------------[ cut here ]------------
WARNING: CPU: 1 PID: 8077 at drivers/gpu/drm/vkms/vkms_crtc.c:100 vkms_get_vblank_timestamp+0x15c/0x17c drivers/gpu/drm/vkms/vkms_crtc.c:100
Modules linked in:
CPU: 1 UID: 0 PID: 8077 Comm: syz.2.721 Not tainted 6.12.0-rc3-syzkaller-g6485cf5ea253 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : vkms_get_vblank_timestamp+0x15c/0x17c drivers/gpu/drm/vkms/vkms_crtc.c:100
lr : vkms_get_vblank_timestamp+0x15c/0x17c drivers/gpu/drm/vkms/vkms_crtc.c:100
sp : ffff80009a137280
x29: ffff80009a137280 x28: 0000000000004e20 x27: ffff80009a137350
x26: ffff80009a137340 x25: 0000000000000000 x24: 1ffff00013426e6a
x23: ffff0000c77a0000 x22: dfff800000000000 x21: 00000014ca290021
x20: 00000014ca290021 x19: ffff80009a137350 x18: 0000000000000000
x17: 0048000000000326 x16: ffff8000803609f4 x15: ffff700013426e64
x14: 1ffff00013426e64 x13: 0000000000000004 x12: ffff700013426e64
x11: ffff800083b133ec x10: 0000000000ff0100 x9 : 0000000000000000
x8 : ffff0000c967dac0 x7 : ffff800083b13ed0 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff80009a137350 x1 : 00000014ca290021 x0 : 00000014ca290021
Call trace:
 vkms_get_vblank_timestamp+0x15c/0x17c drivers/gpu/drm/vkms/vkms_crtc.c:100
 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline]
 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:897 [inline]
 drm_update_vblank_count+0x1fc/0xa5c drivers/gpu/drm/drm_vblank.c:311
 drm_vblank_disable_and_save+0xc8/0x324 drivers/gpu/drm/drm_vblank.c:480
 drm_crtc_vblank_off+0x258/0x7b8 drivers/gpu/drm/drm_vblank.c:1363
 vkms_crtc_atomic_disable+0x20/0x30 drivers/gpu/drm/vkms/vkms_crtc.c:230
 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1214 [inline]
 drm_atomic_helper_commit_modeset_disables+0xab0/0x15bc drivers/gpu/drm/drm_atomic_helper.c:1418
 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:1833
 drm_atomic_helper_commit+0x854/0x8d4 drivers/gpu/drm/drm_atomic_helper.c:2073
 drm_atomic_commit+0x264/0x2bc drivers/gpu/drm/drm_atomic.c:1516
 drm_client_modeset_commit_atomic+0x5a4/0x730 drivers/gpu/drm/drm_client_modeset.c:1068
 drm_client_modeset_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_client_modeset.c:1171
 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1197
 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:237 [inline]
 drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:264 [inline]
 drm_fb_helper_lastclose+0xc0/0x160 drivers/gpu/drm/drm_fb_helper.c:2003
 drm_fbdev_shmem_client_restore+0x3c/0x50 drivers/gpu/drm/drm_fbdev_shmem.c:229
 drm_client_dev_restore+0x12c/0x24c drivers/gpu/drm/drm_client.c:260
 drm_lastclose drivers/gpu/drm/drm_file.c:391 [inline]
 drm_release+0x330/0x3e8 drivers/gpu/drm/drm_file.c:424
 __fput+0x1bc/0x75c fs/file_table.c:431
 ____fput+0x20/0x30 fs/file_table.c:459
 task_work_run+0x230/0x2e0 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x178/0x1f4 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713
 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: 1064
hardirqs last  enabled at (1063): [<ffff80008a4398c4>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
hardirqs last  enabled at (1063): [<ffff80008a4398c4>] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:202
hardirqs last disabled at (1064): [<ffff80008a4396dc>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline]
hardirqs last disabled at (1064): [<ffff80008a4396dc>] _raw_spin_lock_irq+0x28/0x70 kernel/locking/spinlock.c:170
softirqs last  enabled at (962): [<ffff8000800307f8>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (960): [<ffff8000800307c4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---