------------[ cut here ]------------ WARNING: CPU: 0 PID: 20643 at drivers/gpu/drm/vkms/vkms_crtc.c:100 vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:100 Modules linked in: CPU: 0 UID: 0 PID: 20643 Comm: syz.3.3492 Not tainted 6.12.0-rc7-syzkaller-00125-gcfaaa7d010d1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 RIP: 0010:vkms_get_vblank_timestamp+0x183/0x1b0 drivers/gpu/drm/vkms/vkms_crtc.c:100 Code: 42 80 3c 30 00 74 08 48 89 ef e8 a8 85 09 fc 48 89 5d 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d e9 3e ff fa 05 e8 3e a8 9f 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:ffffc900041d72a8 EFLAGS: 00010287 RAX: ffffffff85f541d2 RBX: 0000012ce845463f RCX: 0000000000040000 RDX: ffffc90012659000 RSI: 000000000000c8a9 RDI: 000000000000c8aa RBP: ffffc900041d7440 R08: ffffffff85f5413f R09: 1ffff1100d9ad6a2 R10: dffffc0000000000 R11: ffffffff85f54050 R12: 0000012ce845463f R13: ffff8881423e8150 R14: 1ffff9200083ae88 R15: ffff88802511c000 FS: 00007f0df55096c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c2c5911 CR3: 000000006ddfa000 CR4: 0000000000350ef0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:878 [inline] drm_crtc_next_vblank_start+0x22b/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+0x298/0x2f0 drivers/gpu/drm/drm_atomic.c:1516 drm_client_modeset_commit_atomic+0x676/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1068 drm_client_modeset_commit_locked+0xe0/0x520 drivers/gpu/drm/drm_client_modeset.c:1171 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1371 [inline] drm_fb_helper_pan_display+0x379/0xc10 drivers/gpu/drm/drm_fb_helper.c:1431 fb_pan_display+0x3a5/0x680 drivers/video/fbdev/core/fbmem.c:191 bit_update_start+0x4d/0x1c0 drivers/video/fbdev/core/bitblit.c:381 fbcon_switch+0x144d/0x2250 drivers/video/fbdev/core/fbcon.c:2186 redraw_screen+0x548/0xe90 drivers/tty/vt/vt.c:957 do_fb_ioctl+0x71b/0x7b0 drivers/video/fbdev/core/fb_chrdev.c:92 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:893 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: 0033:0x7f0df477e719 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:00007f0df5509038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f0df4936058 RCX: 00007f0df477e719 RDX: 0000000020000100 RSI: 0000000000004601 RDI: 0000000000000008 RBP: 00007f0df47f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0df4936058 R15: 00007ffcc82c8728