Maintained by: NLnet Labs

[Unbound-users] Problems with 100% CPU load of unbound

W.C.A. Wijngaards
Thu Jul 22 15:13:50 CEST 2010


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Hi Sebastian,

In 1.4.5 a bug was fixed where a long loop could be entered, now cycle
detection has a loop-counter and maximum search amount.

An upgrade to 1.4.5 (or 1.4.6rc1) may solve the issue.  If not please
let me know.

Best regards,
   Wouter


On 07/22/2010 02:50 PM, Sebastian Nickel - Hetzner Online AG wrote:
> Hello,
> we use unbound in a loadbalancer configuration. We noticed that
> sometimes the unbound process uses 100% of CPU even when it does not
> receive any DNS requests. It uses this 100% cpu load till we restart the
> process. After restarting all is ok again.
> 
> We don't know why this happens. We used unbound from debian-testing and
> a self compiled version, too. The issue happened in both installations. 
> 
> Does anybody have any information about this issue?
> 
> Currently used versions:
> 
> unbound:
> --------
> self compiled, configure options: "--without-pthreads
> --without-solaris-threads"
> Version 1.4.4
> linked libs: event 3.9, ldns 1.4.0, OpenSSL 0.9.8o 01 Jun 2010
> linked modules: validator iterator
> 
> OS:
> ---
> Debian Lenny
> Kernel: 2.6.26-2-amd64
> 
> 
> unbound.conf
> ------------
> server:
> 	verbosity: 0
> 	num-threads: 2
> 	interface: 0.0.0.0
> 	interface-automatic: yes
> 	outgoing-range: 450
> 	msg-cache-size: 333m
>         msg-cache-slabs: 4
> 	rrset-cache-size: 666m
> 	rrset-cache-slabs: 4
> 	infra-cache-slabs: 4
> 	access-control: 0.0.0.0/0 allow
> 	chroot: ""
> 	key-cache-slabs: 4
> 
> 
> Thanks...
> 
> _______________________________________________
> Unbound-users mailing list
> Unbound-users at unbound.net
> http://unbound.nlnetlabs.nl/mailman/listinfo/unbound-users

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