------------[ cut here ]------------
WARNING: CPU: 0 PID: 17551 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97
Modules linked in:
CPU: 0 UID: 0 PID: 17551 Comm: syz.5.2530 Not tainted 6.16.0-rc7-syzkaller-00105-g2942242dde89 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97
Code: 42 80 3c 28 00 74 08 48 89 df e8 b4 eb 33 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 db f2 21 fb cc e8 aa d8 d1 fb 90 <0f> 0b 90 eb e3 44 89 e1 80 e1 07 38 c1 0f 8c ff fe ff ff 4c 89 e7
RSP: 0018:ffffc9001de2f0c8 EFLAGS: 00010283
RAX: ffffffff85ee4e36 RBX: ffffc9001de2f240 RCX: 0000000000080000
RDX: ffffc90013652000 RSI: 00000000000045e2 RDI: 00000000000045e3
RBP: 1ffff92003bc5e48 R08: ffffffff8fa1ddf7 R09: 1ffffffff1f43bbe
R10: dffffc0000000000 R11: ffffffff85ee4d00 R12: 0000010fb341f435
R13: dffffc0000000000 R14: ffff888024a30028 R15: 0000010fb341f435
FS:  00007f14ecd446c0(0000) GS:ffff888125c23000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001900 CR3: 0000000078a7a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:879 [inline]
 drm_crtc_next_vblank_start+0x226/0x470 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+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1643
 commit_tail+0x79/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:1857
 drm_atomic_helper_commit+0xa6b/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2111
 drm_atomic_commit+0x262/0x2c0 drivers/gpu/drm/drm_atomic.c:1577
 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1101
 drm_client_modeset_dpms+0x17f/0x8c0 drivers/gpu/drm/drm_client_modeset.c:1283
 drm_fb_helper_dpms drivers/gpu/drm/drm_fb_helper.c:312 [inline]
 drm_fb_helper_blank+0xf5/0x140 drivers/gpu/drm/drm_fb_helper.c:-1
 fb_blank+0xd0/0x220 drivers/video/fbdev/core/fbmem.c:396
 fbcon_blank+0x4e6/0xbf0 drivers/video/fbdev/core/fbcon.c:2252
 do_unblank_screen+0x327/0x8b0 drivers/tty/vt/vt.c:4645
 vc_selection drivers/tty/vt/selection.c:344 [inline]
 set_selection_kernel+0xa8/0x17a0 drivers/tty/vt/selection.c:382
 set_selection_user+0xf0/0x140 drivers/tty/vt/selection.c:208
 vt_ioctl+0x81a/0x1f00 drivers/tty/vt/vt_ioctl.c:761
 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 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: 0033:0x7f14ebf8e9a9
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:00007f14ecd44038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f14ec1b6080 RCX: 00007f14ebf8e9a9
RDX: 0000200000001900 RSI: 000000000000541c RDI: 0000000000000006
RBP: 00007f14ec010d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f14ec1b6080 R15: 00007ffe246e1268
 </TASK>