linux-kernel - Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set proper memcg for net

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Date:   Wed, 21 Sep 2022 19:02:59 +0200
From:   Michal Koutný <mkoutny@...e.com>
To:     Anatoly Pugachev <matorola@...il.com>
Cc:     Vasily Averin <vvs@...nvz.org>,
        Andrew Morton <akpm@...ux-foundation.org>, kernel@...nvz.org,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.com>,
        Florian Westphal <fw@...len.de>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>, cgroups@...r.kernel.org,
        Sparc kernel list <sparclinux@...r.kernel.org>
Subject: Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set
 proper memcg for net_init hooks allocations)

Hello.

Thanks for the report.

On Wed, Sep 21, 2022 at 05:44:56PM +0300, Anatoly Pugachev <matorola@...il.com> wrote:
> On Sun, Sep 18, 2022 at 12:39 PM Anatoly Pugachev <matorola@...il.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@...p:~/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