------------[ cut here ]------------
WARNING: CPU: 1 PID: 2230 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103
Modules linked in:
CPU: 1 PID: 2230 Comm: syz-executor.3 Not tainted 6.4.0-rc4-syzkaller-g908f31f2a05b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103
lr : vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103
sp : ffff800097557230
x29: ffff800097557230 x28: ffff0000c4bc7080 x27: 0000000000000000
x26: 1ffff00012eaae54 x25: 1ffff00012eaae78 x24: 0000000000000000
x23: ffff0000cc130000 x22: dfff800000000000 x21: 00000146a9321108
x20: 00000146a9321108 x19: ffff8000975573c0 x18: 0000000000000000
x17: 0000000000000000 x16: ffff80008a3811b0 x15: 0000000000000000
x14: 1ffff00011bd80ae x13: 0000000000000000 x12: ffff80009a349000
x11: 0000000000040000 x10: 000000000000212d x9 : ffff8000a13f6000
x8 : 000000000000212e x7 : 0000000000000000 x6 : ffff80009a349000
x5 : ffff0000d7a858e8 x4 : ffff0000d7a858a8 x3 : 0000000000000000
x2 : ffff8000975573c0 x1 : 00000146a9321108 x0 : 00000146a9321108
Call trace:
 vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline]
 drm_crtc_next_vblank_start+0x1d4/0x3e0 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+0x200/0x7c4 drivers/gpu/drm/drm_atomic_helper.c:1584
 drm_atomic_helper_commit+0x500/0x94c drivers/gpu/drm/drm_atomic_helper.c:2013
 drm_atomic_commit+0x24c/0x2a0 drivers/gpu/drm/drm_atomic.c:1503
 drm_client_modeset_commit_atomic+0x5a4/0x730 drivers/gpu/drm/drm_client_modeset.c:1045
 drm_client_modeset_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_client_modeset.c:1148
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1726 [inline]
 drm_fb_helper_pan_display+0x334/0xa90 drivers/gpu/drm/drm_fb_helper.c:1786
 fb_pan_display+0x2fc/0x574 drivers/video/fbdev/core/fbmem.c:924
 bit_update_start+0x4c/0x1e4 drivers/video/fbdev/core/bitblit.c:387
 fbcon_modechanged+0x9d8/0x1090 drivers/video/fbdev/core/fbcon.c:2700
 fbcon_update_vcs+0x3c/0x4c drivers/video/fbdev/core/fbcon.c:2749
 do_fb_ioctl+0xb40/0xe34 drivers/video/fbdev/core/fbmem.c:1127
 fb_ioctl+0xec/0x134 drivers/video/fbdev/core/fbmem.c:1204
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x244 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:191
 el0_svc+0x4c/0x160 arch/arm64/kernel/entry-common.c:647
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:665
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
irq event stamp: 178
hardirqs last  enabled at (177): [<ffff80008a4321bc>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (177): [<ffff80008a4321bc>] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (178): [<ffff80008a42fd04>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:407
softirqs last  enabled at (100): [<ffff80008003437c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (98): [<ffff800080034348>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---