linux-kernel - Re: [regression 6.1.76] dlm: cannot start dlm midcomms -97 after backport of e9cdebbe23f1 ("dlm: use kernel_connect() and kernel

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Date: Thu, 8 Feb 2024 13:17:11 -0800
From: Jordan Rife <jrife@...gle.com>
To: Valentin Kleibel <valentin@...is.at>
Cc: Salvatore Bonaccorso <carnil@...ian.org>, David Teigland <teigland@...hat.com>, 
	Alexander Aring <aahringo@...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 6.1.76] dlm: cannot start dlm midcomms -97 after
 backport of e9cdebbe23f1 ("dlm: use kernel_connect() and kernel_bind()")

Hi Valentin,

Would you be able to confirm that the attached patch fixes your issue as well?

-Jordan

On Thu, Feb 8, 2024 at 9:42 AM Jordan Rife <jrife@...gle.com> wrote:
>
> On Thu, Feb 8, 2024 at 3:37 AM Valentin Kleibel <valentin@...is.at> wrote:
> >
> > Hi Jordan, hi all
> >
> > > 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.
> >
> > We tried to apply commit c51c9cd8 (fs: dlm: don't put dlm_local_addrs on
> > heap) to the debian kernel 6.1.76 and came up with the attached patch.
> > Besides the different offsets there is a slight change dlm_tcp_bind()
> > where in 6.1.76 kernel_bind() is used instead of sock->ops->bind() in
> > the original commit.
> >
> > This patch solves the issue we experienced.
> >
> > Thanks for your help,
> > Valentin
>
> Good to hear that works for you! We should fix this in the 6.1 stable
> kernel as well.
>
> IMO it may be less risky and simpler to fix the backport of my patch
> e9cdebbe23f1 ("dlm: use kernel_connect() and
> kernel_bind()") and just switch (struct sockaddr *)&dlm_local_addr[0]
> to (struct sockaddr *)dlm_local_addr[0]
> in the call to kernel_bind() rather than backporting c51c9cd8 (fs:
> dlm: don't put dlm_local_addrs on
> heap) to 6.1.
>
> I will have some time soon to fix the 6.1 backport, but it may make
> sense just to revert in the meantime.
>
> -Jordan

View attachment "0001-dlm-Treat-dlm_local_addr-0-as-sockaddr_storage.patch" of type "text/x-patch" (1364 bytes)