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Date:   Wed, 21 Sep 2022 19:02:59 +0200
From:   Michal =?iso-8859-1?Q?Koutn=FD?= <mkoutny@suse.com>
To:     Anatoly Pugachev <matorola@gmail.com>
Cc:     Vasily Averin <vvs@openvz.org>,
        Andrew Morton <akpm@linux-foundation.org>, kernel@openvz.org,
        Linux Kernel list <linux-kernel@vger.kernel.org>,
        linux-mm <linux-mm@kvack.org>,
        Shakeel Butt <shakeelb@google.com>,
        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>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Eric Dumazet <edumazet@google.com>, cgroups@vger.kernel.org,
        Sparc kernel list <sparclinux@vger.kernel.org>
Subject: Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set
 proper memcg for net_init hooks allocations)
Message-ID: <20220921170259.GI8331@blackbody.suse.cz>
References: <6b362c6e-9c80-4344-9430-b831f9871a3c@openvz.org>
 <f9394752-e272-9bf9-645f-a18c56d1c4ec@openvz.org>
 <20220918092849.GA10314@u164.east.ru>
 <CADxRZqyyHAtzaaPjcKi8AichGew2yi-_vQcKoLoxPanLvXZL0g@mail.gmail.com>
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Hello.

Thanks for the report.

On Wed, Sep 21, 2022 at 05:44:56PM +0300, Anatoly Pugachev <matorola@gmail.com> wrote:
> On Sun, Sep 18, 2022 at 12:39 PM Anatoly Pugachev <matorola@gmail.com> wrote:
> >
> >
> > I'm unable to boot my sparc64 VM anymore (5.19 still boots, 6.0-rc1 does not),
> > bisected up to this patch,
> >
> > mator@ttip:~/linux-2.6$ git bisect bad
> > 1d0403d20f6c281cb3d14c5f1db5317caeec48e9 is the first bad commit
> > commit 1d0403d20f6c281cb3d14c5f1db5317caeec48e9
> 
> reverting this patch makes my sparc64 box boot successfully.

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.)

Thanks,
Michal