------------[ cut here ]------------ WARNING: CPU: 0 PID: 8680 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 Modules linked in: CPU: 0 UID: 0 PID: 8680 Comm: syz.4.504 Not tainted 6.16.0-rc7-syzkaller-g82af5ea7c611 #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 lr : vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 sp : ffff80009c9a74e0 x29: ffff80009c9a74e0 x28: 1fffe00018b12538 x27: ffff0000c5892880 x26: ffff80009c9a7520 x25: 1ffff00013934ea4 x24: 1ffff00013934ec8 x23: dfff800000000000 x22: 00000020d433c8a0 x21: 00000020d433c8a0 x20: ffff0000c96a8080 x19: ffff80009c9a7640 x18: 1fffe000337d1c76 x17: 0048000000000326 x16: ffff80008051f01c x15: 0000000000000001 x14: 1ffff00012e7e5b8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff700012e7e5b9 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000c9699e80 x7 : ffff8000806228b8 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff80009c9a7640 x1 : 00000020d433c8a0 x0 : 00000020d433c8a0 Call trace: vkms_get_vblank_timestamp+0x104/0x15c drivers/gpu/drm/vkms/vkms_crtc.c:97 (P) drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:879 [inline] drm_crtc_next_vblank_start+0x1b8/0x380 drivers/gpu/drm/drm_vblank.c:1013 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1596 [inline] drm_atomic_helper_wait_for_fences+0x1a0/0x78c drivers/gpu/drm/drm_atomic_helper.c:1643 commit_tail+0x80/0x3bc drivers/gpu/drm/drm_atomic_helper.c:1857 drm_atomic_helper_commit+0x84c/0x8cc drivers/gpu/drm/drm_atomic_helper.c:2111 drm_atomic_commit+0x204/0x25c drivers/gpu/drm/drm_atomic.c:1577 drm_client_modeset_commit_atomic+0x524/0x6ac drivers/gpu/drm/drm_client_modeset.c:1101 drm_client_modeset_commit_locked+0xd0/0x4a0 drivers/gpu/drm/drm_client_modeset.c:1204 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1230 __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:267 [inline] drm_fb_helper_lastclose+0x90/0x188 drivers/gpu/drm/drm_fb_helper.c:1985 drm_fbdev_client_restore+0x3c/0x50 drivers/gpu/drm/clients/drm_fbdev_client.c:31 drm_client_dev_restore+0x120/0x238 drivers/gpu/drm/drm_client_event.c:116 drm_lastclose drivers/gpu/drm/drm_file.c:396 [inline] drm_release+0x2f8/0x3e0 drivers/gpu/drm/drm_file.c:429 __fput+0x340/0x75c fs/file_table.c:465 ____fput+0x20/0x58 fs/file_table.c:493 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x174/0x1f4 arch/arm64/kernel/entry-common.c:155 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:173 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:182 [inline] el0_svc+0xb8/0x180 arch/arm64/kernel/entry-common.c:880 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 61580 hardirqs last enabled at (61579): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:86 [inline] hardirqs last enabled at (61579): [] exit_to_kernel_mode+0xc0/0xf0 arch/arm64/kernel/entry-common.c:96 hardirqs last disabled at (61580): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (61576): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (61576): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (61537): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]---