1195037 - XMLHttpRequest causes high CPU use and incorrect shutdown after timeout

Status: RESOLVED DUPLICATE of bug 1199957

(Core :: Networking: HTTP, defect)

Description

[aleth [:aleth]]

In Thunderbird, an XMLHttpRequest from chrome code of the form
    let request = new XMLHttpRequest();
    request.open("GET", url);
    request.onload = function () {...};
    request.onerror = () => {...};
    request.ontimeout = () => {...};
    request.onloadend = function() {...};
    request.timeout = 15000;
    request.send(null);
correctly calls ontimeout() followed by onloadend() when it timeouts. 

However, it seems something sticks around, as I see CPU usage going up to around 100%, and when the app is quit, it does not shut down correctly. Instead it hangs until force-quit (OS X).

Any ideas as to what is going on here?

Comment 1

[aleth [:aleth]]

PS. I don't think the test content/base/test/test_XHR_timeout.html can capture this behaviour, as the server faked by content/base/test/file_XHR_timeout.sjs will always close on its own after 3s.

Comment 2

[aleth [:aleth]]

(In reply to aleth [:aleth] from comment #1)
> PS. I don't think the test content/base/test/test_XHR_timeout.html can
> capture this behaviour, as the server faked by
> content/base/test/file_XHR_timeout.sjs will always close on its own after 3s.

(now lives in dom/base/test of course)

Comment 3

[aleth [:aleth]]

This appears to have been due to the patch landed in Bug 1170646, which has now been backed out.