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From:   Muchun Song <songmuchun@bytedance.com>
Date:   Thu, 7 Apr 2022 09:32:50 +0800
Message-ID: <CAMZfGtUKmTS51G+SGSLCyCXsae-Z7OD2yo35G7FD5UD9rewerw@mail.gmail.com>
Subject: Re: Possible NFS4 regression on 5.18-rc1
To:     NeilBrown <neilb@suse.de>
Cc:     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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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.