785595 - gmail stuck on "Loading" page if javascript.options.methodjit_always=true

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Chris Peterson [:cpeterson]]

Starting with Nightly 17.0a1 (2012-08-24), I can no longer log into gmail if javascript.options.methodjit_always=true. I disabled all my addons when testing.

STR:
1. In about:config, set javascript.options.methodjit_always=true
2. Try to log into gmail.
3. See that gmail is stuck on "Loading" page
4. In about:config, reset javascript.options.methodjit_always to default value false
5. Reload gmail and it loads correctly


I bisected the tinderbox builds between Nightly builds 8-23 and 8-24. I believe the regression is in this merge:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5650196a8c7d&tochange=198ca6edd0ae

Comment 1

[David Anderson [:dvander] - inactive, e-mail if emergency]

Though this is a valid bug, I recommend not turning that option on. It's meant to aggressively stress test certain aspects of the compiler and at best will just uncover strange bugs and make performance much worse.

Comment 2

[Chris Peterson [:cpeterson]]

This regression was caused by bug 778724:
https://hg.mozilla.org/mozilla-central/rev/bf07c6253287

Comment 3

[Chris Peterson [:cpeterson]]

I can no longer repro this gmail login problem, even with older builds. I assume the content has changed and no longer hits the problem.