Bug 1324584

Summary: [GCC6][Disabled JIT] Firefox 45.0 spice-html5 performance makes it unusable. Regression
Product: [Fedora] Fedora Reporter: Oliver Gutiérrez <ogutierr>
Component: firefoxAssignee: Martin Stransky <stransky>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 24CC: aruizrui, elad, gecko-bugs-nobody, jakub, jhorak, ogutierr, pjasicek, stransky
Target Milestone: ---   
Target Release: ---   
Hardware: Unspecified   
OS: Linux   
URL: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70526
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-08-08 14:10:50 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Oliver Gutiérrez 2016-04-06 17:21:26 UTC
Description of problem:

Firefox freezes intermitently when using spice-html5 on a tab

Version-Release number of selected component (if applicable): Fedora 24, Firefox 45.0, spice-html5 master branch


How reproducible: Always

Steps to Reproduce:
1. Open example spice-html5 client in firefox and 
2. Connect to an spice machine

Actual results:
Firefox freezes and becomes very slow and unresponsive

Expected results:
Firefox working as in Fedora 23

Comment 1 Martin Stransky 2016-04-06 18:49:54 UTC
Do you use Wayland or X session?

Comment 2 Oliver Gutiérrez 2016-04-07 07:47:06 UTC
It happens in X session, both on my development machine, updated from Fedora 23 and a new clean machine install from Fedora alpha iso without any modifications.

Comment 3 Martin Stransky 2016-04-07 12:03:17 UTC
This an incarnation of https://bugzilla.mozilla.org/show_bug.cgi?id=1245783 - we have to disable JS JIT engine because of the gcc6 miscompilation. So js code is extremely slow here.

Comment 4 Martin Stransky 2016-04-08 10:52:16 UTC
Jakub, is it possible to backport https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70526 to Fedora gcc package? Thanks.

Comment 5 Jakub Jelinek 2016-04-08 10:57:15 UTC
Do you mean to GCC 6 or GCC 5?
For GCC 6, gcc-6.0.0-0.20.fc{24,25} should have it already, except that it is still building (for almost 2 days!!!) on the slooooooooooooooooooooow armv7hl.
This arch should never been primary!

Comment 6 Martin Stransky 2016-04-08 11:06:00 UTC
Thanks, I may try it build locally then. I mean gcc6, Fedora 24 and rawhide. If the bug also affects gcc5 it may not be a cause of the JIT crashes...but let's see.

Comment 7 Fedora End Of Life 2017-07-25 20:29:31 UTC
This message is a reminder that Fedora 24 is nearing its end of life.
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Comment 8 Fedora End Of Life 2017-08-08 14:10:50 UTC
Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is
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