Illumos/SmartOS/Solaris issue when using eventport and keepalive at the same time

[Peter Toth]

Great, thanks for clarifying this.

On Sat, Mar 18, 2017 at 2:09 AM, Maxim Dounin <mdounin at mdounin.ru> wrote:

> Hello!
>
> On Fri, Mar 17, 2017 at 11:46:46AM +1300, Peter Toth wrote:
>
> > There is a lock-up issue on Solaris derived operating systems when using
> > "keepalive" and "use eventport" configuration directives at the same
> time.
> >
> > The issue has been described previously back in 2015 and a patch was
> > proposed here: https://forum.nginx.org/read.
> php?2,259798,259798#msg-259798
> >
> > I have tested the patch and it is working.
> >
> > Could anyone comment on whether the patch looks acceptable in its current
> > form?
> > Any objections to applying this fix in the next release?
>
> There are problems with eventport implementation, known for at
> least several years now, and these can be easily reproduced by
> running our test suite with 'use eventport' added to test
> configurations.  If I recall correctly, upstream keepalive is not
> something important to trigger problems, any connection to an
> upstream is basically enough.
>
> Unfortunately, these problems are very low priority due to
> minor popularity of Solaris.  Consider using /dev/poll instead,
> which is the default, well tested and has no known problems.
>
> The patch in question looks more like a hack to mitigate a
> particular issue the author was facing.  It doesn't resolve the
> underlying problems though, and likely there are other issues as
> well.  There are no plans to commit this patch.
>
> --
> Maxim Dounin
> http://nginx.org/
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>
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