------------[ cut here ]------------
WARNING: CPU: 1 PID: 10436 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: 10436 Comm: syz.4.1096 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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 a0 66 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 6a ea 00 fc 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:ffffc900043ff028 EFLAGS: 00010287
RAX: ffffffff85bf1a06 RBX: ffffc900043ff1a0 RCX: 0000000000080000
RDX: ffffc9000e5ea000 RSI: 0000000000000b9e RDI: 0000000000000b9f
RBP: 1ffff9200087fe34 R08: ffffc90003359000 R09: 0000000000000000
R10: ffffc90003359000 R11: ffffffff85bf18d0 R12: 00000082d7de0fd4
R13: dffffc0000000000 R14: ffff88801db8c028 R15: 00000082d7de0fd4
FS:  00007f905d23c6c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31516ff8 CR3: 00000000457a4000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 000000000000ffe6 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:879 [inline]
 drm_crtc_next_vblank_start+0x226/0x470 drivers/gpu/drm/drm_vblank.c:1013
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1718 [inline]
 drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1765
 drm_atomic_helper_commit+0x5c7/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2194
 drm_atomic_commit+0x262/0x2c0 drivers/gpu/drm/drm_atomic.c:1577
 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1103
 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1206
 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1232
 __drm_fb_helper_restore_fbdev_mode_unlocked+0x9d/0x1b0 drivers/gpu/drm/drm_fb_helper.c:238
 drm_fb_helper_set_par+0xaf/0x100 drivers/gpu/drm/drm_fb_helper.c:1360
 fb_set_var+0x82b/0xf50 drivers/video/fbdev/core/fbmem.c:319
 fbcon_resize+0xc51/0x1610 drivers/video/fbdev/core/fbcon.c:2082
 resize_screen drivers/tty/vt/vt.c:1121 [inline]
 vc_do_resize+0x535/0x1770 drivers/tty/vt/vt.c:1201
 vt_resize+0x81/0xd0 drivers/tty/vt/vt.c:1323
 tiocswinsz+0xfe/0x150 drivers/tty/tty_io.c:2367
 tty_ioctl+0x225/0xde0 drivers/tty/tty_io.c:2710
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f905c38efc9
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:00007f905d23c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f905c5e6180 RCX: 00007f905c38efc9
RDX: 0000200000000040 RSI: 0000000000005414 RDI: 000000000000000a
RBP: 00007f905c411f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f905c5e6218 R14: 00007f905c5e6180 R15: 00007f905c70fa28
 </TASK>