1.2.3-RC3 extreme number of inetd processes



  • I'm running the nanobsd 1.2.3 RC3, and I noticed a huge number of processes (several hundred) on the RRD graphs.

    http://imgur.com/eZrEh.png

    http://imgur.com/fwOQZ.png

    The first drop-off is due to a reboot. The second drop-off is apparently due to an overflow at 1024(?) and an error in the graph rendering. In fact there are more than 1100 processes.

    ps aux reports an extreme number of entries like such:

    root    1683  0.0  0.1  3268  1500  ??  I    2:02AM  0:00.00 inetd: wrapping (inetd)

    I believe these are wrapping nc, but honestly I don't know that much about how these things work.

    These are being spawned in groups, and each time only a few (one?) from the previous group dies.
    For example, 5 processes launched at 2:02.
    Another 13 launched at 2:17, and 4 of the 2:02 remain.
    41 launched at 2:28, 12 of the 2:17 remain, and still 4 of the 2:02 remain.

    This seems to be caused by the Deluge bittorrent client. I started using this client after the RC3 upgrade, so I don't know if earlier versions are affected. Azureus doesn't seem to cause this problem.

    I have port forwards set up for bittorrent, and I have NAT reflection enabled.



  • Further information:

    Disabling DHT in Deluge alleviates the problem. So the blame falls on DHT in libtorrent-rasterbar2, version 0.14.2-2ubuntu1


  • Rebel Alliance Developer Netgate

    NAT reflection is what gets launched from inetd.



  • I just realized that I didn't make this clear in the original post: these processes never die. Closing the offending application only stops the creation of new processes. I have to reboot pfSense to restore sanity. I assume I could kill them from the console, but I haven't tried that as I don't know how to do it without killing useful well-behaved instances and potentially breaking something.



  • I'm seeing the same thing, but without any bittorrent traffic. In my case, I think it might be UDP DNS reflection that triggers it. I'm running off CF card w/o any swap, and am getting a lot of process kills due to lack of swap (even with 512M RAM and low load), so I'm going to try rebuilding with swap space to see if this problem still exists.

    example line in /var/etc/inetd.conf

    19111 dgram udp nowait/0 nobody /usr/bin/nc nc -u -w 2000 192.168.1.16 53

    example inetd process

    root  15877  0.0  0.0  3268    8  ??  IN    9:59AM  0:00.00 inetd: wrapping (inetd)

    example nc process (also hanging)

    nobody 13983  0.0  0.0  3184    8  ??  Ss    9:56AM  0:00.00 nc -u -w 2000 192.168.1.16 53

    lots of these in dmesg

    pid 15741 (inetd), uid 0, was killed: out of swap space
    pid 16286 (sh), uid 0, was killed: out of swap space
    pid 16287 (sh), uid 0, was killed: out of swap space
    […]


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