###!!! ASSERTION: we rather crash than hang: '!(mState & XML_HTTP_REQUEST_SYNCLOOPING)', file mozilla/extensions/xmlextras/base/src/nsXMLHttpRequest.cpp, line 282 What does "we rather crash than hang" mean, anyway? That string appears in Mozilla source several times.

The testcase has to be loaded from a file: URL to produce the assertion.

Hmm, so it didn't crash? It was supposed to... I remember we put these things in the code in situations that should not happen, but if it ever did happen the app would crash and we might get a talkback report. With hang there is no talkback. So, crashing seemed the best course of action.

This still happens on trunk (with the testcase loaded from a file: URL).

SOAP is no longer built by default, so this doesn't affect Firefox any more. (SOAP support was dropped in bug 332174.)

I'm also seeing this assertion when xmlhttprequest is used on a non-existing file.

The assertion seems to be delayed, it comes up after 10 seconds or so.

I get a security exception when I load testcase2 as a local file.

Btw, I have never seen this crash *or* hang. But it's an NS_ABORT_IF_FALSE, which means it will abort soon if bug 429930 is fixed (in debug builds only).

I think this code is totally gone now. http://mxr.mozilla.org/mozilla-central/search?string=WSDLLoader