------------[ cut here ]------------ WARNING: CPU: 1 PID: 16256 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1cf/0x240 drivers/gpu/drm/vkms/vkms_crtc.c:103 Modules linked in: CPU: 1 PID: 16256 Comm: syz-executor.4 Not tainted 6.3.0-syzkaller-12423-g865fdb08197e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:vkms_get_vblank_timestamp+0x1cf/0x240 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: c8 70 fc e8 f3 ce 60 fc 4c 89 e1 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 65 49 89 04 24 eb c4 e8 d1 c8 70 fc <0f> 0b eb bb e8 78 8f c3 fc e9 de fe ff ff e8 ae 8f c3 fc e9 78 fe RSP: 0018:ffffc9000b7af3d8 EFLAGS: 00010212 RAX: 0000000000005cae RBX: 000000a19956096b RCX: ffffc9000e3a7000 RDX: 0000000000040000 RSI: ffffffff851394cf RDI: 0000000000000006 RBP: ffff88801eec4000 R08: 0000000000000006 R09: 000000a19956096b R10: 000000a19956096b R11: 0000000000000000 R12: ffffc9000b7af540 R13: 000000a19956096b R14: 0000000000004e20 R15: ffffffff85139300 FS: 00007efe567dd700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020438000 CR3: 0000000029815000 CR4: 00000000003526e0 DR0: 00000000ffff070c DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: drm_crtc_get_last_vbltimestamp+0x102/0x1a0 drivers/gpu/drm/drm_vblank.c:877 drm_crtc_next_vblank_start+0x186/0x300 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1537 [inline] drm_atomic_helper_wait_for_fences+0x1f3/0x840 drivers/gpu/drm/drm_atomic_helper.c:1584 drm_atomic_helper_commit drivers/gpu/drm/drm_atomic_helper.c:2013 [inline] drm_atomic_helper_commit+0x1bd/0x370 drivers/gpu/drm/drm_atomic_helper.c:1985 drm_atomic_commit+0x20a/0x300 drivers/gpu/drm/drm_atomic.c:1503 drm_client_modeset_commit_atomic+0x69b/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1045 drm_client_modeset_commit_locked+0x149/0x580 drivers/gpu/drm/drm_client_modeset.c:1148 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1718 [inline] drm_fb_helper_pan_display+0x28f/0x970 drivers/gpu/drm/drm_fb_helper.c:1778 fb_pan_display+0x2fb/0x6c0 drivers/video/fbdev/core/fbmem.c:924 bit_update_start+0x49/0x1f0 drivers/video/fbdev/core/bitblit.c:387 fbcon_switch+0xbcf/0x1380 drivers/video/fbdev/core/fbcon.c:2169 redraw_screen+0x2bd/0x740 drivers/tty/vt/vt.c:970 fbcon_modechanged+0x526/0x620 drivers/video/fbdev/core/fbcon.c:2704 fbcon_update_vcs+0x3e/0x50 drivers/video/fbdev/core/fbcon.c:2749 do_fb_ioctl+0x6e2/0x750 drivers/video/fbdev/core/fbmem.c:1127 fb_ioctl+0xeb/0x150 drivers/video/fbdev/core/fbmem.c:1204 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7efe57c8c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007efe567dd168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007efe57dac050 RCX: 00007efe57c8c169 RDX: 0000000020000000 RSI: 0000000000004601 RDI: 0000000000000007 RBP: 00007efe57ce7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007efe57ecfb1f R14: 00007efe567dd300 R15: 0000000000022000