------------[ cut here ]------------
WARNING: CPU: 0 PID: 6400 at drivers/gpu/drm/vkms/vkms_crtc.c:100 vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:100
Modules linked in:
CPU: 0 UID: 0 PID: 6400 Comm: syz.3.96 Not tainted 6.12.0-rc6-syzkaller-00077-g2e1b3cc9d7f7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:100
Code: 42 80 3c 30 00 74 08 48 89 ef e8 68 34 0f fc 48 89 5d 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 ee 90 a8 fb 90 <0f> 0b 90 eb e4 89 d9 80 e1 07 38 c1 0f 8c cd fe ff ff 48 89 df e8
RSP: 0018:ffffc900049ef228 EFLAGS: 00010293
RAX: ffffffff85ec4912 RBX: 0000001d198de264 RCX: ffff8880737dbc00
RDX: 0000000000000000 RSI: 0000001d198de264 RDI: 0000001d198de264
RBP: ffffc900049ef3c0 R08: ffffffff85ec487f R09: 1ffffffff2852f0a
R10: dffffc0000000000 R11: ffffffff85ec4790 R12: 0000001d198de264
R13: ffff888142f09950 R14: 1ffff9200093de78 R15: ffff8880248e4000
FS:  00007f9bf79b36c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c00256c000 CR3: 0000000035048000 CR4: 00000000003526f0
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:878 [inline]
 drm_crtc_next_vblank_start+0x229/0x490 drivers/gpu/drm/drm_vblank.c:1012
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1558 [inline]
 drm_atomic_helper_wait_for_fences+0x277/0x8e0 drivers/gpu/drm/drm_atomic_helper.c:1605
 commit_tail+0x75/0x3c0 drivers/gpu/drm/drm_atomic_helper.c:1819
 drm_atomic_helper_commit+0x953/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2073
 drm_atomic_commit+0x296/0x2f0 drivers/gpu/drm/drm_atomic.c:1516
 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1068
 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1171
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1371 [inline]
 drm_fb_helper_pan_display+0x379/0xc10 drivers/gpu/drm/drm_fb_helper.c:1431
 fb_pan_display+0x3a3/0x680 drivers/video/fbdev/core/fbmem.c:191
 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:381
 fbcon_switch+0x144b/0x2250 drivers/video/fbdev/core/fbcon.c:2186
 redraw_screen+0x546/0xe90 drivers/tty/vt/vt.c:957
 do_fb_ioctl+0x71b/0x7b0 drivers/video/fbdev/core/fb_chrdev.c:92
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9bf6b7e719
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:00007f9bf79b3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9bf6d36058 RCX: 00007f9bf6b7e719
RDX: 0000000020000100 RSI: 0000000000004601 RDI: 0000000000000009
RBP: 00007f9bf6bf139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9bf6d36058 R15: 00007ffd827a7db8
 </TASK>