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From:   Anatoly Pugachev <matorola@gmail.com>
Date:   Mon, 26 Sep 2022 16:06:08 +0300
Message-ID: <CADxRZqyAG5Co9hLEp6p8vPC9WyGERR6un-3Rqapyv14G4vPXJw@mail.gmail.com>
Subject: Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set
 proper memcg for net_init hooks allocations)
To:     =?UTF-8?Q?Michal_Koutn=C3=BD?= <mkoutny@suse.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>
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On Wed, Sep 21, 2022 at 8:03 PM Michal Koutn=C3=BD <mkoutny@suse.com> wrote=
:
> On Wed, Sep 21, 2022 at 05:44:56PM +0300, Anatoly Pugachev <matorola@gmai=
l.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 d=
oes 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.)

mator@ttip:~/dmesg$ zcat config-6.0.0-rc6-00010-gb7f0f527dc3c.gz | grep VME=
MMAP
CONFIG_SPARSEMEM_VMEMMAP_ENABLE=3Dy
CONFIG_SPARSEMEM_VMEMMAP=3Dy

I do upload config and boot logs to
https://github.com/mator/sparc64-dmesg

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-g=
b7f0f527dc3c.gz