------------[ cut here ]------------ WARNING: CPU: 1 PID: 31031 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: 31031 Comm: syz-executor.2 Tainted: G B 6.8.0-rc5-syzkaller-g9abbc24128bc #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 : ffff800099dc74d0 x29: ffff800099dc74d0 x28: ffff0000c7e09880 x27: 0000000000000000 x26: 1ffff000133b8ea8 x25: 1ffff000133b8ecc x24: 0000000000000000 x23: ffff0000c9b28000 x22: dfff800000000000 x21: 00000173bd081290 x20: 00000173bd081290 x19: ffff800099dc7660 x18: 0000000000000000 x17: 0000000000000000 x16: ffff80008ad5a610 x15: 0000000000000001 x14: 1fffe00025dd40aa x13: 0000000000000000 x12: ffff800099dc7560 x11: ffff800099dbffff x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000cc8a8000 x7 : 0000000000000000 x6 : ffff80008043097c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff800099dc7660 x1 : 00000173bd081290 x0 : 00000173bd081290 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_commit_locked+0xd0/0x4a8 drivers/gpu/drm/drm_client_modeset.c:1154 drm_client_modeset_commit+0x50/0x7c drivers/gpu/drm/drm_client_modeset.c:1180 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline] drm_fb_helper_lastclose+0xc0/0x160 drivers/gpu/drm/drm_fb_helper.c:2005 drm_fbdev_generic_client_restore+0x3c/0x50 drivers/gpu/drm/drm_fbdev_generic.c:258 drm_client_dev_restore+0x12c/0x24c drivers/gpu/drm/drm_client.c:247 drm_lastclose drivers/gpu/drm/drm_file.c:406 [inline] drm_release+0x4ac/0x504 drivers/gpu/drm/drm_file.c:437 __fput+0x30c/0x738 fs/file_table.c:376 __fput_sync+0x60/0x9c fs/file_table.c:461 __do_sys_close fs/open.c:1554 [inline] __se_sys_close fs/open.c:1539 [inline] __arm64_sys_close+0x150/0x1e0 fs/open.c:1539 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 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: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [] copy_process+0x1318/0x3478 kernel/fork.c:2441 softirqs last enabled at (0): [] copy_process+0x1340/0x3478 kernel/fork.c:2442 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace 0000000000000000 ]---