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Date: Mon, 7 Jun 2010 10:59:02 +0100
Message-ID: <AANLkTinkw2R2rCO4v5Ycnn7Tvr54noY99e01Fr2Cjmh2@mail.gmail.com>
Subject: Re: [classlib] linux (and freebsd) socket test failures
From: Andrew John Hughes <gnu_andrew@member.fsf.org>
To: dev@harmony.apache.org
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On 7 June 2010 10:48, Mark Hindess <mark.hindess@googlemail.com> wrote:
>
> I recently started seeing quite a lot of socket test failures on my
> main Debian Linux machine. =C2=A0It turns out that an upgrade of the netb=
ase
> package included a new file:
>
> =C2=A0/etc/sysctl.d/bindv6only.conf
>
> which sets the system configuration:
>
> =C2=A0net.ipv6.bindv6only =3D 1
>
> which means that IPv6 bound sockets only accept IPv6 connections and not
> IPv4 connections (w/address mapping). =C2=A0The expectation is that daemo=
ns
> wanting to accept both IPv6 and IPv4 connections bind twice.
>
> Then I had a Eureka! moment and remembered that I had some FreeBSD
> changes that I had not committed yet because I was still getting socket
> test failures when I had fixed everything that I thought was broken....
> and the pattern of failures was similar. =C2=A0Changing the equivalent
> "net.inet6.ip6.v6only=3D0" seems to have fixed most of the remaining
> issues. =C2=A0I'll tidy up these changes[0] and commit them shortly.
>
> For the time being I've changed this back on my machine (by editing the
> above file and replacing the 1 with 0). =C2=A0However, I wonder if we sho=
uld
> be handling this in the classlib implementation. =C2=A0If we don't then u=
sers
> will experience a change in behaviour unless they change the system
> default but changing the system default may have unintended consequences
> for other applications.
>
> I believe it is possible to set the IPV6_V6ONLY socket option to avoid
> the change in behaviour but for the moment, it looks like the RI is not
> doing this so I guess we shouldn't either?
>

FYI, this problem has also been found with OpenJDK and patched
(at least, in the Debian package so far).

http://mail.openjdk.java.net/pipermail/distro-pkg-dev/2010-April/008866.htm=
l

> Regards,
> =C2=A0Mark.
>
> [0] Mostly removing the many things that I tried that we not actually
> =C2=A0 =C2=A0necessary ;-)
>
>
>


--=20
Andrew :-)

Free Java Software Engineer
Red Hat, Inc. (http://www.redhat.com)

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