------------[ cut here ]------------
WARNING: CPU: 1 PID: 14025 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1cd/0x210
Modules linked in:
CPU: 1 PID: 14025 Comm: syz-executor.4 Not tainted 6.3.0-syzkaller-07919-g6e98b09da931 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:vkms_get_vblank_timestamp+0x1cd/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103
Code: 03 42 80 3c 28 00 74 08 48 89 ef e8 9d 24 95 fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a3 5a 3e fc <0f> 0b eb e6 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 7a fe ff ff 48 89
RSP: 0018:ffffc9000ba172c0 EFLAGS: 00010283
RAX: ffffffff854caf9d RBX: 00000229dc4d237e RCX: 0000000000040000
RDX: ffffc9000d857000 RSI: 0000000000005a0c RDI: 0000000000005a0d
RBP: ffffc9000ba17460 R08: ffffffff854caf09 R09: 0000000000000000
R10: ffffc900049d2000 R11: 0000000000000000 R12: 00000229dc4d237e
R13: 1ffff92001742e8c R14: 0000000000000000 R15: ffff88801e42c000
FS:  00007f313ed4c700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000203ae000 CR3: 00000000286c5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline]
 drm_crtc_next_vblank_start+0x229/0x460 drivers/gpu/drm/drm_vblank.c:1012
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1537 [inline]
 drm_atomic_helper_wait_for_fences+0x277/0x8d0 drivers/gpu/drm/drm_atomic_helper.c:1584
 drm_atomic_helper_commit+0x627/0xbc0 drivers/gpu/drm/drm_atomic_helper.c:2013
 drm_atomic_commit+0x279/0x2c0 drivers/gpu/drm/drm_atomic.c:1503
 drm_client_modeset_commit_atomic+0x676/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1045
 drm_client_modeset_commit_locked+0xe0/0x510 drivers/gpu/drm/drm_client_modeset.c:1148
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1718 [inline]
 drm_fb_helper_pan_display+0x379/0xc00 drivers/gpu/drm/drm_fb_helper.c:1778
 fb_pan_display+0x3b0/0x690 drivers/video/fbdev/core/fbmem.c:924
 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:387
 fbcon_switch+0x1514/0x2190 drivers/video/fbdev/core/fbcon.c:2169
 redraw_screen+0x53c/0xe70 drivers/tty/vt/vt.c:965
 do_fb_ioctl+0x815/0x8f0 drivers/video/fbdev/core/fbmem.c:1127
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f313e08c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f313ed4c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f313e1ac050 RCX: 00007f313e08c169
RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000006
RBP: 00007f313e0e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc19f112af R14: 00007f313ed4c300 R15: 0000000000022000
 </TASK>