[Bug 403411] [NEW] firefox completely freezes up for 30 seconds on DNS server down

Gavin McCullagh gmccullagh at gmail.com
Thu Jul 23 09:00:00 UTC 2009


Public bug reported:

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

** Affects: firefox-3.0 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
firefox completely freezes up for 30 seconds on DNS server down
https://bugs.launchpad.net/bugs/403411
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