Bug 38363

Summary:	firebird 0.7 produces strange 127.0.0.1 DNS queries
Product:	Gentoo Linux	Reporter:	Felix von Leitner <felix-gentoo>
Component:	Current packages	Assignee:	Mozilla Gentoo Team <mozilla>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Felix von Leitner 2004-01-15 18:45:55 UTC

MozillaFirebird 0.7 sometimes does not ask my DNS server at fec0:0:0:ffff::1 (that's an IPv6 anycast address and it is served by a dnscache on the same box) but sends it's DNS query to 127.0.0.1.  There is no DNS server at 127.0.0.1, so the DNS query fails, and Firebird will tell me that the site does not exist.  Reloading fixes the problem.  I can't reproduce this reliably, and it is quite rare with 0.7.  It happened a lot more often with 0.8+ (the current CVS HEAD), that's why I even noticed and did a tcpdump to investigate.

I reported this to the Mozilla people, and they said Mozilla simply uses getaddrinfo from glibc.  I ran a test program many times calling getaddrinfo and could not reproduce the problem.  I am not sure whether Mozilla overwrites some memory here or whatnot.  Has someone else experienced this problem as well?

Reproducible: Sometimes
Steps to Reproduce:
1.run MozillaFirebird 0.7
2.go to some site with lots of inline images, for example a fark.com photoshop contest
3.witness a lot of broken images that suddenly work if you reenter the same page

Actual Results:  
many "broken images".  Running tcpdump shows a lot of DNS requests going to the 
correct DNS server, and a few going to 127.0.0.1, which is not mentioned in 
my /etc/resolv.conf, and these cause the broken images. 

Expected Results:  
Not ask 127.0.0.1 

Portage 2.0.50_pre16 (default-x86-1.4, gcc-3.3.2, glibc-2.3.3_pre20031222-r0, 
2.6.0) 
================================================================= 
System uname: 2.6.0 i686 AMD Athlon(tm) XP 2000+ 
Gentoo Base System version 1.4.3.12 
Autoconf: sys-devel/autoconf-2.59 
Automake: sys-devel/automake-1.7.8 
ACCEPT_KEYWORDS="x86 ~x86" 
AUTOCLEAN="yes" 
CFLAGS="-pipe -Os" 
CHOST="i686-pc-linux-gnu" 
COMPILER="gcc3" 
CONFIG_PROTECT="/etc /usr/X11R6/lib/X11/xkb /usr/kde/2/share/config /usr/kde/3.1/share/config /usr/kde/3/share/config /usr/share/config /var/qmail/control" 
CONFIG_PROTECT_MASK="/etc/gconf /etc/env.d" 
CXXFLAGS="-mcpu=athlon-xp -Os -pipe -fomit-frame-pointer" 
DISTDIR="/cvs/distfiles" 
FEATURES="autoaddcvs ccache sandbox" 
GENTOO_MIRRORS="http://160.45.44.196:81 http://gentoo.oregonstate.edu/ 
http://distro.ibiblio.org/pub/linux/distributions/gentoo" 
MAKEOPTS="-j2" 
PKGDIR="/usr/portage/packages" 
PORTAGE_TMPDIR="/var/tmp" 
PORTDIR="/usr/portage" 
PORTDIR_OVERLAY="" 
SYNC="rsync://160.45.117.66/gentoo-portage" 
USE="X apm arts avi berkdb cdr crypt encode esd fbcon foomaticdb gdbm gif gnome 
gpm gtk2 imlib ipv6 java jpeg kde ldap libg++ libwww mad mikmod motif mpeg 
ncurses nls nptl oggvorbis opengl oss pam pdflib perl png python qt quicktime 
readline sdl slang spell ssl tcpd truetype x86 xml2 xv zlib"

Comment 1 Tiago Freire 2005-03-16 04:35:05 UTC

Mozilla firebird (earliest firefox is 0.9.3) is not even in the portage tree anymore, shouldn't this bug be closed/nuked/whatever (resolved, wontfix)?

Comment 2 Felix von Leitner 2005-03-16 04:59:34 UTC

this bug turned out to be a bug in glibc and was fixed in recent glibc versions.