319988 - Firefox hangs executing JavaScript Speed Test 1.0

Status: VERIFIED DUPLICATE of bug 190147

(Core :: JavaScript Engine, defect)

Description

[Greg K.]

Attempting to execute any of this site's JavaScript Speed Tests causes Gecko/20051210 Firefox/1.6a1 to hang. It also hangs Firefox 1.5 and Camino 1.0b1.

For now I'll attach a Sampler report. The page and script likely need further triage and reduction, so adding qawanted.

Comment 1

[Greg K.]

Attachment: Sampler data from Gecko/20051210 Firefox/1.6a1 during execution of JavaScript Speed Test 1.0

Comment 2

[Bob Clary [:bc] (inactive)]

Its not a hang in the true sense. The script will finish if you wait long enough... in my case about >300 seconds. IE "hangs" as well but only for 30 seconds or so. 

I think the issue here is the appending of text to the textarea value which makes this a dom performance bug. Probably a dupe of bug 190147.

Comment 3

[Greg K.]

Also reproduced using FF 1.5 on Win XP. Setting All/All and modifying Severity and Keywords per comment 2.

Comment 4

[Wayne Mery (:wsmwk)]

(In reply to comment #2)
> Its not a hang in the true sense. The script will finish if you wait long
> enough... in my case about >300 seconds. IE "hangs" as well but only for 30
> seconds or so. 

hangs for me - it never came back.
at 3 minutes taskmgr indicated "not responding".
at 7 minutes I killed the task.
as mentioned, IE comes aback in less than 30 sec.

Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8) Gecko/20051111 Firefox/1.5  p4 3.2 (similar results for suite trunk build)

Comment 5

[Brendan Eich [:brendan]]

So is this a dup of bug 190147?  Someone do poor-man's-profiling (ctrl-C or break in a debugger a bunch of times during the hang and see where stack backtraces tend to cluster).

/be

Comment 6

[Bob Clary [:bc] (inactive)]

*** This bug has been marked as a duplicate of 190147 ***

Comment 7

[Boris Zbarsky [:bzbarsky]]

In case anyone still cares, profiling data shows:

Total hit count: 515441
486137 nsHTMLTextAreaElement::SetValue
 28222 nsHTMLTextAreaElement::GetValue

So this is indeed a duplicate of bug 190147.  Note that the actual time spent in the JS engine here is at most (515441 - 486137 - 28222) = 1082.  Which is about 0.2% of the total.