From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jakub Kicinski <kuba-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Subject: Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set
 proper memcg for net_init hooks allocations)
Date: Mon, 26 Sep 2022 10:28:12 -0700
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To: Vasily Averin <vvs-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org>, Shakeel Butt <shakeelb-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Anatoly Pugachev <matorola-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Michal =?UTF-8?B?S291dG7DvQ==?= <mkoutny-IBi9RG/b67k@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, kernel-GEFAQzZX7r8dnm+yROfE0A@public.gmane.org, Linux Kernel list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, linux-mm <linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org>, Roman Gushchin <roman.gushchin-fxUVXftIFDnyG1zEObXtfA@public.gmane.org>, Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>, Michal Hocko <mhocko-IBi9RG/b67k@public.gmane.org>, Florian Westphal <fw-HFFVJYpyMKqzQB+pC5nmwQ@public.gmane.org>, "David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>, Paolo Abeni <pabeni-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Sparc kernel list <sparclinux-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Thorsten Leemhuis <linux-rCxcAJFjeRkk+I/owrrOrA@public.gmane.org>, Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>

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-IBi9RG/b67k@public.gmane.org> 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?