linux-kernel - Re: [regression 6.1.67] dlm: cannot start dlm midcomms -97 after backport of e9cdebbe23f1 ("dlm: use kernel_connect() and kernel

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Message-ID: <CAK-6q+hza9yXb5KpBS2VJMNHJa805nXqiYPTovnf9G-JFadBsg@mail.gmail.com>
Date: Wed, 7 Feb 2024 16:27:48 -0500
From: Alexander Aring <aahringo@...hat.com>
To: Jordan Rife <jrife@...gle.com>
Cc: Salvatore Bonaccorso <carnil@...ian.org>, Valentin Kleibel <valentin@...is.at>, 
	David Teigland <teigland@...hat.com>, 1063338@...s.debian.org, gfs2@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
	gregkh@...uxfoundation.org, regressions@...ts.linux.dev
Subject: Re: [regression 6.1.67] dlm: cannot start dlm midcomms -97 after
 backport of e9cdebbe23f1 ("dlm: use kernel_connect() and kernel_bind()")

Hi,

On Wed, Feb 7, 2024 at 1:33 PM Jordan Rife <jrife@...gle.com> wrote:
>
> On Wed, Feb 7, 2024 at 2:39 AM Salvatore Bonaccorso <carnil@...ian.org> wrote:
> >
> > Hi Valentin, hi all
> >
> > [This is about a regression reported in Debian for 6.1.67]
> >
> > On Tue, Feb 06, 2024 at 01:00:11PM +0100, Valentin Kleibel wrote:
> > > Package: linux-image-amd64
> > > Version: 6.1.76+1
> > > Source: linux
> > > Source-Version: 6.1.76+1
> > > Severity: important
> > > Control: notfound -1 6.6.15-2
> > >
> > > Dear Maintainers,
> > >
> > > We discovered a bug affecting dlm that prevents any tcp communications by
> > > dlm when booted with debian kernel 6.1.76-1.
> > >
> > > Dlm startup works (corosync-cpgtool shows the dlm:controld group with all
> > > expected nodes) but as soon as we try to add a lockspace dmesg shows:
> > > ```
> > > dlm: Using TCP for communications
> > > dlm: cannot start dlm midcomms -97
> > > ```
> > >
> > > It seems that commit "dlm: use kernel_connect() and kernel_bind()"
> > > (e9cdebbe) was merged to 6.1.
> > >
> > > Checking the code it seems that the changed function dlm_tcp_listen_bind()
> > > fails with exit code 97 (EAFNOSUPPORT)
> > > It is called from
> > >
> > > dlm/lockspace.c: threads_start() -> dlm_midcomms_start()
> > > dlm/midcomms.c: dlm_midcomms_start() -> dlm_lowcomms_start()
> > > dlm/lowcomms.c: dlm_lowcomms_start() -> dlm_listen_for_all() ->
> > > dlm_proto_ops->listen_bind() = dlm_tcp_listen_bind()
> > >
> > > The error code is returned all the way to threads_start() where the error
> > > message is emmitted.
> > >
> > > Booting with the unsigned kernel from testing (6.6.15-2), which also
> > > contains this commit, works without issues.
> > >
> > > I'm not sure what additional changes are required to get this working or if
> > > rolling back this change is an option.
> > >
> > > We'd be happy to test patches that might fix this issue.
> >
> > Thanks for your report. So we have a 6.1.76 specific regression for
> > the backport of e9cdebbe23f1 ("dlm: use kernel_connect() and
> > kernel_bind()") .
> >
> > Let's loop in the upstream regression list for tracking and people
> > involved for the subsystem to see if the issue can be identified. As
> > it is working for 6.6.15 which includes the commit backport as well it
> > might be very well that a prerequisite is missing.
> >
> > # annotate regression with 6.1.y specific commit
> > #regzbot ^introduced e11dea8f503341507018b60906c4a9e7332f3663
> > #regzbot link: https://bugs.debian.org/1063338
> >
> > Any ideas?
> >
> > Regards,
> > Salvatore
>
>
> Just a quick look comparing dlm_tcp_listen_bind between the latest 6.1
> and 6.6 stable branches,
> it looks like there is a mismatch here with the dlm_local_addr[0] parameter.
>
> 6.1
> ----
>
> static int dlm_tcp_listen_bind(struct socket *sock)
> {
> int addr_len;
>
> /* Bind to our port */
> make_sockaddr(dlm_local_addr[0], dlm_config.ci_tcp_port, &addr_len);
> return kernel_bind(sock, (struct sockaddr *)&dlm_local_addr[0],
>    addr_len);
> }
>
> 6.6
> ----
> static int dlm_tcp_listen_bind(struct socket *sock)
> {
> int addr_len;
>
> /* Bind to our port */
> make_sockaddr(&dlm_local_addr[0], dlm_config.ci_tcp_port, &addr_len);
> return kernel_bind(sock, (struct sockaddr *)&dlm_local_addr[0],
>    addr_len);
> }
>
> 6.6 contains commit c51c9cd8 (fs: dlm: don't put dlm_local_addrs on heap) which
> changed
>
> static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT];
>
> to
>
> static struct sockaddr_storage dlm_local_addr[DLM_MAX_ADDR_COUNT];
>
> It looks like kernel_bind() in 6.1 needs to be modified to match.
>

makes sense. I tried to cherry-pick e9cdebbe23f1 ("dlm: use
kernel_connect() and kernel_bind()") on v6.1.67 as I don't see it
there. It failed and does not apply cleanly.

Are we talking here about a debian kernel specific backport? If so,
maybe somebody missed to modify those parts you mentioned.

- Alex