467846 - Memory balloons disproportionally to the size of text file being opened

Status: NEW

Description

[Bill Broadley]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/2008111318 Ubuntu/8.10 (intrepid) Firefox/3.0.4
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.4) Gecko/2008111318 Ubuntu/8.10 (intrepid) Firefox/3.0.4

Do not load if you aren't ready for firefox to hit 1.2GB.

To replicate:
mv .mozilla .mozilla-backup # insure it's a vanilla firefox config

Go to this url
http://www.archive.org/stream/titlelistofdocum024685mbp/titlelistofdocum024685mbp_djvu.txt

At least on ubuntu intrepid firefox process will increase to 1.2GB or so.

You should get a 4.9MB file, with a big block of <pre>.  It looks like OCR'd text and there happens to be a <b in it.  Replacing <pre> with <xmp> fixes it.

The missing </html> and </body> seem to have no effect, behavior does not change when I add them.

So basically I think firefox is trying to handle a <b ... > tag that is 100k lines long or something.  In any case this results in an unusable browser on any system with <= 1GB ram.  Even on a 2GB ram system it takes a few minutes of a non-responsive firefox to recover.

Reproducible: Always

Steps to Reproduce:
1. mv .mozilla .mozilla.backup # insure vanilla install
2. http://www.archive.org/stream/titlelistofdocum024685mbp/titlelistofdocum024685mbp_djvu.txt

Actual Results:  
Firefox downloads a 4.9MB page and expands to a process size of 1.2GB.

Expected Results:  
Process should not increase to 1.2GB, something like 100MB or less would be much more reasonable.


I opened bug on ubuntu as well:
https://bugs.launchpad.net/ubuntu/+source/firefox-3.0/+bug/304942

Comment 1

[Damian Shaw [Quan]]

This might be a regression, needs testing against Firefox 2, it's certainly behind in performance compared to other browsers.

Comment 2

[Jim Jeffery not reading bug-mail 1/2/11]

Also seeing this in Vista HP SP1 using the latest trunk builds:

Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2a1pre) Gecko/20081203 Minefield/3.2a1pre Firefox/3.0.4 ID:20081203114922

Comment 3

[Alexander Sack]

most likely dupe of bug 330029 or some other memory DoS

Comment 4

[Damian Shaw [Quan]]

Not a regressions. 

Alexander Sack: The bug still occurs with Javascript disabled, is that expected?

Comment 5

[Bill Broadley]

bug 330029 is a DoS based on javascript, this bug is triggered on a page
without javascript.

Comment 6

[Damian Shaw [Quan]]

o.k, my mistake, I assumed it was the large text on the file because opening text files of such magnitude causes memory size to balloon as well, but not quite of the same magnitude.