Double hash stream read causes test to fail

When I run nodeunit on the following code:

``` javascript
var crypto = require('crypto');

exports.wtf = function(test) {

var hash1 = crypto.createHash('sha256');
var hash2 = crypto.createHash('sha256');

hash2.on('readable', function() {
hash2.read(4); // comment this line and test passes
test.done();
});

hash1.pipe(hash2);
hash1.end(new Buffer(1000));
};
```

it fails with the error "TypeError: Cannot read property'setup' of undefined". If I comment out the indicated line, the test passes.

This is with node v0.10.6 and nodeunit 0.8.0 on Windows 8.