1257906 - Abort network loads on shutdown to prevent hangs in sync XHR from unload

Status: RESOLVED WONTFIX

(Core :: DOM: Core & HTML, defect, P3)

Description

[Benoit Girard (:BenWa)]

This bug was filed from the Socorro interface and is 
report bp-ccc41702-dea7-4db7-8685-3a3462160311.
=============================================================

Looking at this report we're the website is doing a sync XHR from the unload event on shutdown. Hitting the network can take an arbitrary amount of time. This causes us to hit the shutdownhang code before the user has a tab that force an XHR request on shutdown.

We should consider giving website a budget for how much time they can spend in their unload before we move on. Ideally this would be a subset of the shutdownhang trigger time so that we can survive having at least a few bad apples before we take down the browser.

Comment 1

[Benoit Girard (:BenWa)]

khuey mentions that:
1) Web workers have some kind script timeout on shutdown.
2) We could abort network loads on shutdown.

Comment 2

[Benoit Girard (:BenWa)]

Here's the relevant Web worker code:
http://mxr.mozilla.org/mozilla-central/source/dom/workers/WorkerFeature.h?rev=8dcf83e85d98#38

Comment 3

[Andrew Overholt [:overholt]]

Should we morph this into the budget or timeout ideas?

Comment 4

[Kyle Huey (Exited; not receiving bugmail, old account, do not use)]

Sure, why not.

Comment 5

[Sylvestre Ledru [:Sylvestre]]

Closing because no crash reported since 12 weeks.