[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


looking at this page on the wiki yesterday, 

the logo image which has address 

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

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.


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

firefox completely freezes up for 30 seconds on DNS server down
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