------------[ cut here ]------------ WARNING: CPU: 1 PID: 2033 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: 2033 Comm: syz-executor.5 Not tainted 6.4.0-rc2-syzkaller-gf1fcbaa18b28 #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 : ffff8000251c6ed0 x29: ffff8000251c6ed0 x28: ffff0000c58d7880 x27: 0000000000000000 x26: 1ffff00004a38de8 x25: 1ffff00004a38e0c x24: 0000000000000000 x23: ffff0000cc168000 x22: dfff800000000000 x21: 0000023c2b761fd8 x20: 0000023c2b761fd8 x19: ffff8000251c7060 x18: 1fffe00036848fbe x17: ffff800015ead000 x16: ffff80000830ff94 x15: ffff0001b4247dfc x14: ffff800015eb0570 x13: dfff800000000000 x12: 0000000000000003 x11: 0000000000040000 x10: 000000000003c919 x9 : ffff800029041000 x8 : 000000000003c91a x7 : ffff80000841a328 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff8000251c7060 x1 : 0000023c2b761fd8 x0 : 0000023c2b761fd8 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 commit_tail+0x80/0x3b8 drivers/gpu/drm/drm_atomic_helper.c:1798 drm_atomic_helper_commit+0x8cc/0x94c drivers/gpu/drm/drm_atomic_helper.c:2052 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_modechanged+0x9f4/0x1090 drivers/video/fbdev/core/fbcon.c:2704 fbcon_update_vcs+0x3c/0x4c drivers/video/fbdev/core/fbcon.c:2749 do_fb_ioctl+0xb40/0xe34 drivers/video/fbdev/core/fbmem.c:1127 fb_ioctl+0xec/0x134 drivers/video/fbdev/core/fbmem.c:1204 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: 3564 hardirqs last enabled at (3563): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline] hardirqs last enabled at (3563): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:94 hardirqs last disabled at (3564): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405 softirqs last enabled at (116): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (114): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---