860478 - When loading long page, Firefox may hang with 100% CPU load forever

Status: REOPENED

(Core :: General, defect)

Description

[Michael Hohner]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:20.0) Gecko/20100101 Firefox/20.0
Build ID: 20130326150557

Steps to reproduce:

Load long page, e.g. http://www.whatwg.org/specs/web-apps/current-work/

While FF is still loading, start scrolling with the mouse wheel.


Actual results:

FF hangs forever with 100% CPU load


Expected results:

FF should just scroll what it has loaded

Comment 1

[(mostly gone) XtC4UaLL [:xtc4uall]]

Confirmed with Mozilla/5.0 (Windows NT 6.1; WOW64; rv:23.0) Gecko/20130412 Firefox/23.0 ID:20130412030828 CSet: 7b8ed29c6bc0 though I think there are/were existing Perf Bugs regarding that Site.

SPS nevertheless: http://people.mozilla.com/~bgirard/cleopatra/#report=8852eac5a3dfe0100148e9d86d71004045464ae2

Comment 2

[Boris Zbarsky [:bzbarsky]]

The problem seems to be all the flushing the mouse scroll does, forcing us to not batch any of the layout work....

Comment 3

[Michael Hohner]

Problem does not occur any longer with FF 36.

Comment 4

[Flore Allemandou [:flore]]

Closing this bug according to reporter's latest comment

Comment 5

[(mostly gone) XtC4UaLL [:xtc4uall]]

reoping due to nothing changed since comment 1

Comment 6

[Stavros Korokithakis]

I got the same bug on this URL:

kissanime.ru/Anime/Mob-Psycho-100/Episode-001?id=127641

CNR with FF 51.0a2. This was happening before yesterday, though.

Comment 7

[Boris Zbarsky [:bzbarsky]]

Stavros, I just tried loading that link (in a current nightly) and I can't reproduce the hang you say you see.

Would you mind filing a new bug on this site, and we'll try to figure out how to get me to reproduce what you're seeing...

One thing worth checking is whether the hang still happens in safe mode.

Comment 8

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

Clear a needinfo that is pending on an inactive user.

Inactive users most likely will not respond; if the missing information is essential and cannot be collected another way, the bug maybe should be closed as INCOMPLETE.

For more information, please visit auto_nag documentation.