------------[ cut here ]------------
WARNING: CPU: 0 PID: 6007 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: 6007 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: events_unbound commit_work
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 04 3c 5f fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 c0 b6 88 05 cc e8 ea 85 f9 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:ffffc9000472f808 EFLAGS: 00010293
RAX: ffffffff85c6bde6 RBX: ffffc9000472f980 RCX: ffff888030ec3c80
RDX: 0000000000000000 RSI: 0000004d569c5ae1 RDI: 0000004d569c5ae1
RBP: 1ffff920008e5f30 R08: ffffffff8f9dfc77 R09: 1ffffffff1f3bf8e
R10: dffffc0000000000 R11: ffffffff85c6bcb0 R12: 0000004d569c5ae1
R13: dffffc0000000000 R14: ffff888024410028 R15: 0000004d569c5ae1
FS:  0000000000000000(0000) GS:ffff888125d0d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000080037018 CR3: 000000007d786000 CR4: 00000000003526f0
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:1718 [inline]
 drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1765
 commit_tail+0x79/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:1979
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>