------------[ cut here ]------------ WARNING: CPU: 1 PID: 5038 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x128/0x16c drivers/gpu/drm/vkms/vkms_crtc.c:110 Modules linked in: CPU: 1 UID: 0 PID: 5038 Comm: syz.1.720 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x128/0x16c drivers/gpu/drm/vkms/vkms_crtc.c:97 lr : vkms_get_vblank_timestamp+0x20/0x16c drivers/gpu/drm/vkms/vkms_crtc.c:88 sp : ffff80008f836c30 x29: ffff80008f836c30 x28: ffff00001f134800 x27: 0000000000000003 x26: ffff00000f6fc080 x25: 0000000000000001 x24: 1fffe00001ee4c38 x23: ffff800085ab5080 x22: ffff80008f836e00 x21: 0000009a3bcd0e30 x20: ffff00000f6fc080 x19: ffff00000f726080 x18: 0000000000000002 x17: ffff8000870bef80 x16: ffff00006a0ad4c4 x15: ffff800080af526c x14: ffff800081b3bd94 x13: 0000000000000000 x12: ffff80008e539000 x11: 1fffe00003e26b22 x10: ffff600003e26b22 x9 : dfff800000000000 x8 : 0000000041b58ab3 x7 : ffff700011f06d96 x6 : dfff800000000000 x5 : 0000000000000000 x4 : 1fffe00001ee4c4a x3 : 0000000000000000 x2 : 1fffe00001ee4c35 x1 : 0000000000000000 x0 : 0000009a3bcd0e30 Call trace: vkms_get_vblank_timestamp+0x128/0x16c drivers/gpu/drm/vkms/vkms_crtc.c:110 (P) drm_crtc_get_last_vbltimestamp+0x140/0x184 drivers/gpu/drm/drm_vblank.c:879 drm_crtc_next_vblank_start+0x11c/0x244 drivers/gpu/drm/drm_vblank.c:1013 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1711 [inline] drm_atomic_helper_wait_for_fences+0x184/0x614 drivers/gpu/drm/drm_atomic_helper.c:1758 drm_atomic_helper_commit+0x170/0x2b4 drivers/gpu/drm/drm_atomic_helper.c:2187 drm_atomic_commit+0x18c/0x23c drivers/gpu/drm/drm_atomic.c:1577 drm_client_modeset_commit_atomic+0x4a4/0x5f8 drivers/gpu/drm/drm_client_modeset.c:1103 drm_client_modeset_commit_locked+0x108/0x3f8 drivers/gpu/drm/drm_client_modeset.c:1206 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1388 [inline] drm_fb_helper_pan_display+0x260/0x844 drivers/gpu/drm/drm_fb_helper.c:1448 fb_pan_display+0x1d0/0x5f8 drivers/video/fbdev/core/fbmem.c:193 fb_set_var+0x5f8/0xf70 drivers/video/fbdev/core/fbmem.c:330 fbcon_resize+0x94c/0xd1c drivers/video/fbdev/core/fbcon.c:2089 resize_screen drivers/tty/vt/vt.c:1120 [inline] vc_do_resize+0x290/0xdcc drivers/tty/vt/vt.c:1200 __vc_resize+0x44/0x6c drivers/tty/vt/vt.c:1302 vt_resizex drivers/tty/vt/vt_ioctl.c:717 [inline] vt_ioctl+0x11cc/0x249c drivers/tty/vt/vt_ioctl.c:937 tty_ioctl+0x1c8/0x14f8 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl fs/ioctl.c:584 [inline] __arm64_sys_ioctl+0x124/0x1a4 fs/ioctl.c:584 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x50/0x1a0 arch/arm64/kernel/entry-common.c:879 el0t_64_sync_handler+0xa0/0xe4 arch/arm64/kernel/entry-common.c:898 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 3310 hardirqs last enabled at (3309): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:86 [inline] hardirqs last enabled at (3309): [] exit_to_kernel_mode+0x38/0x118 arch/arm64/kernel/entry-common.c:96 hardirqs last disabled at (3310): [] el1_brk64+0x1c/0x48 arch/arm64/kernel/entry-common.c:574 softirqs last enabled at (3304): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (3304): [] handle_softirqs+0x88c/0xdb4 kernel/softirq.c:607 softirqs last disabled at (3297): [] __do_softirq+0x14/0x20 kernel/softirq.c:613 ---[ end trace 0000000000000000 ]---