------------[ cut here ]------------ WARNING: CPU: 1 PID: 8631 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: 8631 Comm: syz-executor.4 Not tainted 6.1.81-syzkaller #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 : ffff80001f9a6fd0 x29: ffff80001f9a6fd0 x28: ffff80001f9a7090 x27: ffff0000cdca0ee8 x26: ffff80001f9a7080 x25: 1ffff00003f34e12 x24: 0000000000000000 x23: ffff0000cdca0000 x22: dfff800000000000 x21: 000000208e258589 x20: 000000208e258589 x19: ffff80001f9a7090 x18: ffff80001f9a69a0 x17: 0048000000000326 x16: ffff80000831d00c x15: 0000000000000000 x14: 1ffff00002b060b0 x13: dfff800000000000 x12: ffff700003f34e0c x11: 0000000000ff0100 x10: 0000000000000000 x9 : ffff80000ba4d394 x8 : ffff0000d6141bc0 x7 : ffff80000b894290 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff80001f9a7090 x1 : 000000208e258589 x0 : 000000208e258589 Call trace: vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:881 [inline] drm_update_vblank_count+0x23c/0xb24 drivers/gpu/drm/drm_vblank.c:303 drm_vblank_disable_and_save+0xc8/0x344 drivers/gpu/drm/drm_vblank.c:477 drm_crtc_vblank_off+0x258/0x7b8 drivers/gpu/drm/drm_vblank.c:1325 vkms_crtc_atomic_disable+0x20/0x30 drivers/gpu/drm/vkms/vkms_crtc.c:234 disable_outputs drivers/gpu/drm/drm_atomic_helper.c:1227 [inline] drm_atomic_helper_commit_modeset_disables+0xab0/0x15bc drivers/gpu/drm/drm_atomic_helper.c:1431 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:1803 drm_atomic_helper_commit+0x5fc/0x644 drivers/gpu/drm/drm_atomic_helper.c:2043 drm_atomic_commit+0x24c/0x2a0 drivers/gpu/drm/drm_atomic.c:1452 drm_client_modeset_commit_atomic+0x5a4/0x730 drivers/gpu/drm/drm_client_modeset.c:1055 drm_client_modeset_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_client_modeset.c:1158 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1184 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:253 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:280 [inline] drm_fb_helper_lastclose drivers/gpu/drm/drm_fb_helper.c:2106 [inline] drm_fbdev_client_restore+0xe8/0x17c drivers/gpu/drm/drm_fb_helper.c:2518 drm_client_dev_restore+0x12c/0x24c drivers/gpu/drm/drm_client.c:247 drm_lastclose drivers/gpu/drm/drm_file.c:462 [inline] drm_release+0x4dc/0x624 drivers/gpu/drm/drm_file.c:493 __fput+0x30c/0x7bc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2148/0x3474 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 irq event stamp: 2156 hardirqs last enabled at (2155): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (2155): [] _raw_spin_unlock_irq+0x3c/0x90 kernel/locking/spinlock.c:202 hardirqs last disabled at (2156): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (2156): [] _raw_spin_lock_irq+0x34/0x9c kernel/locking/spinlock.c:170 softirqs last enabled at (2000): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (1998): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---