------------[ cut here ]------------ WARNING: CPU: 0 PID: 13172 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1cd/0x210 Modules linked in: CPU: 0 PID: 13172 Comm: syz-executor.2 Not tainted 6.4.0-rc3-syzkaller-00015-g27e462c8fad4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 RIP: 0010:vkms_get_vblank_timestamp+0x1cd/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 03 42 80 3c 28 00 74 08 48 89 ef e8 bd c1 90 fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e3 ec 38 fc <0f> 0b eb e6 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 7a fe ff ff 48 89 RSP: 0018:ffffc90014b4f520 EFLAGS: 00010293 RAX: ffffffff85528fbd RBX: 000000575e44d3d5 RCX: ffff888078928000 RDX: 0000000000000000 RSI: 000000575e44d3d5 RDI: 000000575e44d3d5 RBP: ffffc90014b4f6c0 R08: ffffffff85528f29 R09: 0000000000000000 R10: ffffc900151d4000 R11: 0000000000000000 R12: 000000575e44d3d5 R13: 1ffff92002969ed8 R14: 0000000000000000 R15: ffff88801f700000 FS: 00007fa6168fc700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4e25bad988 CR3: 00000000274f2000 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:877 [inline] drm_crtc_next_vblank_start+0x229/0x460 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+0x277/0x8d0 drivers/gpu/drm/drm_atomic_helper.c:1584 drm_atomic_helper_commit+0x627/0xbc0 drivers/gpu/drm/drm_atomic_helper.c:2013 drm_atomic_commit+0x279/0x2c0 drivers/gpu/drm/drm_atomic.c:1503 drm_client_modeset_commit_atomic+0x676/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1045 drm_client_modeset_dpms+0x184/0x8b0 drivers/gpu/drm/drm_client_modeset.c:1226 drm_fb_helper_blank+0x1be/0x200 fb_blank drivers/video/fbdev/core/fbmem.c:1088 [inline] do_fb_ioctl+0x4f5/0x8f0 drivers/video/fbdev/core/fbmem.c:1180 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa615c8c169 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:00007fa6168fc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fa615dabf80 RCX: 00007fa615c8c169 RDX: 0000000000000000 RSI: 0000000000004611 RDI: 0000000000000003 RBP: 00007fa615ce7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc35987e1f R14: 00007fa6168fc300 R15: 0000000000022000