692604 - Repeated browser freeze while searching large page

Status: RESOLVED WONTFIX

(Toolkit :: Find Toolbar, defect, P5)

Description

[Jonathan Makela]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20100101 Firefox/8.0
Build ID: 20110928060149

Steps to reproduce:

Steps to reproduce:
1. open http://modsbylaz.hugelaser.com/uniques_tiered.html in a new tab
2. wait for page to load
3. enter "ctrl+f" to bring up search
4. While at the top of the page, enter a single character ("b".) Firefox should function correctly. Enter the rest of the word ("boulder".)
5. Clear the search box
5. After the GUI is responsive again, finish entering the term (continuing from earlier, "boulder".) This will succeed without a freeze.
6. Remaining at the bottom of the page, clear the search box and enter something new ("b" again.) The GUI will freeze. Continuing to enter "boulder" once the GUI is responsive will work without pause. Clearing the search box again and entering something such as "wardance" (a term found at the top of the page) while remaining at the bottom of the page will exhibit the exact same behavior. Note that clearing the search box and entering the same search will repeat the behavior.

Environment: 7.0 & 8.0 beta on windows 7 64bit (not 64bit browser AFAIK)


Actual results:

While at the bottom of a long page, the first character of a search (when Firefox finds the first instance of that character on your visible screen) will cause Firefox to hang at max CPU usage for a time that appears to be proportional to the number of instances of that character on the page. "a", with 26344 appearances on that page, will take significantly longer than "b", with 4287 appearances. These counts ignore HTML tags and are taken from the counter at http://larry.israel.name/webdev/letterfrequency.html.

I'm not sure why it is only the first character entered that exhibits this behavior.


Expected results:

Firefox should not freeze for as long as it does.

Comment 1

[Tim (fmdeveloper)]

WFM - Mozilla/5.0 (Windows NT 5.1; rv:10.0a1) Gecko/20111006 Firefox/10.0a1 ID:20111006030949

Does the issue still occur if you start Firefox in Safe Mode? http://support.mozilla.com/en-US/kb/Safe+Mode

How about with a new, empty profile? http://support.mozilla.com/en-US/kb/Basic%20Troubleshooting#w_8-make-a-new-profile

Does the issue occur with the latest nightly? http://nightly.mozilla.org/

Comment 2

[Jonathan Makela]

(In reply to Tim (fmdeveloper) from comment #1)
> WFM - Mozilla/5.0 (Windows NT 5.1; rv:10.0a1) Gecko/20111006 Firefox/10.0a1
> ID:20111006030949
> 
> Does the issue still occur if you start Firefox in Safe Mode?
> http://support.mozilla.com/en-US/kb/Safe+Mode
> 
> How about with a new, empty profile?
> http://support.mozilla.com/en-US/kb/Basic%20Troubleshooting#w_8-make-a-new-
> profile
> 
> Does the issue occur with the latest nightly? http://nightly.mozilla.org/

Bug was present for me in nightly 10.0a1 with safe mode and a new profile.

Apologies for duplicate content in original bug report, I don't submit many bug reports.


I modified the procedure and it looks like I messed it up - the 2nd step 5 should have been deleted. The bug is not present when searching from the top of the page, only when at/near the bottom.

Comment 3

[Tim (fmdeveloper)]

OK - I was able to reproduce on Mozilla/5.0 (Windows NT 5.1; rv:10.0a1) Gecko/20111006 Firefox/10.0a1 ID:20111006030949

Steps to Reproduce:

Go to http://modsbylaz.hugelaser.com/uniques_tiered.html
After page load search for boulder
Clear find entry
Type b
Firefox freezes

Comment 4

[Alice0775 White]

Attachment: Semi-Reduced html

I can reproduce with STR in comment#3.

And This hang happens on Firefox 1.0.8 to Nightly10.0a1 as well.
(I did not try with version prior to 1.0.8)

Comment 5

[Alice0775 White]

Attachment: WinDbg log

Comment 6

[Henrik Skupin [:whimboo][⌚️UTC+2]]

How long does Firefox freeze for you Jonathan and Tim? In my case on OS X it's for about 10s until I get control again.

Comment 7

[Jonathan Makela]

(In reply to Henrik Skupin (:whimboo) from comment #6)
> How long does Firefox freeze for you Jonathan and Tim? In my case on OS X
> it's for about 10s until I get control again.

That sounds about right. It freezes for longer when searching for a more common letter such as "a".

Comment 8

[Henrik Skupin [:whimboo][⌚️UTC+2]]

That really reminds me on another bug. Not sure if that one has already been fixed. Graeme, what do you think?

Comment 9

[BugBot [:suhaib / :marco/ :calixte]]

In the process of migrating remaining bugs to the new severity system, the severity for this bug cannot be automatically determined. Please retriage this bug using the new severity system.

Comment 10

[Neil Deakin]

The page no longer has this behaviour and has likely changed in the meantime, so let's close this for now.