------------[ cut here ]------------ WARNING: CPU: 0 PID: 7597 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: 7597 Comm: syz-executor.1 Not tainted 6.4.0-rc2-syzkaller-00163-g2d1bcbc6cd70 #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 : ffff800013146e40 x29: ffff800013146e40 x28: 0000000000000003 x27: ffff000010770dc0 x26: 0000000000000000 x25: 0000000000000001 x24: ffff000010770dc0 x23: ffff80000cfc4ac0 x22: 000007f3b03392f0 x21: ffff800013147010 x20: ffff00000adce880 x19: ffff000010770dc0 x18: 0000000000000000 x17: 0048000000000326 x16: 0309030303260300 x15: 1ffff00002628d7a x14: 00000000f1f1f1f1 x13: 0000000000000007 x12: ffff700002628dc7 x11: 1ffff00002628dc6 x10: ffff700002628dc6 x9 : dfff800000000000 x8 : 0000000041b58ab3 x7 : ffff700002628dd8 x6 : dfff800000000000 x5 : 0000000000000000 x4 : ffff800009a34a68 x3 : 1fffe000015b9d49 x2 : 1fffe000015b9d35 x1 : 0000000000000000 x0 : 000007f3b03392f0 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 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1726 [inline] drm_fb_helper_pan_display+0x1e8/0x7b4 drivers/gpu/drm/drm_fb_helper.c:1786 fb_pan_display+0x278/0x514 drivers/video/fbdev/core/fbmem.c:924 bit_update_start+0x40/0x198 drivers/video/fbdev/core/bitblit.c:387 fbcon_switch+0xc84/0x1330 drivers/video/fbdev/core/fbcon.c:2169 redraw_screen+0x21c/0x5bc drivers/tty/vt/vt.c:970 fbcon_blank+0x6b8/0x848 drivers/video/fbdev/core/fbcon.c:2233 do_unblank_screen+0x1a0/0x37c drivers/tty/vt/vt.c:4385 unblank_screen drivers/tty/vt/vt.c:4404 [inline] tioclinux+0x410/0x830 drivers/tty/vt/vt.c:3165 vt_ioctl+0x1c68/0x29c8 drivers/tty/vt/vt_ioctl.c:762 tty_ioctl+0x1cc/0x181c drivers/tty/tty_io.c:2777 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x120/0x18c fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x50/0x124 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x130 arch/arm64/kernel/entry-common.c:637 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: 662 hardirqs last enabled at (661): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (661): [] exit_to_kernel_mode+0x38/0x118 arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (662): [] el1_dbg+0x24/0x9c arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (592): [] _stext+0x804/0xd68 softirqs last disabled at (561): [] ____do_softirq+0x10/0x1c arch/arm64/kernel/irq.c:80 ---[ end trace 0000000000000000 ]---