------------[ cut here ]------------ WARNING: CPU: 1 PID: 5370 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x148/0x1bc drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 1 PID: 5370 Comm: syz.4.140 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 pstate: 824000c5 (Nzcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x148/0x1bc drivers/gpu/drm/vkms/vkms_crtc.c:103 lr : vkms_get_vblank_timestamp+0x148/0x1bc drivers/gpu/drm/vkms/vkms_crtc.c:103 sp : ffff800020057300 x29: ffff800020057300 x28: ffff0000cb004000 x27: ffff70000400ae6c x26: ffff800011ec5d18 x25: ffff0000cb004ee8 x24: 1ffff0000400ae72 x23: ffff0000cb004000 x22: dfff800000000000 x21: 0000000fd28e2a2d x20: 0000000fd28e2a2d x19: ffff800020057390 x18: 0000000000000000 x17: 0000000000000000 x16: ffff8000082d84ec x15: 0000000000000000 x14: ffff70000400ae6c x13: 1ffff0000400ae6c x12: 0000000000ff0100 x11: 0000000000000003 x10: 0000000000000000 x9 : ffff80000b53a26c x8 : ffff0000cd941b40 x7 : ffff80000b45991c x6 : 0000000000000000 x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff800020057390 x1 : 0000000fd28e2a2d x0 : 0000000fd28e2a2d Call trace: vkms_get_vblank_timestamp+0x148/0x1bc drivers/gpu/drm/vkms/vkms_crtc.c:103 drm_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:881 [inline] drm_update_vblank_count+0x214/0xa00 drivers/gpu/drm/drm_vblank.c:303 drm_vblank_disable_and_save+0xb8/0x334 drivers/gpu/drm/drm_vblank.c:477 drm_crtc_vblank_off+0x19c/0x6fc 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:1145 [inline] drm_atomic_helper_commit_modeset_disables+0x990/0x13b4 drivers/gpu/drm/drm_atomic_helper.c:1349 vkms_atomic_commit_tail+0x5c/0x20c drivers/gpu/drm/vkms/vkms_drv.c:71 commit_tail+0x268/0x3c8 drivers/gpu/drm/drm_atomic_helper.c:1721 drm_atomic_helper_commit+0x5f4/0x63c drivers/gpu/drm/drm_atomic_helper.c:1940 drm_atomic_commit+0xd8/0xf8 drivers/gpu/drm/drm_atomic.c:1426 drm_client_modeset_commit_atomic+0x538/0x6d8 drivers/gpu/drm/drm_client_modeset.c:1055 drm_client_modeset_commit_locked+0xd0/0x4a0 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:2007 [inline] drm_fbdev_client_restore+0xbc/0x154 drivers/gpu/drm/drm_fb_helper.c:2410 drm_client_dev_restore+0x120/0x234 drivers/gpu/drm/drm_client.c:226 drm_lastclose drivers/gpu/drm/drm_file.c:467 [inline] drm_release+0x4b0/0x610 drivers/gpu/drm/drm_file.c:498 __fput+0x1c0/0x7e8 fs/file_table.c:311 ____fput+0x20/0x30 fs/file_table.c:339 task_work_run+0x12c/0x1d8 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] do_notify_resume+0x2450/0x309c arch/arm64/kernel/signal.c:949 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+0xf0/0x1d0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 1666 hardirqs last enabled at (1665): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (1665): [] _raw_spin_unlock_irq+0x98/0x128 kernel/locking/spinlock.c:202 hardirqs last disabled at (1666): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (1666): [] _raw_spin_lock_irq+0x38/0x138 kernel/locking/spinlock.c:170 softirqs last enabled at (1584): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (1582): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace 215d59ad832858b4 ]---