Public bug reported:
After upgrading to Ubuntu 9.04, I've looking all over for a bug causing
my network to sporadically hang. I've finally tracked it down the the
2.9 version included in jaunty. After upgrading to libc6 2.10.1,
performance has significantly improved to be as good as, or better than
it was in previous Ubuntu releases.
The problem appears while browsing in firefox. All connections will
hang for 15 to maybe 60 seconds, and frequently the status bar reports
"Looking up xyz...". While that is happening, I can see a ping command
I'm a terminal window hang and begin to lose packets, a "host xyz"
command will hang and possibly timeout, and any other network
connections hang. As soon as firefox either times out or resolves the
address, everything returns to life, remote connections show any output,
and the ping resumes. Not having the time to look through the name
resolution code, my guess is that the DNS requests are locking the
entire network stack. And with the fixes to DNS lookups in the latest
libc6, the problem was either resolved or isn't noticeable anymore.
Attempts to resolve this issue included turning off security settings in
firefox (edit -> preferences -> security -> uncheck the "tell me if the
site I'm visiting..." boxes), upgrading to linux kernel 2.6.31 and
adding "ipv6.disable=1" to the /boot/grub/menu.lst entry for this
kernel, updating nsswitch.conf with the line "hosts: files dns", and
stopping the avahi-daemon.
I'd recommend the latest libc6 be considered for the current stable
version of Ubuntu, or at least leaving the bug report open for those
trying to resolve the same issue.
# lsb_release -rd
Description: Ubuntu 9.04
Release: 9.04
# apt-cache policy libc6
libc6:
Installed: 2.10.1-0ubuntu8
Candidate: 2.10.1-0ubuntu8
Version table:
*** 2.10.1-0ubuntu8 0
100 /var/lib/dpkg/status
2.9-4ubuntu6 0
500 http://us.archive.ubuntu.com jaunty/main Packages
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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DNS lookups hang network in 2.9-4ubuntu6
https://bugs.launchpad.net/bugs/422016
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