610386 - Browser freezes appending to <select>

Status: RESOLVED DUPLICATE of bug 607856

(Core :: Layout: Form Controls, defect)

Description

[Alistair Vining]

Attachment: Reduced testcase

(Component / summary is just a guess)

Mozilla/5.0 (Windows NT 5.1; rv:2.0b8pre) Gecko/20101108 Firefox/4.0b8pre

Visiting the linked URL or the reduced testcase in a current nightly build pegs the CPU at 100% for 3 minutes, whereas IE8 takes < 1 sec.

This is a slow PC, but it's not normally *that* slow, and I seem to be experiencing > 20 second hangs all over the web at the moment which may be related.

As far as I can see (I'm not a jQuery guru) it loops over about 190 <option> elements inside one <select> and appends them to another <select>.

Notes: non-SSE2 processor, therefore no methodjit.  No accelerated gfx.  Extensions disabled.

Comment 1

[Mounir Lamouri (:mounir)]

Tested in 3.6 and trunk, no hangs observed.

Does this happen in 3.6 too?

Comment 2

[Boris Zbarsky [:bzbarsky]]

> Notes: non-SSE2 processor, therefore no methodjit.

Mounir, do you see the problem if you disable methodjit?

If so, sounds like bug 607856 to me.

Comment 3

[Mounir Lamouri (:mounir)]

Indeed, I wasn't careful enough and it doesn't work with methodjit disabled.

Marking as a duplicate of bug 607856 for the moment.
Alistair, feel free to reopen if this isn't fixed when bug 607856 is fixed.