Bug#639837: UI hangs for 30s while loading pages

Mike Hommey mh at glandium.org
Tue Aug 30 20:32:31 UTC 2011


On Tue, Aug 30, 2011 at 09:17:11PM +0200, Ulrich Eckhardt wrote:
> Package: iceweasel
> Version: 5.0-6
> Severity: important
> 
> Iceweasel regularly hangs while loading pages. Many pages show the
> symptoms, though never regularly. I haven't determined if some do and 
> some don't. It could also be that some advertisments that are being 
> randomly served influence the issue.
> 
> Following symptoms:
> 1. Complete UI freeze
> No switching to other tabs, aborting loading of the website, not even 
> redrawing the window.
> 
> 2. There is always some pending IO
> The lower-left status popup (where e.g. the URL you're hovering over is 
> displayed) shows the state of the loading operation. While the UI hangs, 
> this is typically in the state "Waiting for www.example.com...".
> 
> 3. In the output (~/.xsession-errors), I get these four lines:
> >
> > ** (firefox-bin:29217): WARNING **: Serious fd usage error 14
> >
> > ** (firefox-bin:29217): WARNING **: Serious fd usage error 10
> Yes, two empty ones and two with these warnings! These always (or usually) 
> come in such pairs. I have seen errors 10, 13, 14 (according to errno 
> those are ECHILD, EACCES, EFAULT) there.
> 
> 4. Neither high CPU (htop) nor IO (iostat) load occurs.
> 
> 5. After 30s, loading and UI operation resumes, without any faults. The 
> interesting thing here is that these 30s are reproducible, not randomly. 
> I watched the clock after a few such hangs to find that this is systematic 
> indeed.

How big is the ~/.mozilla/firefox/*/sessionstore.js file ?

Mike





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