oven-sh/bun · error

RtlGenRandom failed

Error message

RtlGenRandom failed

What it means

Error "RtlGenRandom failed" thrown in oven-sh/bun.

Source

Thrown at src/bun_core/util.rs:2754

            // SAFETY: chunk is a valid writable slice ≤ 256 bytes.
            let rc = unsafe { libc::getentropy(chunk.as_mut_ptr().cast(), chunk.len()) };
            if rc != 0 {
                panic!("getentropy failed");
            }
        }
    }
    #[cfg(windows)]
    {
        unsafe extern "system" {
            // advapi32!SystemFunction036 a.k.a. RtlGenRandom — what BoringSSL uses on Windows.
            #[link_name = "SystemFunction036"]
            fn RtlGenRandom(buf: *mut u8, len: u32) -> u8;
        }
        for chunk in bytes.chunks_mut(u32::MAX as usize) {
            // SAFETY: chunk fits in u32; RtlGenRandom writes exactly that many bytes.
            let ok = unsafe { RtlGenRandom(chunk.as_mut_ptr(), chunk.len() as u32) };
            if ok == 0 {
                panic!("RtlGenRandom failed");
            }
        }
    }
}

// ── self_exe_path ─────────────────────────────────────────────────────────
// Memoized into a process-lifetime
// static buffer; thread-safe via `Once`. Returns a `&'static ZStr`.
pub fn self_exe_path() -> crate::CrateResult<&'static ZStr> {
    static CELL: Once<crate::CrateResult<ZBox>> = Once::new();
    let r = CELL.get_or_init(|| {
        let path = std::env::current_exe().map_err(|_| crate::CrateError::Unexpected)?;
        // Symlink resolution: Rust's
        // `current_exe()` already resolves on Linux (`readlink /proc/self/exe`),
        // but on Darwin it returns the raw `_NSGetExecutablePath` result and on
        // Windows it returns the raw `GetModuleFileNameW` result — neither
        // realpaths, so a symlinked argv0 (Darwin) or an un-normalized
        // `C:\a\.\b\bun.exe` load path (Windows) leaks through to

View on GitHub (pinned to 8c5296ac45)

When it happens

Trigger: Thrown at src/bun_core/util.rs:2754 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of oven-sh/bun@8c5296ac45 (2026-08-16). Data as JSON: /api/errors/f1fc8967446643c2. Report an issue: GitHub.