------------[ cut here ]------------ WARNING: CPU: 0 PID: 11030 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x188/0x1e4 drivers/gpu/drm/vkms/vkms_crtc.c:116 Modules linked in: CPU: 0 PID: 11030 Comm: syz-executor.1 Not tainted 6.4.0-rc1-syzkaller-00011-g1dc3731daf1f #0 Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x188/0x1e4 drivers/gpu/drm/vkms/vkms_crtc.c:103 lr : drm_crtc_get_last_vbltimestamp+0x140/0x184 drivers/gpu/drm/drm_vblank.c:877 sp : ffff800019f273a0 x29: ffff800019f273a0 x28: 0000000000000003 x27: ffff000010a10dc0 x26: 0000000000000000 x25: 0000000000000001 x24: ffff000010a10dc0 x23: ffff80000cfc44e0 x22: 0000079e8c61bc90 x21: ffff800019f27570 x20: ffff00000e43b080 x19: ffff000010a10dc0 x18: 0000000000000000 x17: 0048000000000326 x16: 0309030303260300 x15: 1ffff000033e4e26 x14: 00000000f1f1f1f1 x13: 0000000000000007 x12: ffff7000033e4e73 x11: 1ffff000033e4e72 x10: ffff7000033e4e72 x9 : dfff800000000000 x8 : 0000000041b58ab3 x7 : ffff7000033e4e84 x6 : dfff800000000000 x5 : 0000000000000000 x4 : ffff800009a33dd8 x3 : 1fffe00001c87649 x2 : 1fffe00001c87635 x1 : 0000000000000000 x0 : 0000079e8c61bc90 Call trace: vkms_get_vblank_timestamp+0x188/0x1e4 drivers/gpu/drm/vkms/vkms_crtc.c:116 drm_crtc_get_last_vbltimestamp+0x140/0x184 drivers/gpu/drm/drm_vblank.c:877 drm_crtc_next_vblank_start+0x11c/0x244 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1537 [inline] drm_atomic_helper_wait_for_fences+0x17c/0x610 drivers/gpu/drm/drm_atomic_helper.c:1584 drm_atomic_helper_commit drivers/gpu/drm/drm_atomic_helper.c:2013 [inline] drm_atomic_helper_commit+0x170/0x2c0 drivers/gpu/drm/drm_atomic_helper.c:1985 drm_atomic_commit+0x1b0/0x290 drivers/gpu/drm/drm_atomic.c:1503 drm_client_modeset_commit_atomic+0x48c/0x5e8 drivers/gpu/drm/drm_client_modeset.c:1045 drm_client_modeset_commit_locked+0x108/0x400 drivers/gpu/drm/drm_client_modeset.c:1148 drm_client_modeset_commit+0x44/0x74 drivers/gpu/drm/drm_client_modeset.c:1174 __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:230 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline] drm_fb_helper_lastclose+0xb4/0x130 drivers/gpu/drm/drm_fb_helper.c:2353 drm_fbdev_generic_client_restore+0x30/0x4c drivers/gpu/drm/drm_fbdev_generic.c:260 drm_client_dev_restore+0x128/0x210 drivers/gpu/drm/drm_client.c:236 drm_lastclose+0xc8/0x180 drivers/gpu/drm/drm_file.c:462 drm_release+0x2b8/0x404 drivers/gpu/drm/drm_file.c:493 __fput+0x1ac/0x860 fs/file_table.c:321 ____fput+0x10/0x1c fs/file_table.c:349 task_work_run+0x124/0x20c kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x908/0x26b4 arch/arm64/kernel/signal.c:1304 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+0x10c/0x130 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0xb8/0xbc arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 irq event stamp: 2304 hardirqs last enabled at (2303): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (2303): [] exit_to_kernel_mode+0x38/0x118 arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (2304): [] el1_dbg+0x24/0x9c arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (2298): [] _stext+0x804/0xd68 softirqs last disabled at (2279): [] ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]---