------------[ cut here ]------------
WARNING: CPU: 1 PID: 16283 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: 16283 Comm: syz.3.2316 Not tainted 6.16.0-syzkaller-11743-g6bcdbd62bd56 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vkms_get_vblank_timestamp+0x167/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:97
Code: ad fb e8 4c d3 9a 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 9a 77 ad fb 90 <0f> 0b 90 eb b5 e8 cf cb 13 fc e9 dc fe ff ff e8 55 cc 13 fc e9 14
RSP: 0018:ffffc90005137050 EFLAGS: 00010283
RAX: 0000000000011ba8 RBX: ffff888142740028 RCX: ffffc900151af000
RDX: 0000000000080000 RSI: ffffffff860e1b86 RDI: 0000000000000006
RBP: 000000c88200c721 R08: 0000000000000006 R09: 000000c88200c721
R10: 000000c88200c721 R11: 0000000000000000 R12: ffffc900051371b8
R13: 000000c88200c721 R14: 0000000000004e20 R15: ffffffff860e1a20
FS:  00007ff5f8f676c0(0000) GS:ffff8881247c6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4363f4c8 CR3: 0000000073973000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp+0x105/0x1b0 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:1711 [inline]
 drm_atomic_helper_wait_for_fences+0x203/0x830 drivers/gpu/drm/drm_atomic_helper.c:1758
 drm_atomic_helper_commit+0x1cf/0x380 drivers/gpu/drm/drm_atomic_helper.c:2187
 drm_atomic_commit+0x231/0x300 drivers/gpu/drm/drm_atomic.c:1577
 drm_client_modeset_commit_atomic+0x69d/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1103
 drm_client_modeset_commit_locked+0x14d/0x580 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+0x32d/0xa40 drivers/gpu/drm/drm_fb_helper.c:1448
 fb_pan_display+0x479/0x7d0 drivers/video/fbdev/core/fbmem.c:193
 fb_set_var+0x847/0x1280 drivers/video/fbdev/core/fbmem.c:330
 fbcon_switch+0x4dc/0x14c0 drivers/video/fbdev/core/fbcon.c:2145
 redraw_screen+0x2c1/0x760 drivers/tty/vt/vt.c:965
 fbcon_modechanged+0x456/0x700 drivers/video/fbdev/core/fbcon.c:2709
 fbcon_update_vcs+0x42/0x50 drivers/video/fbdev/core/fbcon.c:2754
 do_fb_ioctl+0x787/0x7e0 drivers/video/fbdev/core/fb_chrdev.c:92
 fb_ioctl+0xe5/0x150 drivers/video/fbdev/core/fb_chrdev.c:169
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:598 [inline]
 __se_sys_ioctl fs/ioctl.c:584 [inline]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584
 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: 0033:0x7ff5f818eb69
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:00007ff5f8f67038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff5f83b6160 RCX: 00007ff5f818eb69
RDX: 0000200000000380 RSI: 0000000000004601 RDI: 0000000000000005
RBP: 00007ff5f8211df1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff5f83b6160 R15: 00007ffee0269588
 </TASK>