netdev - Re: [Regression] 6.0.16-6.0.18 kernel no longer return EADDRINUSE from bind

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Message-ID: <CAFsF8vJ3wS-Yoy9tNZD2ZESevGenvYKqieD4F8+UztRsrJ=png@mail.gmail.com>
Date:   Thu, 12 Jan 2023 14:27:06 +0100
From:   Paul Holzinger <pholzing@...hat.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, regressions@...ts.linux.dev,
        netdev@...r.kernel.org
Subject: Re: [Regression] 6.0.16-6.0.18 kernel no longer return EADDRINUSE
 from bind

Hi Greg,

Nothing particular is keeping me on this kernel, it is currently
shipped in fedora.
I assume fedora will update to 6.1 as usual so updating is not a problem for me.

I wasn't sure how long the 6.0 series gets updates so I decided to
report it here. If it is EOL that is fine for me.

Thanks,
Paul


On Thu, Jan 12, 2023 at 12:50 PM Greg KH <gregkh@...uxfoundation.org> wrote:
>
> On Wed, Jan 11, 2023 at 04:52:21PM +0100, Paul Holzinger wrote:
> > Hi all,
> >
> > Since updating to 6.0.16 the bind() system call no longer fails with
> > EADDRINUSE when the address is already in use.
> > Instead bind() returns 1 in such a case, which is not a valid return
> > value for this system call.
> >
> > It works with the 6.0.15 kernel and earlier, 6.1.4 and 6.2-rc3 also
> > seem to work.
> >
> > Fedora bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2159066
> >
> > To reproduce you can just run `ncat -l 5000` two times, the second one
> > should fail. However it just uses a random port instead.
> >
> > As far as I can tell this problem is caused by
> > https://lore.kernel.org/stable/20221228144337.512799851@linuxfoundation.org/
> > which did not backport commit 7a7160edf1bf properly.
> > The line `int ret = -EADDRINUSE, port = snum, l3mdev;` is missing in
> > net/ipv4/inet_connection_sock.c.
> > This is the working 6.1 patch:
> > https://lore.kernel.org/all/20221228144339.969733443@linuxfoundation.org/
>
> As 6.0.y is now end-of-life, is there anything keeping you on that
> kernel tree?  If you send a fix-up patch for this, I'll gladly apply it
> and push out one more 6.0 release with it.
>
> thanks,
> g
> reg k-h
>