[Pdns-users] Pipe Backend not working correctly

[Roman Gaufman]

Hi :)

This is the pipe-command related stuff in my pdns.conf (rest is default):

launch=pipe,bind
pipe-command=/etc/powerdns/dns_pipe.rb
pipebackend-abi-version=2
pipe-timeout=5
distributor-threads=1

When I use the vanilla Ubuntu package that comes in Precise, it works for a
few days, then it stops responding to requests. I have enabling logging but
all I see is:

Jan 27 21:25:26 zanview pdns[30070]: Query: 'Q#
011zanview.com#011IN#011SOA#011-1#01162.189.34.89#0110.0.0.0'
Jan 27 21:25:26 zanview pdns[30070]: Query: 'Q#
011zanview.com#011IN#011ANY#011-1#01162.189.34.89#0110.0.0.0'

I have no idea what is happening, pdns is not growing in memory and taking
a low 0.1% cpu but the pipe backend simply stops responding after a few
days!

I saw that pdns had some commits related to the pipe backend so I've
upgrade to the official package: pdns-static 3.2-1

Now when I run pdns_server I see this in the log:

Jan 27 22:13:19 zanview pdns[13883]: Engaging bypass - now operating
unthreaded
Jan 27 22:13:19 zanview pdns[13883]: [PIPEBackend] Fatal argument error:
Timeout waiting for data from coprocess
Jan 27 22:13:19 zanview pdns[13883]: Caught an exception instantiating a
backend: Timeout waiting for data from coprocess
Jan 27 22:13:19 zanview pdns[13883]: Cleaning up
Jan 27 22:13:19 zanview pdns[13883]: Got a signal 6, attempting to print
trace:
Jan 27 22:13:19 zanview pdns[13883]: /usr/sbin/pdns_server-instance()
[0x6b6ce0]
Jan 27 22:13:19 zanview pdns[13883]:
/lib/x86_64-linux-gnu/libc.so.6(+0x364a0) [0x7f56908774a0]
Jan 27 22:13:19 zanview pdns[13883]:
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x35) [0x7f5690877425]
Jan 27 22:13:19 zanview pdns[13883]:
/lib/x86_64-linux-gnu/libc.so.6(abort+0x17b) [0x7f569087ab8b]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(_ZN9__gnu_cxx27__verbose_terminate_handlerEv+0x115)
[0xb62315]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(_ZN10__cxxabiv111__terminateEPFvvE+0x6)
[0xb60756]
Jan 27 22:13:19 zanview pdns[13883]: /usr/sbin/pdns_server-instance()
[0xb60783]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(__cxa_rethrow+0x46) [0xb60806]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(_ZN17BackendMakerClass3allEb+0x6e9)
[0x69b179]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(_ZN12UeberBackendC1ERKSs+0x169) [0x6c0709]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(_ZN13PacketHandlerC1Ev+0x20) [0x673080]
Jan 27 22:13:19 zanview pdns[13883]: /usr/sbin/pdns_server-instance()
[0x6f28a1]
Jan 27 22:13:19 zanview pdns[13883]:
/usr/sbin/pdns_server-instance(_Z7qthreadPv+0xb38) [0x6f4948]
Jan 27 22:13:19 zanview pdns[13883]:
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7e9a) [0x7f5690f03e9a]
Jan 27 22:13:19 zanview pdns[13883]:
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f5690934cbd]
Jan 27 22:13:20 zanview pdns[13670]: Our pdns instance (13883) exited after
signal 6
Jan 27 22:13:20 zanview pdns[13670]: Respawning

Here is the pipe script in action:

~ # sudo -u pdns /etc/powerdns/dns_pipe.rb
Q test_host IN      ANY -1 192.0.43.10
DATA test_host IN A 120 -1 89.207.135.250
END

So it doesn't appear to be the script or anything to do with permissions.

Any ideas what am I doing wrong?
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