[Pdns-users] tcp listener issue - hopefully fixed

bert hubert bert.hubert at netherlabs.nl
Sun Aug 29 18:15:40 UTC 2010

On Sun, Aug 29, 2010 at 04:56:14PM +0200, bert hubert wrote:
> We've fixed yet another bug that might be causing the issue, and we are
> currently testing that.
> This drop can be found on
> http://svn.powerdns.com/snapshots/pdns-recursor-3.3-pre.tar.bz2

Our testing shows that the problem disappeared! Many thanks to Christian

If this was the final problem, this also explains why only some people are
seeing it. There are hardware platforms that are highly immune to this bug
(Michel Stol measured this), but we've seen an Openvirtuozo hosted Linux
being very vulnerable to it.

On my own testing hardware, the problem was relatively rare.

For the people who care, the root cause appeared to be doing non-atomic
updates to the TCP client count. 

The release process for 3.3 can now start - only 1 feature request left to


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