------------[ cut here ]------------
WARNING: CPU: 1 PID: 8373 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97
Modules linked in:
CPU: 1 UID: 0 PID: 8373 Comm: syz.2.255 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97
lr : vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97
sp : ffff8000a50d7560
x29: ffff8000a50d7560 x28: 1fffe00018c45538 x27: ffff0000c622a880
x26: ffff8000a50d75a0 x25: 1ffff00014a1aeb4 x24: 1ffff00014a1aed8
x23: dfff800000000000 x22: 0000001088e8be15 x21: 0000001088e8be15
x20: ffff0000c97f0080 x19: ffff8000a50d76c0 x18: 00000000ffffffff
x17: 0048000000000326
 x16: ffff80008b007340 x15: 0000000000000002
x14: 1fffe0001eec0621 x13: 0000000000000000 x12: ffff80009ead9000
x11: ffff60001eec0623 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000d4950000 x7 : 0000000000000000 x6 : ffff80009ead9000
x5 : ffff0000f7603118 x4 : ffff0000f76030d8 x3 : 0000000000000000
x2 : ffff8000a50d76c0 x1 : 0000001088e8be15 x0 : 0000001088e8be15
Call trace:
 vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 (P)
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:879 [inline]
 drm_crtc_next_vblank_start+0x1b8/0x380 drivers/gpu/drm/drm_vblank.c:1013
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1711 [inline]
 drm_atomic_helper_wait_for_fences+0x1a0/0x78c drivers/gpu/drm/drm_atomic_helper.c:1758
 drm_atomic_helper_commit+0x4d0/0x8cc drivers/gpu/drm/drm_atomic_helper.c:2187
 drm_atomic_commit+0x204/0x25c drivers/gpu/drm/drm_atomic.c:1577
 drm_client_modeset_commit_atomic+0x524/0x6ac drivers/gpu/drm/drm_client_modeset.c:1103
 drm_client_modeset_commit_locked+0xd0/0x4a0 drivers/gpu/drm/drm_client_modeset.c:1206
 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1232
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:238 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:268 [inline]
 drm_fb_helper_lastclose+0x90/0x188 drivers/gpu/drm/drm_fb_helper.c:1986
 drm_fbdev_client_restore+0x3c/0x50 drivers/gpu/drm/clients/drm_fbdev_client.c:31
 drm_client_dev_restore+0x120/0x238 drivers/gpu/drm/drm_client_event.c:117
 drm_lastclose drivers/gpu/drm/drm_file.c:408 [inline]
 drm_release+0x2f8/0x3e0 drivers/gpu/drm/drm_file.c:441
 __fput+0x340/0x75c fs/file_table.c:468
 ____fput+0x20/0x58 fs/file_table.c:496
 task_work_run+0x1dc/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x174/0x1f4 arch/arm64/kernel/entry-common.c:155
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline]
 el0_svc+0xb8/0x180 arch/arm64/kernel/entry-common.c:880
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596
irq event stamp: 628
hardirqs last  enabled at (627): [<ffff80008b00487c>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:86 [inline]
hardirqs last  enabled at (627): [<ffff80008b00487c>] exit_to_kernel_mode+0xc0/0xf0 arch/arm64/kernel/entry-common.c:96
hardirqs last disabled at (628): [<ffff80008b001bfc>] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574
softirqs last  enabled at (622): [<ffff8000803d88a0>] softirq_handle_end kernel/softirq.c:425 [inline]
softirqs last  enabled at (622): [<ffff8000803d88a0>] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607
softirqs last disabled at (451): [<ffff800080022028>] __do_softirq+0x14/0x20 kernel/softirq.c:613
---[ end trace 0000000000000000 ]---