apt-cacher-ng leaks file descriptors: Too many open files

[Marti]

Binary package hint: apt-cacher-ng

Every time I do an "apt-get update" behind the apt-cacher-ng proxy (package version 0.4-1), the proxy seems to leak 6 file descriptors. At this rate it runs out of file descriptors pretty quickly and eventually fails to service connections. It doesn't, however, consume 100% CPU on my computer as described in the Debian bug.

At first apt-get starts printing HTTP errors like:
* 503 Cache storage error
* 503 Cache storage error while opening data file
* 500 Connection failure: Too many open files
and eventually just freezes up with "[Waiting for headers]"

apt-cacher was running fine for a week with ~10 servers, but now it keeps crashing repeatedly. After restarting it works fine until it hits the limit again. The cache server is running Ubuntu 9.10 Karmic inside a KVM virtual machine.

I tried with "apt-get update" from localhost (Karmic) and another Lucid machine, over both IPv4 and IPv6.

In /proc/PID/fd descriptors 5-1023 are all sockets. Netstat shows some connections to 127.0.0.1:3142 and to Ubuntu archives in various closing states.

I obtained the strace using:
sudo -u apt-cacher-ng strace -f apt-cacher-ng 2>apt-cacher-ng.strace
while true; do apt-get update; done

[Eduard Bloch (edi-gmx)]

The crash problem sounds like bug #532353, no idea how to solve that. The file handle leak might be solved in Debian version 0.4.7. You seem to be running amd64, try the test build from https://www.unix-ag.uni-kl.de/~bloch/acng/ubuntu/ please.

[Marti (intgr)]

Indeed, that package fixes the file descriptor leak.

By "crashing" I meant running out of file descriptors in the manner described above -- not SEGV or anything like that.

[Eduard Bloch (edi-gmx)]

Hey MOTU, if you need a patch to solve just this issue, see attachment.

[Rolf Leggewie (r0lf)]

lucid has seen the end of its life and is no longer receiving any updates. Marking the lucid task for this ticket as "Won't Fix".