210585 - hang if loopback interface is down

Status: RESOLVED INCOMPLETE

(Core :: Networking, defect)

Description

[bob642thing]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4b) Gecko/20030516 Mozilla Firebird/0.6
Build Identifier: http://komodo.mozilla.org/pub/firebird/nightly/2003-06-21-08-trunk/

If the loopback interface is not working, Firebird hangs when you attempt to
type in a URL.
This occurs both with 0.6 and the 06-21 nightly, on Redhat 9.
While it successfully loads the homepage, if I click on a link, or type in a
URL, it hangs. 
All other internet programs still work, while loopback is gone (mail, ICQ,
konqueror, etc).

Reproducible: Always

Steps to Reproduce:
1.Add the following iptables rules:
iptables -F
iptables -P INPUT DROP
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT 
2. Loopback is now 'blocked'. Firebird now hangs.
3. If you add: iptables -A INPUT -i lo -j ACCEPT, it will work again.

Actual Results:  
Process hangs, forcing me to kill it.

Expected Results:  
Worked. :)

Comment 1

[Philip White]

I shut down my loopback interface on Linux 2.4.21 using the ifconfig command
("ifconfig lo down"), then browsed the web in Mozilla/5.0 (X11; U; Linux i686;
en-US; rv:1.5a) Gecko/20030731 Mozilla Firebird/0.6.1 without a problem.

I will try your procedure for disabling loopback shortly.

Comment 2

[Simon Paquet [:sipaq]]

Reporter, does this bug still apply?

Comment 3

[bob642thing]

Yes. I've tried this again with the following build:

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.5) Gecko/20031007 Firebird/0.7
(the standard 0.7 Linux/GTK2/XFT build)

and the problem still occurs. Without the loopback traffic, Firebird just
completely freezes, and does not respond at all. As soon as the loopback traffic
is allowed, it starts working again.

Comment 4

[alanjstr]

Please test this with Mozilla.

Comment 5

[Ashley Smith]

I also have this problem, even with the lastest build (20/12/2003).  A *very*
old Mozilla (1.2.1) I tested works fine if loopback is down.

Comment 6

[Simon Paquet [:sipaq]]

Confirming.

Comment 7

[:Gavin Sharp [email: [e-mail]]]

Is this still an issue using a recent build?

Comment 8

[Ryan Flint [:rflint] (ping via IRC for reviews)]

*** Bug 334121 has been marked as a duplicate of this bug. ***

Comment 9

[Jan Spurny]

(In reply to comment #7)
> Is this still an issue using a recent build?
> 

It happens for me on linux 2.6.16 debian etch, mozilla version:

Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.4) Gecko/20060406 Firefox/1.5.0.4 (Debian-1.5.dfsg+1.5.0.4-1)

when i've activated lo interface, it works.

Comment 11

[Matthias Versen [:Matti]]

Is this still an issue ?

Comment 12

[:Gavin Sharp [email: [e-mail]]]

No feedback since Firefox 1.5 - re-open if this is still an issue in recent builds.