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Date:   Mon, 26 Sep 2022 10:28:12 -0700
From:   Jakub Kicinski <kuba@kernel.org>
To:     Vasily Averin <vvs@openvz.org>, Shakeel Butt <shakeelb@google.com>
Cc:     Anatoly Pugachev <matorola@gmail.com>,
        Michal =?UTF-8?B?S291dG7DvQ==?= <mkoutny@suse.com>,
        Andrew Morton <akpm@linux-foundation.org>, kernel@openvz.org,
        Linux Kernel list <linux-kernel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        Roman Gushchin <roman.gushchin@linux.dev>,
        Vlastimil Babka <vbabka@suse.cz>,
        Michal Hocko <mhocko@suse.com>,
        Florian Westphal <fw@strlen.de>,
        "David S. Miller" <davem@davemloft.net>,
        Paolo Abeni <pabeni@redhat.com>,
        Eric Dumazet <edumazet@google.com>, cgroups@vger.kernel.org,
        Sparc kernel list <sparclinux@vger.kernel.org>,
        Thorsten Leemhuis <linux@leemhuis.info>,
        Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set
 proper memcg for net_init hooks allocations)
Message-ID: <20220926102812.2b0696a7@kernel.org>
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On Mon, 26 Sep 2022 16:06:08 +0300 Anatoly Pugachev wrote:
> On Wed, Sep 21, 2022 at 8:03 PM Michal Koutn=C3=BD <mkoutny@suse.com> wro=
te:
> > On Wed, Sep 21, 2022 at 05:44:56PM +0300, Anatoly Pugachev <matorola@gm=
ail.com> wrote: =20
> > > reverting this patch makes my sparc64 box boot successfully. =20
> >
> > The failed address falls into vmmemmap region (per your boot log
> > output). It looks like the respective page/folio (of init_net struct) is
> > unbacked there (and likely folio_test_slab fails dereferencing ->flags).
> >
> > Would you mind sharing your kernel's config?
> > (I'm most curious about CONFIG_SPARSMEM_VMEMMAP, I'm not familiar with
> > your arch at all though.) =20
>=20
> mator@ttip:~/dmesg$ zcat config-6.0.0-rc6-00010-gb7f0f527dc3c.gz | grep V=
MEMMAP
> CONFIG_SPARSEMEM_VMEMMAP_ENABLE=3Dy
> CONFIG_SPARSEMEM_VMEMMAP=3Dy
>=20
> I do upload config and boot logs to
> https://github.com/mator/sparc64-dmesg
>=20
> building a new kernel version/releases as 'make olddefconfig && make -j'
> current version of booted 6.0.0-rc6 is available as
> https://github.com/mator/sparc64-dmesg/blob/master/config-6.0.0-rc6-00010=
-gb7f0f527dc3c.gz

Forgive my uniformed chime-in but Linus seemed happy with the size of
-rc7 and now I'm worried there won't be an -rc8. AFAICT this is a 6.0
regression. Vasily, Shakeel, do we have a plan to fix this?