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From: Paul Holzinger <pholzing@redhat.com>
To: stable@vger.kernel.org
Cc: regressions@lists.linux.dev, netdev@vger.kernel.org
Subject: [Regression] 6.0.16-6.0.18 kernel no longer return EADDRINUSE from bind
Date: Wed, 11 Jan 2023 16:52:21 +0100	[thread overview]
Message-ID: <CAFsF8vL4CGFzWMb38_XviiEgxoKX0GYup=JiUFXUOmagdk9CRg@mail.gmail.com> (raw)

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/

Best regards,
Paul


             reply	other threads:[~2023-01-11 15:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-11 15:52 Paul Holzinger [this message]
2023-01-12 11:40 ` [Regression] 6.0.16-6.0.18 kernel no longer return EADDRINUSE from bind Greg KH
2023-01-12 13:27   ` Paul Holzinger

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