[Bug 194919] New: kernel: pid 2509 (named), uid 53, was killed: out of swap space

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194919

            Bug ID: 194919
           Summary: kernel: pid 2509 (named), uid 53, was killed: out of
                    swap space
           Product: Base System
           Version: 10.0-STABLE
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: Normal
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: vistahome at qq.com

In one of our slave DNS servers BIND, version bind910-9.10.0P2_5, constantly
get killed with the following message in /var/log/messages:
Nov  9 05:11:14 zsusun2 kernel: pid 2509 (named), uid 53, was killed: out of
swap space

This service runs on a FreeBSD 10.0 VM in XCP 1.6, it has 922MB of system
memory.

At this moment swapinfo return this:
Device          1K-blocks     Used    Avail Capacity
/dev/ada0p3        944128     9060   935068     1%

I don't think it's a swap problem, it appears to be memory leakage, but I'm
unsure.

This is one of two slave DNS servers, they only store the zones from the
authoritative server and act as a recursive server for the internal users to
the outside world. The number of clients is something between 700-1500
simultaneous users. Since we have a /21 internal space and a /23 public IPv4
space and there's no queries from the outside world, the port 53 is even
blocked on the firewall to those machines.

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