Ubuntu
firefox-3.0 package

  1. Bug #403411
  2. Comment #11

Comment 11 for bug 403411

Revision history for this message
Gavin McCullagh (gmccullagh) wrote : firefox completely freezes up for 30 seconds on DNS server down

Binary package hint: firefox-3.0

Hi,

looking at this page on the wiki yesterday,
  https://help.ubuntu.com/community/UbuntuLTSP?action=recall&rev=139

the logo image which has address
  http://logicalnetworking.net/other/wiki/ltsp.jpg

was causing problems as it seems its DNS server was down. I watched the tcpdump and watched 40 seconds of request for an A record, 8-10 seconds, then a SERVFAIL, then that process 2-3 times more. All through this 30-40 seconds, firefox was completely frozen with the screen not even repainting.

This issue probably only happens where a DNS server is down (ie where you get to wait for a SERVFAIL as opposed to a NXDOMAIN which would happen quickly), but it's pretty awful when it happens.

I suspect the issue is probably an upstream one but I'm putting it here first in case there's a patch or setting in the ubuntu packaging which is causing it.

Gavin