------------[ cut here ]------------
WARNING: CPU: 1 PID: 6504 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: 6504 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-09791-ge5eb28f6d1af #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
pstate: 804000c5 (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 : ffff80009ed07290
x29: ffff80009ed07290 x28: 0000000000004e20 x27: ffff80009ed07370
x26: ffff80009ed07360 x25: 1ffff00013da0e6e x24: 0000000000000000
x23: ffff0000c8bf4000 x22: dfff800000000000 x21: 0000000e8e6e0b81
x20: 0000000e8e6e0b81 x19: ffff80009ed07370 x18: ffff80009ed06b80
x17: 000000000001bc2f x16: ffff800080340de0 x15: ffff700013da0e68
x14: 1ffff00013da0e68 x13: 0000000000000004 x12: ffff700013da0e68
x11: ffff800083b6dc80 x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000cd621e40 x7 : ffff800083b6e764 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff80009ed07370 x1 : 0000000e8e6e0b81 x0 : 0000000e8e6e0b81
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:867 [inline]
 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:886 [inline]
 drm_update_vblank_count+0x1fc/0xa5c drivers/gpu/drm/drm_vblank.c:298
 drm_vblank_disable_and_save+0xc8/0x324 drivers/gpu/drm/drm_vblank.c:467
 drm_crtc_vblank_off+0x258/0x7b8 drivers/gpu/drm/drm_vblank.c:1351
 vkms_crtc_atomic_disable+0x20/0x30 drivers/gpu/drm/vkms/vkms_crtc.c:233
 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1213 [inline]
 drm_atomic_helper_commit_modeset_disables+0xab0/0x15bc drivers/gpu/drm/drm_atomic_helper.c:1417
 vkms_atomic_commit_tail+0x5c/0x20c drivers/gpu/drm/vkms/vkms_drv.c:71
 commit_tail+0x274/0x3b8 drivers/gpu/drm/drm_atomic_helper.c:1832
 drm_atomic_helper_commit+0x854/0x8d4 drivers/gpu/drm/drm_atomic_helper.c:2072
 drm_atomic_commit+0x274/0x2d0 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x5a4/0x730 drivers/gpu/drm/drm_client_modeset.c:1051
 drm_client_modeset_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_client_modeset.c:1154
 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1180
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline]
 drm_fb_helper_lastclose+0xc0/0x160 drivers/gpu/drm/drm_fb_helper.c:2005
 drm_fbdev_generic_client_restore+0x3c/0x50 drivers/gpu/drm/drm_fbdev_generic.c:258
 drm_client_dev_restore+0x12c/0x24c drivers/gpu/drm/drm_client.c:247
 drm_lastclose drivers/gpu/drm/drm_file.c:406 [inline]
 drm_release+0x4ac/0x504 drivers/gpu/drm/drm_file.c:437
 __fput+0x30c/0x738 fs/file_table.c:422
 __fput_sync+0x60/0x9c fs/file_table.c:507
 __do_sys_close fs/open.c:1556 [inline]
 __se_sys_close fs/open.c:1541 [inline]
 __arm64_sys_close+0x150/0x1e0 fs/open.c:1541
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
irq event stamp: 1878
hardirqs last  enabled at (1877): [<ffff80008a84694c>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
hardirqs last  enabled at (1877): [<ffff80008a84694c>] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:202
hardirqs last disabled at (1878): [<ffff80008a846764>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (1878): [<ffff80008a846764>] _raw_spin_lock_irq+0x28/0x70 kernel/locking/spinlock.c:170
softirqs last  enabled at (1740): [<ffff80008003172c>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (1738): [<ffff8000800316f8>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---