391682 - Firefox uses synchronious blocking DNS requests that stall whole application for tens of seconds when roken DNS names do not resolve due to timeout

Status: RESOLVED DUPLICATE of bug 235853

(Firefox :: General, defect)

Description

[Oles Hnatkevych]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6

At least when using proxy auto configuration, browsing a page that references some URL's that do not resolve in DNS and DNS server does not respond immediately, makes the whole firefox application hang for a while, causing a Windows OS tell that 'application does not respond', inability to do anything with any open page or tab, possibly time-out other downloads in manager. The only thing a user can do is 1) relax and wait a minute and close that page and never return there 2) close firefox and reopen, so the session resumes without the last tab open, the one with broken page. I do not know what exact part of application/OS causes this behavior, but it has to be mended. If it is OS problem, there has to be a workaround.

The same problem our world experienced long ago with Internet Explorer family browsers, I had a hope that in 21-th century programmers that build the new-generation browser are smart enough not to repeat this awful errors, but hope turned out to be vain.

Reproducible: Always

Steps to Reproduce:
Go to example page.


Expected Results:  
At least allow a user to close bad page, or not to display element that can not be loaded, but not stop the whole world cause some DNS server went down to black hole.

Comment 1

[Mardeg]

Dupe of bug 235853 - see http://kb.mozillazine.org/Firefox_hangs#Hang_loading_websites_when_using_an_automatic_proxy_configuration_file

Comment 2

[Samuel Sidler (old account; do not CC)]

I concur.