------------[ cut here ]------------ WARNING: CPU: 0 PID: 4009 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: 0 PID: 4009 Comm: syz-executor.1 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 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 : ffff800097c87150 x29: ffff800097c87150 x28: ffff0000c9252880 x27: 0000000000000000 x26: 1ffff00012f90e38 x25: 1ffff00012f90e5c x24: 0000000000000000 x23: ffff0000c94c4000 x22: dfff800000000000 x21: 000001beb4819f60 x20: 000001beb4819f60 x19: ffff800097c872e0 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80008032116c x15: 0000000000000001 x14: ffff80008eca0458 x13: dfff800000000000 x12: 0000000000000003 x11: 0000000000040000 x10: 0000000000001877 x9 : ffff80009e6ba000 x8 : 0000000000001878 x7 : ffff800080430b64 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff800097c872e0 x1 : 000001beb4819f60 x0 : 000001beb4819f60 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:867 [inline] drm_crtc_next_vblank_start+0x1d4/0x3e0 drivers/gpu/drm/drm_vblank.c:1002 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1557 [inline] drm_atomic_helper_wait_for_fences+0x200/0x7c4 drivers/gpu/drm/drm_atomic_helper.c:1604 commit_tail+0x80/0x3b8 drivers/gpu/drm/drm_atomic_helper.c:1818 drm_atomic_helper_commit+0x854/0x8d4 drivers/gpu/drm/drm_atomic_helper.c:2072 drm_atomic_commit+0x24c/0x2a0 drivers/gpu/drm/drm_atomic.c:1514 drm_client_modeset_commit_atomic+0x5a4/0x730 drivers/gpu/drm/drm_client_modeset.c:1051 drm_client_modeset_dpms+0x14c/0x790 drivers/gpu/drm/drm_client_modeset.c:1232 drm_fb_helper_blank+0x200/0x230 fb_blank+0x14c/0x228 drivers/video/fbdev/core/fbmem.c:355 do_fb_ioctl+0x594/0xd24 drivers/video/fbdev/core/fb_chrdev.c:145 fb_ioctl+0xec/0x134 drivers/video/fbdev/core/fb_chrdev.c:169 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:857 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 430 hardirqs last enabled at (429): [] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:85 [inline] hardirqs last enabled at (429): [] exit_to_kernel_mode+0xdc/0x10c arch/arm64/kernel/entry-common.c:95 hardirqs last disabled at (430): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (338): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (336): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---