------------[ cut here ]------------
WARNING: CPU: 1 PID: 6516 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: 1 UID: 0 PID: 6516 Comm: syz.4.148 Not tainted 6.15.0-syzkaller-02443-g015a99fa7665 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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 94 db 37 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0b 4a 25 fb cc e8 0a fa d4 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:ffffc9000eff6e08 EFLAGS: 00010293
RAX: ffffffff85eaf706 RBX: ffffc9000eff6f80 RCX: ffff88802f2f5a00
RDX: 0000000000000000 RSI: 000000268d9564fc RDI: 000000268d9564fc
RBP: 1ffff92001dfedf0 R08: ffff888034dbd117 R09: 1ffff110069b7a22
R10: dffffc0000000000 R11: ffffffff85eaf5d0 R12: 000000268d9564fc
R13: dffffc0000000000 R14: ffff888024b48028 R15: 000000268d9564fc
FS:  00007f2d40dda6c0(0000) GS:ffff888125d91000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8dc2133f98 CR3: 00000000288e6000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline]
 drm_crtc_next_vblank_start+0x226/0x470 drivers/gpu/drm/drm_vblank.c:1012
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1596 [inline]
 drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1643
 drm_atomic_helper_commit+0x5c7/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2072
 drm_atomic_commit+0x262/0x2c0 drivers/gpu/drm/drm_atomic.c:1518
 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1079
 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1182
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1387 [inline]
 drm_fb_helper_pan_display+0x3e7/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1447
 fb_pan_display+0x39e/0x680 drivers/video/fbdev/core/fbmem.c:191
 fb_set_var+0x84a/0xf60 drivers/video/fbdev/core/fbmem.c:323
 fbcon_resize+0xaf8/0x1480 drivers/video/fbdev/core/fbcon.c:2070
 resize_screen drivers/tty/vt/vt.c:1112 [inline]
 vc_do_resize+0x535/0x1770 drivers/tty/vt/vt.c:1192
 vt_resizex+0x3c0/0x550 drivers/tty/vt/vt_ioctl.c:717
 vt_ioctl+0x11c7/0x1d70 drivers/tty/vt/vt_ioctl.c:937
 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2802
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2d3ff8e969
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:00007f2d40dda038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2d401b5fa0 RCX: 00007f2d3ff8e969
RDX: 0000200000001080 RSI: 000000000000560a RDI: 0000000000000004
RBP: 00007f2d40010ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2d401b5fa0 R15: 00007ffe3e1fdb48
 </TASK>