------------[ cut here ]------------ WARNING: drivers/gpu/drm/vkms/vkms_crtc.c:97 at vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97, CPU#1: syz.2.507/8137 Modules linked in: CPU: 1 UID: 0 PID: 8137 Comm: syz.2.507 Not tainted 6.16.0-rc4-next-20250702-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97 Code: 42 80 3c 28 00 74 08 48 89 df e8 14 84 2d fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 10 d4 7b 05 cc e8 8a 6f c9 fb 90 <0f> 0b 90 eb e3 44 89 e1 80 e1 07 38 c1 0f 8c ff fe ff ff 4c 89 e7 RSP: 0000:ffffc90004e36e48 EFLAGS: 00010283 RAX: ffffffff85f66556 RBX: ffffc90004e36fc0 RCX: 0000000000080000 RDX: ffffc9000fb1c000 RSI: 0000000000000acd RDI: 0000000000000ace RBP: 1ffff920009c6df8 R08: ffffffff8fa17c37 R09: 1ffffffff1f42f86 R10: dffffc0000000000 R11: ffffffff85f66420 R12: 0000006034e99876 R13: dffffc0000000000 R14: ffff888141704028 R15: 0000006034e99876 FS: 00007f9c9b5976c0(0000) GS:ffff888125d1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30307ff8 CR3: 0000000040dd8000 CR4: 00000000003526f0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:879 [inline] drm_crtc_next_vblank_start+0x226/0x470 drivers/gpu/drm/drm_vblank.c:1013 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1711 [inline] drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1758 commit_tail+0x79/0x3a0 drivers/gpu/drm/drm_atomic_helper.c:1972 drm_atomic_helper_commit+0xa6b/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2226 drm_atomic_commit+0x25f/0x2c0 drivers/gpu/drm/drm_atomic.c:1577 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1103 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1206 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1232 __drm_fb_helper_restore_fbdev_mode_unlocked+0x9d/0x1b0 drivers/gpu/drm/drm_fb_helper.c:238 drm_fb_helper_set_par+0xaf/0x100 drivers/gpu/drm/drm_fb_helper.c:1360 fb_set_var+0x82b/0xf50 drivers/video/fbdev/core/fbmem.c:319 fbcon_resize+0xc51/0x1610 drivers/video/fbdev/core/fbcon.c:2076 resize_screen drivers/tty/vt/vt.c:1120 [inline] vc_do_resize+0x2c0/0x1770 drivers/tty/vt/vt.c:1177 vt_resizex+0x3c0/0x550 drivers/tty/vt/vt_ioctl.c:717 vt_ioctl+0x127b/0x1f00 drivers/tty/vt/vt_ioctl.c:937 tty_ioctl+0x926/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:598 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:584 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9c9a78e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9c9b597038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f9c9a9b6240 RCX: 00007f9c9a78e929 RDX: 0000200000000000 RSI: 000000000000560a RDI: 0000000000000003 RBP: 00007f9c9a810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9c9a9b6240 R15: 00007ffda8e1f688