------------[ cut here ]------------ WARNING: CPU: 0 PID: 5440 at drivers/gpu/drm/vkms/vkms_crtc.c:98 vkms_get_vblank_timestamp+0x185/0x1e0 drivers/gpu/drm/vkms/vkms_crtc.c:98 Modules linked in: CPU: 0 UID: 0 PID: 5440 Comm: syz.0.8878 Not tainted 6.13.0-rc4-syzkaller-00069-g8379578b11d5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:vkms_get_vblank_timestamp+0x185/0x1e0 drivers/gpu/drm/vkms/vkms_crtc.c:98 Code: da fb e8 ce a9 c8 fb 48 89 e9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 50 48 89 45 00 eb c0 e8 9c e3 da fb 90 <0f> 0b 90 eb b5 e8 01 8f 3d fc e9 dc fe ff ff 48 89 df e8 84 8f 3d RSP: 0018:ffffc9000526f580 EFLAGS: 00010287 RAX: 0000000000002e12 RBX: 000002d9b6a5fd56 RCX: ffffc9000f159000 RDX: 0000000000080000 RSI: ffffffff85bf3214 RDI: 0000000000000006 RBP: ffffc9000526f6e8 R08: 0000000000000006 R09: 000002d9b6a5fd56 R10: 000002d9b6a5fd56 R11: 0000000000000000 R12: 000002d9b6a5fd56 R13: ffff888025c04000 R14: 0000000000004e20 R15: ffffffff85bf3090 FS: 00007f30ccdf36c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2c217ff8 CR3: 000000004677a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_crtc_get_last_vbltimestamp+0x103/0x1b0 drivers/gpu/drm/drm_vblank.c:878 drm_crtc_next_vblank_start+0x182/0x300 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+0x1fc/0x820 drivers/gpu/drm/drm_atomic_helper.c:1605 drm_atomic_helper_commit+0x1cf/0x380 drivers/gpu/drm/drm_atomic_helper.c:2034 drm_atomic_commit+0x232/0x300 drivers/gpu/drm/drm_atomic.c:1518 drm_client_modeset_commit_atomic+0x6a2/0x7f0 drivers/gpu/drm/drm_client_modeset.c:1070 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1173 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1377 [inline] drm_fb_helper_pan_display+0x2a5/0x990 drivers/gpu/drm/drm_fb_helper.c:1437 fb_pan_display+0x477/0x7d0 drivers/video/fbdev/core/fbmem.c:191 bit_update_start+0x49/0x1f0 drivers/video/fbdev/core/bitblit.c:381 fbcon_modechanged+0x589/0x6e0 drivers/video/fbdev/core/fbcon.c:2686 fbcon_set_all_vcs+0x1d6/0x450 drivers/video/fbdev/core/fbcon.c:2726 fbcon_update_vcs+0x2c/0x50 drivers/video/fbdev/core/fbcon.c:2733 do_fb_ioctl+0x781/0x7d0 drivers/video/fbdev/core/fb_chrdev.c:92 fb_ioctl+0xe5/0x150 drivers/video/fbdev/core/fb_chrdev.c:169 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __x64_sys_ioctl+0x190/0x200 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f30cbf85d29 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:00007f30ccdf3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f30cc175fa0 RCX: 00007f30cbf85d29 RDX: 00000000200001c0 RSI: 0000000000004601 RDI: 0000000000000005 RBP: 00007f30cc001b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f30cc175fa0 R15: 00007ffedb898248