------------[ cut here ]------------
WARNING: CPU: 0 PID: 6092 at ./include/linux/sched.h:2185 __clear_task_blocked_on include/linux/sched.h:2185 [inline]
WARNING: CPU: 0 PID: 6092 at ./include/linux/sched.h:2185 __ww_mutex_wound+0x21a/0x2b0 kernel/locking/ww_mutex.h:346
Modules linked in:
CPU: 0 UID: 0 PID: 6092 Comm: syz.0.32 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
RIP: 0010:__clear_task_blocked_on include/linux/sched.h:2185 [inline]
RIP: 0010:__ww_mutex_wound+0x21a/0x2b0 kernel/locking/ww_mutex.h:346
Code: 5f 5d c3 cc cc cc cc cc 90 0f 0b 90 e9 89 fe ff ff 90 0f 0b 90 e9 39 ff ff ff 90 0f 0b 90 4d 85 ff 0f 85 67 ff ff ff eb 95 90 <0f> 0b 90 eb 8f 48 c7 c1 70 ae a3 8f 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc90002bbed20 EFLAGS: 00010046
RAX: ffff888021b6cd00 RBX: dffffc0000000000 RCX: f27a7c3cd36bdb00
RDX: 00000000000002f4 RSI: ffffffff8dba5baf RDI: ffffffff8be33300
RBP: 0000000000000001 R08: ffff888021b6d3a7 R09: 1ffff1100436da74
R10: dffffc0000000000 R11: ffffed100436da75 R12: ffff88810be6e0b8
R13: ffffc90002bbf168 R14: ffff88810be6d640 R15: ffff888021b6d3a0
FS:  00007f3e2afac6c0(0000) GS:ffff8880b861c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002000 CR3: 000000010cb56000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 __ww_mutex_add_waiter kernel/locking/ww_mutex.h:574 [inline]
 __mutex_lock_common kernel/locking/mutex.c:638 [inline]
 __ww_mutex_lock+0xba3/0x2930 kernel/locking/mutex.c:767
 ww_mutex_lock+0x3f/0x1c0 kernel/locking/mutex.c:885
 modeset_lock+0x2be/0x650 drivers/gpu/drm/drm_modeset_lock.c:316
 drm_atomic_get_crtc_state+0x126/0x460 drivers/gpu/drm/drm_atomic.c:356
 drm_atomic_get_plane_state+0x4c8/0x5a0 drivers/gpu/drm/drm_atomic.c:561
 drm_client_modeset_commit_atomic+0x1e7/0x760 drivers/gpu/drm/drm_client_modeset.c:1055
 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1206
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1388 [inline]
 drm_fb_helper_pan_display+0x3e7/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1448
 fb_pan_display+0x39e/0x680 drivers/video/fbdev/core/fbmem.c:193
 bit_update_start+0x4d/0x1e0 drivers/video/fbdev/core/bitblit.c:380
 fbcon_switch+0x1568/0x2040 drivers/video/fbdev/core/fbcon.c:2206
 flush_scrollback drivers/tty/vt/vt.c:909 [inline]
 csi_J+0x6c4/0xe50 drivers/tty/vt/vt.c:1524
 do_con_trol drivers/tty/vt/vt.c:2678 [inline]
 do_con_write+0x4169/0x5200 drivers/tty/vt/vt.c:3174
 con_write+0x24/0x40 drivers/tty/vt/vt.c:3516
 process_output_block drivers/tty/n_tty.c:561 [inline]
 n_tty_write+0xd2c/0x1200 drivers/tty/n_tty.c:2377
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write+0x554/0xa20 drivers/tty/tty_io.c:1081
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x5c9/0xb30 fs/read_write.c:686
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e2a18ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3e2afac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3e2a3b5fa0 RCX: 00007f3e2a18ebe9
RDX: 0000000000001006 RSI: 0000200000001940 RDI: 0000000000000004
RBP: 00007f3e2a211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3e2a3b6038 R14: 00007f3e2a3b5fa0 R15: 00007ffc70561788
 </TASK>
