astrid-runtime/astrid · error

WinFsp mountpoint did not become ready within {} seconds: {}

Error message

WinFsp mountpoint did not become ready within {} seconds: {}

What it means

wait_for_mountpoint_ready loops (25 ms sleeps) until the mountpoint metadata shows a directory, bounded by MOUNTPOINT_READY_TIMEOUT. If the WinFsp mount never materializes as a browsable directory within the timeout, the function bails with the elapsed seconds and the path. It signals the mount failed to come up rather than hanging forever.

Source

Thrown at crates/astrid-storage-provider-winfsp/src/win.rs:123

        // rather than inspecting the junction object itself.
        match std::fs::metadata(mountpoint) {
            Ok(metadata) if metadata.is_dir() => return Ok(()),
            Ok(_) => bail!(
                "WinFsp mountpoint is not a directory: {}",
                mountpoint.display()
            ),
            Err(error) if error.kind() == std::io::ErrorKind::NotFound => {},
            Err(error) => {
                return Err(error).with_context(|| {
                    format!(
                        "inspect WinFsp mountpoint readiness {}",
                        mountpoint.display()
                    )
                });
            },
        }
        if started.elapsed() >= MOUNTPOINT_READY_TIMEOUT {
            bail!(
                "WinFsp mountpoint did not become ready within {} seconds: {}",
                MOUNTPOINT_READY_TIMEOUT.as_secs(),
                mountpoint.display()
            );
        }
        std::thread::sleep(Duration::from_millis(25));
    }
}

#[derive(Debug, serde::Deserialize, serde::Serialize)]
#[serde(rename_all = "kebab-case", tag = "operation", deny_unknown_fields)]
enum ServiceControlRequest {
    /// Probe service state with the broker bearer.
    Status { token: String },
    /// Stop and unmount the private service.
    Stop { token: String },
}

View on GitHub (pinned to affd8760f4)

Solutions

1. Verify WinFsp is installed and the version matches the crate's requirement (check C:\Program Files (x86)\WinFsp)
2. Capture and inspect the daemon/service stderr for the earlier failure that prevented the mount
3. Increase MOUNTPOINT_READY_TIMEOUT if the environment is slow (rebuild the crate)
4. Test the same mount manually with winfsp-x.dll test tools or `net use` to isolate driver vs. app issues

Example fix

// before
const MOUNTPOINT_READY_TIMEOUT: Duration = Duration::from_secs(5);
// after
const MOUNTPOINT_READY_TIMEOUT: Duration = Duration::from_secs(30);

// verify WinFsp is present before mounting
if !Path::new("C:\\Program Files (x86)\\WinFsp\\bin\\winfsp-x64.dll").exists() {
    return Err("WinFsp driver not installed".into());
}

fn mountpoint_became_dir(p: &Path, timeout: Duration) -> bool {
    let start = std::time::Instant::now();
    while start.elapsed() < timeout {
        if std::fs::metadata(p).map(|m| m.is_dir()).unwrap_or(false) { return true; }
        std::thread::sleep(Duration::from_millis(25));
    }
    false
}

match mount_err {
    Err(e) if e.to_string().contains("did not become ready") => {
        // capture daemon stderr, check WinFsp install, then retry once with longer timeout
        collect_daemon_logs()?;
        retry_mount_with_timeout(Duration::from_secs(60))?;
    }
    other => other?,
}

When it happens

Trigger: The WinFsp filesystem failed to start or register the junction (driver missing, service start failure, invalid filesystem parameters), so the poll sees only NotFound until the timeout elapses.

Common situations: WinFsp driver not installed or wrong version; the FSD/security descriptor rejected the mount; the daemon crashed after launching; slow system startup exceeding the configured timeout on heavily loaded machines.

Understand the failure class

Background: Request timed out: what client-side request timeouts mean across libraries (Request timed out, TIMED_OUT, APITimeoutError) — this error's family across 39 libraries.

Related errors

• no free Windows drive target is available; specify a directo
• WinFsp mountpoint is not a directory: {}
• WinFsp control endpoint remained live after stop
• WinFsp failed to start mount with status {status:#x}
• WinFsp failed to start private mount: {status:#x}

AI-assisted analysis of astrid-runtime/astrid@affd8760f4 (2026-09-09). Data as JSON: /api/errors/4e0554746602c5e7. Report an issue: GitHub.