------------[ cut here ]------------ WARNING: CPU: 0 PID: 12288 at drivers/gpu/drm/vkms/vkms_crtc.c:98 vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:98 Modules linked in: CPU: 0 UID: 0 PID: 12288 Comm: syz.4.1807 Not tainted 6.14.0-rc4-syzkaller-00248-g03d38806a902 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:98 Code: 42 80 3c 30 00 74 08 48 89 ef e8 c8 e0 fc fb 48 89 5d 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 8e 2c 98 fb 90 <0f> 0b 90 eb e4 89 d9 80 e1 07 38 c1 0f 8c cd fe ff ff 48 89 df e8 RSP: 0018:ffffc90003487028 EFLAGS: 00010283 RAX: ffffffff86299232 RBX: 000000b7af08fad3 RCX: 0000000000080000 RDX: ffffc9000e0f9000 RSI: 0000000000000c07 RDI: 0000000000000c08 RBP: ffffc900034871c0 R08: ffffffff8629919f R09: 0000000000000000 R10: ffffc900036b9000 R11: ffffffff862990b0 R12: 000000b7af08fad3 R13: ffff888020b71950 R14: 1ffff92000690e38 R15: ffff888024c00000 FS: 00007f448d5976c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3fad4c CR3: 000000005b0c6000 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:878 [inline] drm_crtc_next_vblank_start+0x229/0x490 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1558 [inline] drm_atomic_helper_wait_for_fences+0x277/0x8e0 drivers/gpu/drm/drm_atomic_helper.c:1605 drm_atomic_helper_commit+0x53a/0x9f0 drivers/gpu/drm/drm_atomic_helper.c:2034 drm_atomic_commit+0x294/0x2f0 drivers/gpu/drm/drm_atomic.c:1518 drm_client_modeset_commit_atomic+0x670/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1079 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1182 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1379 [inline] drm_fb_helper_pan_display+0x3e8/0xc20 drivers/gpu/drm/drm_fb_helper.c:1439 fb_pan_display+0x3a3/0x680 drivers/video/fbdev/core/fbmem.c:191 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:381 fbcon_switch+0x144b/0x2250 drivers/video/fbdev/core/fbcon.c:2186 redraw_screen+0x546/0xe90 drivers/tty/vt/vt.c:957 fbcon_do_set_font+0xd4b/0x1410 drivers/video/fbdev/core/fbcon.c:2451 con_font_default drivers/tty/vt/vt.c:4833 [inline] con_font_op+0x93d/0x1300 drivers/tty/vt/vt.c:4854 vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline] vt_ioctl+0x1cab/0x2020 drivers/tty/vt/vt_ioctl.c:751 tty_ioctl+0x90f/0xdc0 drivers/tty/tty_io.c:2802 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f448c78d169 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:00007f448d597038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f448c9a6080 RCX: 00007f448c78d169 RDX: 0000400000000400 RSI: 0000000000004b72 RDI: 000000000000000a RBP: 00007f448c80e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f448c9a6080 R15: 00007ffd9c0d7668