[nsd-users] memory leak in 4.0.x

Will Pressly will at edgecast.com
Tue Aug 5 08:57:04 UTC 2014


yeah. I capture stats every minute as well -- which profoundly aggravates
the problem. Anything that forks -- nsd-control [reconfig|reload|stats],
etc will trip on this.

have you confirmed that you have an affected kernel? I can send you the
test program we used to spot the issue, if you like...


On Tue, Aug 5, 2014 at 1:45 AM, Anand Buddhdev <anandb at ripe.net> wrote:

> On 05/08/2014 10:24, Will Pressly wrote:
> > addendum:
> > 1. this problem apparently started with 2.6.34.
> > 2. In my last line that should have read: " but we definitely have to
> > periodically *restart* NSD until this issue is addressed."
> Very interesting. We have the exact same issue, and our symptoms are
> also the same. We periodically have to restart NSD to alleviate server
> load. Wouter Wijngaards and I have been trying to find the problem for
> ages, and we both thought it was in NSD. I've been trying various
> patches he made, but nothing has helped, and now it seems clear why,
> because the bug isn't in NSD. Of course, NSD's frequent forking probably
> makes this worse, and on our server with several thousand zones, the
> zone refresh rate is quite high.
> Anand
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