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From:   Anna Schumaker <schumaker.anna@gmail.com>
Date:   Thu, 7 Apr 2022 10:00:30 -0400
Message-ID: <CAFX2Jf=ze2QcUeRMkWi8imFhmQY816z9dOhEpT8O-dA7Gx7y-Q@mail.gmail.com>
Subject: Re: Possible NFS4 regression on 5.18-rc1
To:     Muchun Song <songmuchun@bytedance.com>
Cc:     NeilBrown <neilb@suse.de>,
        Trond Myklebust <trondmy@hammerspace.com>,
        "sebastian.fricke@collabora.com" <sebastian.fricke@collabora.com>,
        "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>
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I started seeing the same problem when I rebased on rc1, and the
suggested patch fixes it for me.

Anna

On Wed, Apr 6, 2022 at 11:23 PM Muchun Song <songmuchun@bytedance.com> wrote:
>
> On Thu, Apr 7, 2022 at 8:38 AM NeilBrown <neilb@suse.de> wrote:
> >
> > On Thu, 07 Apr 2022, Trond Myklebust wrote:
> > > On Wed, 2022-04-06 at 16:25 +0200, Sebastian Fricke wrote:
> > > > [You don't often get email from sebastian.fricke@collabora.com. Learn
> > > > why this is important at
> > > > http://aka.ms/LearnAboutSenderIdentification.]
> > > >
> > > > Hello folks,
> > > >
> > > > I am currently developing a V4L2 driver with support on GStreamer,
> > > > for
> > > > that purpose I am mounting the GStreamer repository via NFS from my
> > > > development machine to the target ARM64 hardware.
> > > >
> > > > I just switched to the latest kernel and got a sudden hang up of my
> > > > system.
> > > > What I did was a rebase of the GStreamer repository and then I wanted
> > > > to
> > > > build it with ninja on the target, this failed with a segmentation
> > > > fault:
> > > > ```
> > > > gstreamer| Configuring libgstreamer-1.0.so.0.2100.0-gdb.py using
> > > > configurat=
> > > > ion
> > > > Segmentation fault
> > ....
> >
> > > > [ 4595.209552] pc : list_lru_add+0xd4/0x180
> > > > [ 4595.209907] lr : list_lru_add+0x15c/0x180
> >
> > This is almost certainly fixed by the patch at
> >
> > https://lore.kernel.org/all/164876616694.25542.14010655277238655246@noble.neil.brown.name/
> >
> > which almost landed in -mm, but didn't quite.
> >
> > The subsequent email
> >
> > https://lore.kernel.org/all/CAMZfGtUMyag7MHxmg7E1_xmyZ7NDPt62e-qXbqa8nJHFC72=3w@mail.gmail.com/
> >
> > suggests a one-line change.
> >
> > Trond: maybe you could queue this?
> >
> Hi NeilBrown,
>
> The complete patch could be found here. Please
> queue this one.
>
> [1] https://lore.kernel.org/all/20220401025905.49771-1-songmuchun@bytedance.com/
>
> Thanks.