pdnsd leaking udp sockets
Ashish SHUKLA
ashish at freebsd.org
Tue Feb 15 11:57:04 UTC 2011
Marius Nünnerich writes:
> Hi Ashish,
[...]
> dmesg and messages are clean. My FreeBSD ist 8.0-RELEASE/amd64.
> I took a look at the code too but couldn't see anything suspicious. I
> don't have time right now but one idea would be to add some dtrace
> probes to the source.
I looked at the source code, and found a place where it's leaking socket
descriptors, but I'm not sure if this is the major source of impact. I fixed
that. You can test the diff[1] to see if it fixes issue you're experiencing.
To reproduce this at my end, I switched to 'resolv.conf' server method and
commented 'server_ip' in the pdnsd.conf(5). Following are the contents of the
resolv.conf(5):
#v+
chateau.d.if!abbe:~ % cat /etc/resolv.conf
nameserver 127.0.0.1
nameserver 4.2.2.2
#v-
Before applying the diff, it is leaking following socket descriptor:
#v+
chateau.d.if!abbe:~ % sockstat -64 |fgrep pdns
nobody pdnsd 38434 3 tcp4 *:53 *:*
nobody pdnsd 38434 4 udp4 *:* *:*
nobody pdnsd 38434 5 udp4 *:53 *:*
#v-
And with the diff applied:
#v+
chateau.d.if!abbe:~ % sockstat -64 |fgrep pdns
nobody pdnsd 43666 3 tcp4 *:53 *:*
nobody pdnsd 43666 4 udp4 *:53 *:*
#v-
References:
[1] http://people.freebsd.org/~ashish/diffs/pdnsd-sockets-leak.diff
HTH
--
Ashish SHUKLA | GPG: F682 CDCC 39DC 0FEA E116 20B6 C746 CFA9 E74F A4B0
freebsd.org!ashish | http://people.freebsd.org/~ashish/
Avoid Success At All Costs !!
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