------------[ cut here ]------------
WARNING: CPU: 0 PID: 7488 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: 0 UID: 0 PID: 7488 Comm: syz.2.396 Not tainted 6.16.0-rc3-syzkaller-00116-ge34a79b96ab9 #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 1c ab a4 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 fa 42 b7 fb 90 <0f> 0b 90 eb b5 e8 5f 20 1e fc e9 dc fe ff ff e8 e5 20 1e fc e9 14
RSP: 0018:ffffc9000f636fc0 EFLAGS: 00010283
RAX: 00000000000056dc RBX: ffff888025d78028 RCX: ffffc9000dca9000
RDX: 0000000000080000 RSI: ffffffff8604dd76 RDI: 0000000000000006
RBP: 0000002a8822df03 R08: 0000000000000006 R09: 0000002a8822df03
R10: 0000002a8822df03 R11: 0000000000000001 R12: ffffc9000f637128
R13: 0000002a8822df03 R14: 0000000000004e20 R15: ffffffff8604dc10
FS:  00007f6e195a56c0(0000) GS:ffff888124752000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001900 CR3: 000000002cf88000 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
 redraw_screen+0x2c1/0x760 drivers/tty/vt/vt.c:965
 fbcon_blank+0x652/0xd20 drivers/video/fbdev/core/fbcon.c:2257
 do_unblank_screen+0x27b/0x4c0 drivers/tty/vt/vt.c:4645
 unblank_screen drivers/tty/vt/vt.c:4664 [inline]
 poke_blanked_console+0x24c/0x2d0 drivers/tty/vt/vt.c:4699
 vc_selection drivers/tty/vt/selection.c:344 [inline]
 set_selection_kernel+0xb8/0x14a0 drivers/tty/vt/selection.c:382
 set_selection_user+0xe8/0x140 drivers/tty/vt/selection.c:208
 tioclinux+0x2b1/0x640 drivers/tty/vt/vt.c:3430
 vt_ioctl+0x1fdf/0x30a0 drivers/tty/vt/vt_ioctl.c:761
 tty_ioctl+0x661/0x1640 drivers/tty/tty_io.c:2792
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893
 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: 0033:0x7f6e1878e929
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:00007f6e195a5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6e189b6080 RCX: 00007f6e1878e929
RDX: 0000200000001900 RSI: 000000000000541c RDI: 000000000000000a
RBP: 00007f6e18810b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6e189b6080 R15: 00007ffefce326f8
 </TASK>