599334 - This page will slow down Firefox

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Hikari Chan]

User-Agent:       Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729)
Build Identifier: 4.0b7

Move the mouse cursor to the left menu table, the popup menus will slow down the firefox window. However, before 4.0b1 or previous version, it is correct.

Reproducible: Always

Steps to Reproduce:
1.open this page
2.move mouse cursor to the left menu table
3.wait a few seconds
4.before leave this page, it will happen again.
Actual Results:  
There is not any waiting for this page. Please refer to 4.0b1 or previous version, or any versions of MS I.E.

Comment 1

[Matthias Versen [:Matti]]

confirming with SM trunk (get a slow script warning) and FF4.0b6 on win32
I will try to find a regression range

Comment 2

[Matthias Versen [:Matti]]

Last good nightly: 2010-07-14 First bad nightly: 2010-07-15

Pushlog: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=1a107c990c
89&tochange=5355f245b916

Comment 3

[Boris Zbarsky [:bzbarsky]]

So... Are you sure about that pushlog range?  I get the day after that:

http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5355f245b916&tochange=5fda39cd703c

And unlike your range, mine has a tracemonkey merge in it, and the hang is in js engine code according to my profiler.

I'll see if I can bisect on tracemonkey.

Comment 4

[Matthias Versen [:Matti]]

I'm sorry, I was in hurry because i had to go to work and I couldn't verify the range manually. I used the regression.py script the first time and it seems to cause a off-by-one error on my installation. I need apparently a break from this QA work :-(

Comment 5

[Boris Zbarsky [:bzbarsky]]

Hmm.  Bisect says:

The first bad revision is:
changeset:   46291:dd6799cad9a4
user:        Blake Kaplan <[e-mail]>
date:        Mon Jun 28 16:39:00 2010 -0700
summary:     Bug 574517 - Separate the inner and outer windows' JS classes. r=jst

Also, it looks like the broken builds have this error:

  JavaScript error: http://www.pconline.com.cn/ssi/js/bjk/index.html, line 259:
  c.apply is not a function

which working builds seem to not have....

Comment 6

[Andreas Gal :gal]

Can we get some qa support and capture the page?

Comment 7

[Matt]

Attachment: Full testcase zipped

Comment 8

[Matt]

Attachment: Reduced testcase

Mouse over the text and it should hang.

Mozilla/5.0 (Windows NT 6.1; rv:2.0b7pre) Gecko/20100927 Firefox/4.0b7pre

Comment 9

[Blake Kaplan (:mrbkap) (inactive)]

This worksforme. Please re-open if you still see this.