------------[ cut here ]------------ WARNING: CPU: 1 PID: 5302 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: 5302 Comm: syz.4.256 Not tainted 5.15.168-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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 : ffff800021047110 x29: ffff800021047110 x28: ffff8000210471d0 x27: ffff0000cb110ee8 x26: ffff8000210471c0 x25: 1ffff00004208e3a x24: 0000000000000000 x23: ffff0000cb110000 x22: dfff800000000000 x21: 000000181e6d7871 x20: 000000181e6d7871 x19: ffff8000210471d0 x18: 0000000000000000 x17: 0000000000000000 x16: ffff8000083052d8 x15: 0000000000000008 x14: 1ffff0000295606a x13: dfff800000000000 x12: ffff700004208e34 x11: 0000000000000003 x10: 0000000000000000 x9 : ffff0000c8243680 x8 : ffff80000b80e560 x7 : ffff80000b720010 x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff8000210471d0 x1 : 000000181e6d7871 x0 : 000000181e6d7871 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/0xb10 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+0x254/0x7c4 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:1117 [inline] drm_atomic_helper_commit_modeset_disables+0xa10/0x1488 drivers/gpu/drm/drm_atomic_helper.c:1321 vkms_atomic_commit_tail+0x5c/0x20c drivers/gpu/drm/vkms/vkms_drv.c:71 commit_tail+0x274/0x3cc drivers/gpu/drm/drm_atomic_helper.c:1693 drm_atomic_helper_commit+0x5fc/0x644 drivers/gpu/drm/drm_atomic_helper.c:1912 drm_atomic_commit+0xd8/0xf8 drivers/gpu/drm/drm_atomic.c:1426 drm_client_modeset_commit_atomic+0x594/0x730 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:252 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:279 [inline] drm_fb_helper_lastclose drivers/gpu/drm/drm_fb_helper.c:2005 [inline] drm_fbdev_client_restore+0xe8/0x17c drivers/gpu/drm/drm_fb_helper.c:2408 drm_client_dev_restore+0x12c/0x248 drivers/gpu/drm/drm_client.c:226 drm_lastclose drivers/gpu/drm/drm_file.c:467 [inline] drm_release+0x4dc/0x654 drivers/gpu/drm/drm_file.c:498 __fput+0x1c4/0x800 fs/file_table.c:280 ____fput+0x20/0x30 fs/file_table.c:308 task_work_run+0x130/0x1e4 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x262c/0x32b8 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xfc/0x1f0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 2338 hardirqs last enabled at (2337): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (2337): [] _raw_spin_unlock_irq+0x9c/0x134 kernel/locking/spinlock.c:202 hardirqs last disabled at (2338): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (2338): [] _raw_spin_lock_irq+0x38/0x13c kernel/locking/spinlock.c:170 softirqs last enabled at (2216): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (2214): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace f0289402926def92 ]---