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I'm on OSX 10.8.4, x86_64, latest Rust on master. And to head off any concerns about my file handle limits:
$ ulimit
unlimited
I ran into this when stress-testing my web sockets library. After just a couple hundred connections, some connections were being refused at random. The only thing I could see was some output with RUST_LOG=debug saying (libuv) kqueue(): Too many open files. I've come up with a smaller test case that brings this out with some spectacular errors:
use std::io::net::tcp::{TcpListener, TcpStream};
use std::io::net::ip::{Ipv4Addr, SocketAddr};
use std::io::{Acceptor, Listener};
use std::io::IoResult;
fn main() {
let addr = SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: 8989 };
spawn(proc() {
let mut acceptor = TcpListener::bind(addr).listen();
loop {
let mut stream = match acceptor.accept() {
Ok(stream) => stream,
Err(error) => {
debug!("accept failed: {:?}", error);
continue;
}
};
println!("{:?}", stream.read_byte().unwrap());
}
});
for _ in range(0, 1000) {
spawn(proc() {
match TcpStream::connect(addr) {
Ok(stream) => {
let mut stream = stream;
stream.write([1]);
let mut buf = [0];
stream.read(buf);
},
Err(e) => debug!("{:?}", e)
}
});
}
}
Fails less often with 100-200 connections. The errors are different every time I run this with RUST_LOG=debug.
Here's the end of one run:
(libuv) kqueue(): Too many open files
bug(54921,0x10881c000) malloc: *** error for object 0x7fca4b620f70: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
std::io::IoError{kind: OtherIoError, desc: "too many open files", detail: None}
task '<unnamed>' failed at 'assertion failed: `(left == right) && (right == left)` (left: `140506823655696`, right: `140506824839680`)', /Users/harish/rust/rust/src/librustuv/homing.rs:110
(libuv) kqueue(): Too many open files
std::io::IoError{kind: OtherIoError, desc: "too many open files", detail: None}
task '<unnamed>' failed at 'didnt want an unwind during: going home', /Users/harish/rust/rust/src/librustuv/lib.rs:199
Abort trap: 6
Another:
task '<unnamed>' failed at 'didnt want an unwind during: going home', /Users/harish/rust/rust/src/librustuv/lib.rs:199
task failed during unwinding (double-failure - total drag!)
rust must abort now. so sorry.
Segmentation fault: 11
Another:
task '<unnamed>' failed at 'didnt want an unwind during: going home', /Users/harish/rust/rust/src/librustuv/lib.rs:199
task failed during unwinding (double-failure - total drag!)
rust must abort now. so sorry.
Illegal instruction: 4
And lastly:
fatal runtime error: leaked managed memory (140518327703008 objects)
(libuv) kqueue(): Too many open files
task '<unnamed>' failed at 'didnt want an unwind during: going home', /Users/harish/rust/rust/src/librustuv/lib.rs:Abort trap: 6
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