set_selection_user+0xf8/0x150
 vt_ioctl+0x83b/0x20d0
 tty_ioctl+0x920/0xdd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffa03b9e0d9
RSP: 002b:00007ffa049f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffa03e26090 RCX: 00007ffa03b9e0d9
RDX: 0000200000000000 RSI: 000000000000541c RDI: 0000000000000003
RBP: 00007ffa03c35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa03e26128 R14: 00007ffa03e26090 R15: 00007ffcfd46efa8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/35:
 #0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:2/802:
 #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #1: ffffc900058a7c40 ((work_completion)(&helper->damage_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0
 #2: ffff88816bb78a70 (&helper->lock){+.+.}-{4:4}, at: drm_fb_helper_damage_work+0x15b/0xf20
2 locks held by getty/5428:
 #0: ffff88817557f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
4 locks held by syz.3.1329/9146:
 #0: ffff8881bac820a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffff8881bac82128 (&tty->atomic_write_lock){+.+.}-{4:4}, at: file_tty_write+0x1e4/0x9c0
 #2: ffff8881bac822c8 (&tty->termios_rwsem){++++}-{4:4}, at: n_tty_write+0x1f5/0x11e0
 #3: ffffc90003943370 (&ldata->output_lock){+.+.}-{4:4}, at: n_tty_write+0x66d/0x11e0
10 locks held by syz.4.1544/9718:
1 lock held by syz.7.1869/10685:
 #0: ffffffff8f45f5a0 (vc_sel.lock){+.+.}-{4:4}, at: set_selection_kernel+0x37/0x17c0
1 lock held by syz.7.1869/10689:
 #0: ffffffff8f45f5a0 (vc_sel.lock){+.+.}-{4:4}, at: set_selection_kernel+0x37/0x17c0
1 lock held by syz.2.1897/10755:
2 locks held by syz.3.3154/14158:

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

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: 9718 Comm: syz.4.1544 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 42 0e b5 fc b0 01 48 83 fb 02 73 4f 84 c0 74 51 e8 51 09 b5 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:ffffc900071eedc8 EFLAGS: 00010206
RAX: ffffffff8511e1ef RBX: 0000000000001400 RCX: 0000000000000390
RDX: ffffc9002c804000 RSI: ffffc900055799c0 RDI: ffffc900060d89c0
RBP: 0000000000001401 R08: ffffc900071eefb0 R09: 0000000000000001
R10: ffffc900071eefd9 R11: fffff52000e3ddfc R12: ffff88816bd9e258
R13: ffffc900060d8400 R14: ffffc900060d8400 R15: ffffc90005579400
FS:  00007f59f083c6c0(0000) GS:ffff88818d95c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000198 CR3: 000000001ca46000 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
 cw_update_start+0x86/0x260
 fbcon_switch+0x130e/0x20b0
 redraw_screen+0x57b/0x1020
 vc_do_resize+0xffc/0x1550
 fbcon_modechanged+0x6ed/0x1140
 rotate_all_store+0x539/0x630
 kernfs_fop_write_iter+0x3a4/0x540
 vfs_write+0x612/0xba0
 ksys_write+0x150/0x270
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f59ef99e0d9
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:00007f59f083c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f59efc25fa0 RCX: 00007f59ef99e0d9
RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003
RBP: 00007f59efa35024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f59efc26038 R14: 00007f59efc25fa0 R15: 00007ffc3b835e98
 </TASK>
