------------[ cut here ]------------
WARNING: CPU: 0 PID: 4875 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Modules linked in:
CPU: 0 PID: 4875 Comm: syz-executor.3 Not tainted 6.8.0-rc4-syzkaller-00410-gc02197fc9076 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 00 74 08 48 89 ef e8 0d 96 2d fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 2f c5 ce fb 90 <0f> 0b 90 eb e0 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 74 fe ff ff 48
RSP: 0018:ffffc90013766d40 EFLAGS: 00010287
RAX: ffffffff85c4a5c1 RBX: 000001f9dbe306e0 RCX: 0000000000040000
RDX: ffffc9000b309000 RSI: 00000000000034ec RDI: 00000000000034ed
RBP: ffffc90013766ee0 R08: ffffffff85c4a529 R09: 0000000000000000
R10: ffffc90003c12000 R11: ffffffff85c4a3f0 R12: 000001f9dbe306e0
R13: 1ffff920026ecddc R14: 0000000000000000 R15: ffff88801fa60000
FS:  00007fa78f9366c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020009000 CR3: 000000002f03c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:867 [inline]
 drm_crtc_next_vblank_start+0x22d/0x480 drivers/gpu/drm/drm_vblank.c:1002
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1557 [inline]
 drm_atomic_helper_wait_for_fences+0x277/0x8d0 drivers/gpu/drm/drm_atomic_helper.c:1604
 drm_atomic_helper_commit+0x53a/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2033
 drm_atomic_commit+0x27d/0x2d0 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1051
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1154
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1370 [inline]
 drm_fb_helper_pan_display+0x379/0xc10 drivers/gpu/drm/drm_fb_helper.c:1430
 fb_pan_display+0x3a3/0x680 drivers/video/fbdev/core/fbmem.c:191
 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:390
 fbcon_switch+0x1317/0x1ef0 drivers/video/fbdev/core/fbcon.c:2169
 flush_scrollback drivers/tty/vt/vt.c:912 [inline]
 csi_J+0x7b4/0xff0 drivers/tty/vt/vt.c:1527
 do_con_trol drivers/tty/vt/vt.c:2408 [inline]
 do_con_write+0x4d73/0x7820 drivers/tty/vt/vt.c:2905
 con_write+0x26/0x40 drivers/tty/vt/vt.c:3251
 process_output_block drivers/tty/n_tty.c:574 [inline]
 n_tty_write+0xd69/0x1230 drivers/tty/n_tty.c:2379
 iterate_tty_write drivers/tty/tty_io.c:1021 [inline]
 file_tty_write+0x54f/0x9b0 drivers/tty/tty_io.c:1096
 call_write_iter include/linux/fs.h:2085 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa81/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xf9/0x240
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fa78ec7dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa78f9360c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa78edac050 RCX: 00007fa78ec7dda9
RDX: 0000000000001006 RSI: 0000000020001040 RDI: 0000000000000005
RBP: 00007fa78ecca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fa78edac050 R15: 00007ffdb1e56098
 </TASK>