------------[ cut here ]------------ WARNING: CPU: 0 PID: 10035 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: 10035 Comm: syz.4.774 Not tainted 6.16.0-rc5-syzkaller-gec4801305969 #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 : ffff80009bd971a0 x29: ffff80009bd971a0 x28: 1fffe000187f6f38 x27: ffff0000c3fb7880 x26: ffff80009bd971e0 x25: 1ffff000137b2e3c x24: 1ffff000137b2e60 x23: dfff800000000000 x22: 000000367b036930 x21: 000000367b036930 x20: ffff0000c99b8080 x19: ffff80009bd97300 x18: 0000000000000000 x17: 0048000000000326 x16: ffff80008aefc568 x15: 0000000000000002 x14: 1fffe0001b1bb221 x13: 0000000000000000 x12: ffff80009ea79000 x11: 0000000000080000 x10: 000000000000d071 x9 : ffff8000a555b000 x8 : 000000000000d072 x7 : 0000000000000000 x6 : ffff80009ea79000 x5 : ffff0000d8dd9118 x4 : ffff0000d8dd90d8 x3 : 0000000000000000 x2 : ffff80009bd97300 x1 : 000000367b036930 x0 : 000000367b036930 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 drm_atomic_helper_commit+0x4d0/0x8cc drivers/gpu/drm/drm_atomic_helper.c:2072 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 get_signal+0x112c/0x12f8 kernel/signal.c:2807 do_signal+0x274/0x4438 arch/arm64/kernel/signal.c:1615 do_notify_resume+0xb0/0x1f4 arch/arm64/kernel/entry-common.c:152 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: 836 hardirqs last enabled at (835): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:86 [inline] hardirqs last enabled at (835): [] exit_to_kernel_mode+0xc0/0xf0 arch/arm64/kernel/entry-common.c:96 hardirqs last disabled at (836): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (526): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (526): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (521): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]---