------------[ cut here ]------------ WARNING: CPU: 0 PID: 7408 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: 7408 Comm: syz.1.170 Not tainted 6.16.0-rc4-syzkaller-g3cd1604f930f #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 : ffff8000a0256e00 x29: ffff8000a0256e00 x28: 1fffe000185b1d38 x27: ffff0000c2d8e880 x26: ffff8000a0256e40 x25: 1ffff0001404adc8 x24: 1ffff0001404adec x23: dfff800000000000 x22: 00000013c3bd3248 x21: 00000013c3bd3248 x20: ffff0000c7474080 x19: ffff8000a0256f60 x18: 1fffe000337d8876 x17: ffff80008f64e000 x16: ffff80008aedd8d0 x15: 0000000000000002 x14: 1fffe0001b7ad621 x13: 0000000000000000 x12: ffff80009e809000 x11: ffff60001b7ad623 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000cc6d0000 x7 : 0000000000000000 x6 : ffff80009e809000 x5 : ffff0000dbd6b118 x4 : ffff0000dbd6b0d8 x3 : 0000000000000000 x2 : ffff8000a0256f60 x1 : 00000013c3bd3248 x0 : 00000013c3bd3248 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 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1387 [inline] drm_fb_helper_pan_display+0x36c/0xac4 drivers/gpu/drm/drm_fb_helper.c:1447 fb_pan_display+0x2dc/0x554 drivers/video/fbdev/core/fbmem.c:193 bit_update_start+0x4c/0x1e4 drivers/video/fbdev/core/bitblit.c:380 fbcon_switch+0x10f4/0x1ad8 drivers/video/fbdev/core/fbcon.c:2192 redraw_screen+0x4c0/0xcac drivers/tty/vt/vt.c:965 vc_do_resize+0xc80/0x112c drivers/tty/vt/vt.c:1280 __vc_resize+0x5c/0x70 drivers/tty/vt/vt.c:1302 vt_resizex+0x354/0x4ac drivers/tty/vt/vt_ioctl.c:717 vt_ioctl+0x680/0x1e7c drivers/tty/vt/vt_ioctl.c:937 tty_ioctl+0x874/0xd8c drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:893 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x180 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 3144 hardirqs last enabled at (3143): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:86 [inline] hardirqs last enabled at (3143): [] exit_to_kernel_mode+0xc0/0xf0 arch/arm64/kernel/entry-common.c:96 hardirqs last disabled at (3144): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (1568): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (1568): [] handle_softirqs+0xaf8/0xc88 kernel/softirq.c:607 softirqs last disabled at (1547): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]---