oven-sh/bun · error

getentropy failed

Error message

getentropy failed

What it means

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

Source

Thrown at src/bun_core/util.rs:2739

            };
            if rc < 0 {
                let err = crate::ffi::errno();
                if err == libc::EINTR {
                    continue;
                }
                panic!("getrandom failed: errno {err}");
            }
            filled += rc as usize;
        }
    }
    #[cfg(any(target_os = "macos", target_os = "ios", target_os = "freebsd"))]
    {
        // getentropy caps at 256 bytes per call.
        for chunk in bytes.chunks_mut(256) {
            // 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");
            }
        }
    }

View on GitHub (pinned to 8c5296ac45)

When it happens

Trigger: Thrown at src/bun_core/util.rs:2739 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/44bc43a655369c32. Report an issue: GitHub.