------------[ cut here ]------------ WARNING: CPU: 0 PID: 11197 at drivers/gpu/drm/vkms/vkms_crtc.c:97 vkms_get_vblank_timestamp+0x137/0x160 drivers/gpu/drm/vkms/vkms_crtc.c:97 Modules linked in: CPU: 0 UID: 0 PID: 11197 Comm: syz.3.1347 Not tainted 6.16.0-rc1-next-20250613-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 a4 b6 32 fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 5a f2 ce 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: 0018:ffffc90003d0f028 EFLAGS: 00010287 RAX: ffffffff85f17536 RBX: ffffc90003d0f1a0 RCX: 0000000000080000 RDX: ffffc9000dd90000 RSI: 00000000000023a9 RDI: 00000000000023aa RBP: 1ffff920007a1e34 R08: ffffc900033c9000 R09: 0000000000000000 R10: ffffc900033c9000 R11: ffffffff85f17400 R12: 00000091696beb0e R13: dffffc0000000000 R14: ffff888141bf8028 R15: 00000091696beb0e FS: 00007f787f13d6c0(0000) GS:ffff888125c41000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000004000 CR3: 0000000031b4c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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:1710 [inline] drm_atomic_helper_wait_for_fences+0x265/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1757 drm_atomic_helper_commit+0x5c7/0xb10 drivers/gpu/drm/drm_atomic_helper.c:2186 drm_atomic_commit+0x262/0x2c0 drivers/gpu/drm/drm_atomic.c:1577 drm_client_modeset_commit_atomic+0x620/0x760 drivers/gpu/drm/drm_client_modeset.c:1101 drm_client_modeset_commit_locked+0xcb/0x4d0 drivers/gpu/drm/drm_client_modeset.c:1204 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1387 [inline] drm_fb_helper_pan_display+0x3e7/0xbd0 drivers/gpu/drm/drm_fb_helper.c:1447 fb_pan_display+0x39b/0x680 drivers/video/fbdev/core/fbmem.c:193 bit_update_start+0x4d/0x1e0 drivers/video/fbdev/core/bitblit.c:380 fbcon_switch+0x1568/0x2040 drivers/video/fbdev/core/fbcon.c:2192 redraw_screen+0x56a/0xe90 drivers/tty/vt/vt.c:965 fbcon_do_set_font+0xb3d/0x1120 drivers/video/fbdev/core/fbcon.c:2457 con_font_set drivers/tty/vt/vt.c:4886 [inline] con_font_op+0xcaf/0x1070 drivers/tty/vt/vt.c:4933 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x1a8a/0x1f00 drivers/tty/vt/vt_ioctl.c:751 tty_ioctl+0x929/0xde0 drivers/tty/tty_io.c:2792 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893 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: 0033:0x7f787e38e929 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:00007f787f13d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f787e5b6080 RCX: 00007f787e38e929 RDX: 0000200000000040 RSI: 0000000000004b72 RDI: 0000000000000006 RBP: 00007f787e410b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f787e5b6080 R15: 00007ffd75c11f38