------------[ cut here ]------------
WARNING: CPU: 1 PID: 13249 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1dc/0x250 drivers/gpu/drm/vkms/vkms_crtc.c:103
Modules linked in:
CPU: 1 PID: 13249 Comm: syz-executor.3 Not tainted 6.8.0-rc4-syzkaller-00014-g7e90b5c295ec #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:vkms_get_vblank_timestamp+0x1dc/0x250 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 07 fc e8 27 6b f6 fb 4c 89 e1 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 67 49 89 04 24 eb c0 e8 f5 86 07 fc 90 <0f> 0b 90 eb b5 e8 1a af 60 fc e9 d8 fe ff ff e8 70 af 60 fc e9 6a
RSP: 0018:ffffc900137f7558 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000028b36ed8e98 RCX: ffffffff8583c6af
RDX: ffff88802b06bb80 RSI: ffffffff8583c72b RDI: 0000000000000006
RBP: ffff88801faa8000 R08: 0000000000000006 R09: 0000028b36ed8e98
R10: 0000028b36ed8e98 R11: 0000000000000000 R12: ffffc900137f76c0
R13: 0000028b36ed8e98 R14: 0000000000004e20 R15: ffffffff8583c550
FS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000001e8e2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp+0x103/0x1b0 drivers/gpu/drm/drm_vblank.c:867
 drm_crtc_next_vblank_start+0x186/0x300 drivers/gpu/drm/drm_vblank.c:1002
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1557 [inline]
 drm_atomic_helper_wait_for_fences+0x1fc/0x840 drivers/gpu/drm/drm_atomic_helper.c:1604
 drm_atomic_helper_commit+0x1cf/0x380 drivers/gpu/drm/drm_atomic_helper.c:2033
 drm_atomic_commit+0x20b/0x2e0 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x6c6/0x810 drivers/gpu/drm/drm_client_modeset.c:1051
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1154
 drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1180
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline]
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:230 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline]
 drm_fb_helper_lastclose+0xc7/0x160 drivers/gpu/drm/drm_fb_helper.c:2005
 drm_fbdev_generic_client_restore+0x2c/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258
 drm_client_dev_restore+0x188/0x2a0 drivers/gpu/drm/drm_client.c:247
 drm_release+0x32f/0x3e0 drivers/gpu/drm/drm_file.c:437
 __fput+0x270/0xb80 fs/file_table.c:376
 task_work_run+0x14f/0x250 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa8a/0x2ad0 kernel/exit.c:871
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 get_signal+0x23b9/0x2790 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
 </TASK>