------------[ cut here ]------------
WARNING: CPU: 0 PID: 29324 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Modules linked in:
CPU: 0 PID: 29324 Comm: syz-executor.1 Not tainted 6.8.0-syzkaller-08073-g480e035fc4c7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:vkms_get_vblank_timestamp+0x1d2/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 00 74 08 48 89 ef e8 6d 69 22 fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 3f 19 bf fb 90 <0f> 0b 90 eb e0 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 74 fe ff ff 48
RSP: 0018:ffffc900039172a0 EFLAGS: 00010293
RAX: ffffffff85d5dc11 RBX: 000000c9375eec4c RCX: ffff88801c3d1e00
RDX: 0000000000000000 RSI: 000000c9375eec4c RDI: 000000c9375eec4c
RBP: ffffc90003917440 R08: ffffffff85d5db79 R09: 0000000000000000
R10: ffffc90004252000 R11: ffffffff85d5da40 R12: 000000c9375eec4c
R13: 1ffff92000722e88 R14: 0000000000000000 R15: ffff88801fd30000
FS:  0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2217fa8000 CR3: 0000000066b74000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:867 [inline]
 drm_crtc_next_vblank_start+0x22d/0x480 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+0x277/0x8d0 drivers/gpu/drm/drm_atomic_helper.c:1604
 drm_atomic_helper_commit+0x53a/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2033
 drm_atomic_commit+0x2ac/0x310 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1051
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1154
 drm_client_modeset_commit+0x4a/0x70 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:278 [inline]
 drm_fb_helper_lastclose+0xbb/0x180 drivers/gpu/drm/drm_fb_helper.c:2005
 drm_fbdev_generic_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258
 drm_client_dev_restore+0x132/0x270 drivers/gpu/drm/drm_client.c:247
 drm_lastclose drivers/gpu/drm/drm_file.c:406 [inline]
 drm_release+0x47c/0x560 drivers/gpu/drm/drm_file.c:437
 __fput+0x429/0x8a0 fs/file_table.c:422
 task_work_run+0x24f/0x310 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa1b/0x27e0 kernel/exit.c:878
 do_group_exit+0x207/0x2c0 kernel/exit.c:1027
 get_signal+0x176e/0x1850 kernel/signal.c:2907
 arch_do_signal_or_restart+0x96/0x860 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+0xc9/0x360 kernel/entry/common.c:212
 do_syscall_64+0x10a/0x240 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7fbfcd27de69
Code: Unable to access opcode bytes at 0x7fbfcd27de3f.
RSP: 002b:00007fbfcdfdc078 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: fffffffffffffffc RBX: 00007fbfcd3ac050 RCX: 00007fbfcd27de69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000020000
RBP: 00007fbfcd2ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 000000000000000b R14: 00007fbfcd3ac050 R15: 00007fbfcd4cfa48
 </TASK>