[Pdns-users] PDNS-Recursor Segfaults

James Baer james at idriveinteractive.com
Wed May 21 12:39:35 UTC 2014

Thank you all for looking into this and for the suggestions. I'll give 
them a try and report back.


On 05/21/2014 01:09 AM, bert hubert wrote:
> On Tue, May 20, 2014 at 03:58:19PM -0400, James Baer wrote:
>> Any body have an ideas what I can do to correct this problem? I
>> really don't see a reason why the recursor would care how many ip
>> addresses I have on a system.
> Hi James,
>  From the investigations performed by Imre and Aki overnight, this appears to
> be a Linux bug in the C library. When we first lookup an IPv6 address, the
> kernel is consulted to for which network families are available by
> enumerating all IP addresses.
> Older versions of libc perform this function on the stack; with sufficient
> IP addresses, this overflows the stack.
> http://www.sourceware.org/ml/libc-alpha/2013-10/msg00141.html has some
> details, and note that the fix comes from Akamai, who presumably run into
> the same problem.
> A workaround may be to run "ulimit -s 1000000" before starting PowerDNS.
> Another workaround would be to upgrade to a newer version of CentOS, which
> might contain the actual fix - but this might not yet have happened.
> Good luck! And thanks to Aki and Imre for helping figure out what is going
> on.
> 	Bert
> 	PowerDNS

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