------------[ cut here ]------------
WARNING: CPU: 1 PID: 23553 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x167/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:97
Modules linked in:
CPU: 1 UID: 0 PID: 23553 Comm: syz.4.4494 Not tainted 6.16.0-rc1-syzkaller-00003-gf09079bd04a9 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:vkms_get_vblank_timestamp+0x167/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:97
Code: b7 fb e8 4c 08 a5 fb 4c 89 e1 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 43 49 89 04 24 eb c0 e8 8a 9b b7 fb 90 <0f> 0b 90 eb b5 e8 ef 58 1e fc e9 dc fe ff ff e8 75 59 1e fc e9 14
RSP: 0018:ffffc9000b69f0e0 EFLAGS: 00010283
RAX: 00000000000083a7 RBX: ffff88801ff1c028 RCX: ffffc90015962000
RDX: 0000000000080000 RSI: ffffffff86048126 RDI: 0000000000000006
RBP: 000001857fae91fa R08: 0000000000000006 R09: 000001857fae91fa
R10: 000001857fae91fa R11: 0000000000000001 R12: ffffc9000b69f248
R13: 000001857fae91fa R14: 0000000000004e20 R15: ffffffff86047fc0
FS:  00007fc5cf1d36c0(0000) GS:ffff888124854000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5cf1d1f00 CR3: 000000004a4d3000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp+0x102/0x1b0 drivers/gpu/drm/drm_vblank.c:879
 drm_crtc_next_vblank_start+0x182/0x300 drivers/gpu/drm/drm_vblank.c:1013
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1596 [inline]
 drm_atomic_helper_wait_for_fences+0x203/0x830 drivers/gpu/drm/drm_atomic_helper.c:1643
 commit_tail+0x83/0x400 drivers/gpu/drm/drm_atomic_helper.c:1857
 drm_atomic_helper_commit+0x2fd/0x380 drivers/gpu/drm/drm_atomic_helper.c:2111
 drm_atomic_commit+0x234/0x300 drivers/gpu/drm/drm_atomic.c:1577
 drm_client_modeset_commit_atomic+0x69d/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1101
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1204
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1387 [inline]
 drm_fb_helper_pan_display+0x32d/0xa40 drivers/gpu/drm/drm_fb_helper.c:1447
 fb_pan_display+0x479/0x7d0 drivers/video/fbdev/core/fbmem.c:193
 bit_update_start+0x49/0x1f0 drivers/video/fbdev/core/bitblit.c:380
 fbcon_switch+0xbf8/0x14c0 drivers/video/fbdev/core/fbcon.c:2192
 flush_scrollback drivers/tty/vt/vt.c:909 [inline]
 csi_J+0x863/0xad0 drivers/tty/vt/vt.c:1524
 csi_ECMA drivers/tty/vt/vt.c:2495 [inline]
 do_con_trol drivers/tty/vt/vt.c:2678 [inline]
 do_con_write+0x41d7/0x8280 drivers/tty/vt/vt.c:3174
 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3516
 process_output_block drivers/tty/n_tty.c:561 [inline]
 n_tty_write+0x40f/0x1160 drivers/tty/n_tty.c:2377
 iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
 file_tty_write.constprop.0+0x504/0x9b0 drivers/tty/tty_io.c:1081
 new_sync_write fs/read_write.c:593 [inline]
 vfs_write+0x6c7/0x1150 fs/read_write.c:686
 ksys_write+0x12a/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc5d178e929
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:00007fc5cf1d3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fc5d19b6240 RCX: 00007fc5d178e929
RDX: 0000000000000375 RSI: 0000200000001040 RDI: 0000000000000008
RBP: 00007fc5d1810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc5d19b6240 R15: 00007ffe0b16b2a8
 </TASK>