499981 - Reproducible FF3.5 CPU hang with http but not https on Windows

Status: RESOLVED DUPLICATE of bug 477564

(Firefox :: General, defect)

Description

[manicminer1982]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.1) Gecko/20090616 Firefox/3.5 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.1) Gecko/20090616 Firefox/3.5 (.NET CLR 3.5.30729)

I am seeing a problem only on Easynews with Firefox 3.5 RC1
(was also in b4 which was the first 3.5 I tried). When you
browse the indexes or even just any long list such as
http://members.easynews.com/index.html?search=pictures|images if
you scroll up/down for a few seconds the browser hangs with
"not responding" and the CPU usage goes to 50% on a HT/dual
core. Have seen this on Vista SP2 and Windows 2003 SP2.

I have tried safe mode, disabling add-ons etc. I have tried on a completely different/"fresh" PCs and in VMs. The problem does NOT exist in FF3.0.x or IE7/8.

I dont think its a Javascript issue as I have tried with NoScript blocking and it still hangs. The only difference seems to be that if you use the SSL interface there is no problem, which suggests to me some pipelinging/config/cache issue difference, but I havent narrowed it any further.

Easynews would probably be helpful if a test account is needed.


Reproducible: Always

Steps to Reproduce:
1. Go to URL in example
2. Watch page load, then watch CPU usage shoot up
3. Try to use Firefox and it hangs with "not responding" for 30 secs at least on a dual core machine, longer on slower processors.


Expected Results:  
Page should load normally as it does using SSL version - https://secure.members.easynews.com/index.html?search=pictures|images

Comment 1

[Ria Klaassen (not reading all bugmail)]

Can you test this also in safe-mode or else with a new profile and report back:
http://support.mozilla.com/en-US/kb/Safe+Mode
http://support.mozilla.com/en-US/kb/Basic+Troubleshooting#Make_a_new_profile

Comment 2

[manicminer1982]

(In reply to comment #1)
> Can you test this also in safe-mode or else with a new profile and report back:
> http://support.mozilla.com/en-US/kb/Safe+Mode
> http://support.mozilla.com/en-US/kb/Basic+Troubleshooting#Make_a_new_profile

As I mentioned I have tried safe-mode - and I have tried on machines running FF3.0 (working okay) and upgraded them to 3.5 and still seeing the problem. I will try a new profile, though effectively all my test PCs are new profiles.

Comment 3

[Marcia Knous [:marcia]]

manicminer: This is tough for me to repro since the easynews site requires a paid subscription (the free trial no longer applies).

Comment 4

[manicminer1982]

I have already spoken to Easynews who said they would be happy to give a Mozilla dev a test account if I send them an email with a name. I am going to do a couple more tests tomorrow but whoever wants the test account sent to them just put your hand up :)

Comment 5

[Kevin Brosnan]

I ran into another easynews user on irc. He posted some example pages [warning NSFW] 

http://occupant2012.googlepages.com/pr0n.html
http://occupant2012.googlepages.com/ngindex.html

I de-porned and created a php script to spit out a similar page
1000 check boxes http://www.kevinbrosnan.net/tmp/easynews2.php
750 newsgroup listings similar to the original pages http://www.kevinbrosnan.net/tmp/easynews.php

Given the pages above Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1pre) Gecko/20090623 Shiretoko/3.5pre hangs badly, Both mardeg and I had hangs of 10s of min. 3.0.11 renders the page in a reasonable amount of time.

Comment 6

[Kevin Brosnan]

Attachment: original easynews page examples

Make sure these don't get lost. These are NSFW.

Comment 7

[Ria Klaassen (not reading all bugmail)]

(In reply to comment #5)

> 1000 check boxes 

Maybe Bug 477564 ?

Comment 8

[Kevin Brosnan]

Minefield builds
quick 20080905
hang 20090906

Old style about:buildconfig
Best guess hg changeset http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=caf20bfc575e&tochange=5cb6b3b6af82

Comment 9

[Kevin Brosnan]

(In reply to comment #7)

I agree based on regression range,

Comment 10

[manicminer1982]

Just in case its been missed - if you load the same page over an SSL connection it doesnt have any problems...