------------[ cut here ]------------ WARNING: CPU: 1 PID: 11932 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 1 PID: 11932 Comm: syz-executor.2 Not tainted 6.4.0-rc3-syzkaller-geb0f1697d729 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103 lr : vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103 sp : ffff80002d7a6db0 x29: ffff80002d7a6db0 x28: ffff0000c7514880 x27: 0000000000000000 x26: 1ffff00005af4dc4 x25: 1ffff00005af4de8 x24: 0000000000000000 x23: ffff0000cc13c000 x22: dfff800000000000 x21: 00000064fde6ecd8 x20: 00000064fde6ecd8 x19: ffff80002d7a6f40 x18: ffff80002d7a6a00 x17: ffff800015ebd000 x16: ffff800012381170 x15: 0000000000000000 x14: ffff800015ec0570 x13: 0000000000000000 x12: ffff8000222ca000 x11: 0000000000000000 x10: 0000000000000000 x9 : 0000000000000000 x8 : ffff000130c9d340 x7 : 0000000000000000 x6 : ffff8000222ca000 x5 : ffff0000d93f60e8 x4 : ffff0000d93f60a8 x3 : 0000000000000000 x2 : ffff80002d7a6f40 x1 : 00000064fde6ecd8 x0 : 00000064fde6ecd8 Call trace: vkms_get_vblank_timestamp+0x1a4/0x1d4 drivers/gpu/drm/vkms/vkms_crtc.c:103 drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline] drm_crtc_next_vblank_start+0x1d4/0x3e0 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+0x200/0x7c4 drivers/gpu/drm/drm_atomic_helper.c:1584 drm_atomic_helper_commit+0x500/0x94c drivers/gpu/drm/drm_atomic_helper.c:2013 drm_atomic_commit+0x24c/0x2a0 drivers/gpu/drm/drm_atomic.c:1503 drm_client_modeset_commit_atomic+0x5a4/0x730 drivers/gpu/drm/drm_client_modeset.c:1045 drm_client_modeset_commit_locked+0xd0/0x4a8 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+0x334/0xa90 drivers/gpu/drm/drm_fb_helper.c:1786 fb_pan_display+0x2fc/0x574 drivers/video/fbdev/core/fbmem.c:924 bit_update_start+0x4c/0x1e4 drivers/video/fbdev/core/bitblit.c:387 fbcon_switch+0x1294/0x1c04 drivers/video/fbdev/core/fbcon.c:2169 redraw_screen+0x514/0xd54 drivers/tty/vt/vt.c:970 fbcon_do_set_font+0xbc0/0x1178 drivers/video/fbdev/core/fbcon.c:2437 fbcon_set_def_font+0x334/0x44c drivers/video/fbdev/core/fbcon.c:2552 con_font_default drivers/tty/vt/vt.c:4657 [inline] con_font_op+0x700/0xfc0 drivers/tty/vt/vt.c:4678 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x1a90/0x252c drivers/tty/vt/vt_ioctl.c:752 tty_ioctl+0x8a4/0xd8c 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+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591 irq event stamp: 274 hardirqs last enabled at (273): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (273): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (274): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (174): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (172): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---