------------[ cut here ]------------ WARNING: CPU: 0 PID: 7162 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x188/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 0 PID: 7162 Comm: syz.3.268 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:vkms_get_vblank_timestamp+0x188/0x1d0 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 0d c8 ab fc 4c 89 33 b0 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 08 6c 54 fc <0f> 0b eb ea 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ba fe ff ff 4c RSP: 0018:ffffc90003476de8 EFLAGS: 00010287 RAX: ffffffff85312388 RBX: ffffc90003476f60 RCX: 0000000000080000 RDX: ffffc9000f0b3000 RSI: 000000000002f2ce RDI: 000000000002f2cf RBP: 1ffff9200068edec R08: ffffffff90da8557 R09: 1ffffffff21b50aa R10: dffffc0000000000 R11: fffffbfff21b50ab R12: 0000003304e0177a R13: dffffc0000000000 R14: ffff888020d20000 R15: 0000003304e0177a FS: 00007f969c7b46c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f969c793d58 CR3: 000000006d1e0000 CR4: 00000000003506f0 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline] drm_crtc_next_vblank_start+0x21f/0x450 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1583 [inline] drm_atomic_helper_wait_for_fences+0x263/0x8b0 drivers/gpu/drm/drm_atomic_helper.c:1630 commit_tail+0x79/0x390 drivers/gpu/drm/drm_atomic_helper.c:1844 drm_atomic_helper_commit+0xa42/0xae0 drivers/gpu/drm/drm_atomic_helper.c:2098 drm_atomic_commit+0x24c/0x2a0 drivers/gpu/drm/drm_atomic.c:1513 drm_client_modeset_commit_atomic+0x621/0x760 drivers/gpu/drm/drm_client_modeset.c:1057 drm_client_modeset_commit_locked+0xcb/0x4c0 drivers/gpu/drm/drm_client_modeset.c:1160 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1186 __drm_fb_helper_restore_fbdev_mode_unlocked+0x98/0x140 drivers/gpu/drm/drm_fb_helper.c:251 drm_fb_helper_set_par+0xaf/0x100 drivers/gpu/drm/drm_fb_helper.c:1358 fb_set_var+0x7ca/0xf20 drivers/video/fbdev/core/fbmem.c:852 fbcon_switch+0x955/0x1e80 drivers/video/fbdev/core/fbcon.c:2124 redraw_screen+0x561/0xe70 drivers/tty/vt/vt.c:969 vc_do_resize+0x1275/0x17d0 drivers/tty/vt/vt.c:1291 fbcon_modechanged+0x845/0x12c0 drivers/video/fbdev/core/fbcon.c:2713 do_fb_ioctl+0x6f0/0x740 drivers/video/fbdev/core/fb_chrdev.c:92 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f969b98f749 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:00007f969c7b4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f969bbe6180 RCX: 00007f969b98f749 RDX: 0000200000000040 RSI: 0000000000004601 RDI: 0000000000000008 RBP: 00007f969ba13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f969bbe6218 R14: 00007f969bbe6180 R15: 00007ffcb0019798