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

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Date:   Mon, 26 Sep 2022 16:06:08 +0300
From:   Anatoly Pugachev <matorola@...il.com>
To:     Michal Koutný <mkoutny@...e.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)

On Wed, Sep 21, 2022 at 8:03 PM Michal Koutný <mkoutny@...e.com> wrote:
> 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.)

mator@...p:~/dmesg$ zcat config-6.0.0-rc6-00010-gb7f0f527dc3c.gz | grep VMEMMAP
CONFIG_SPARSEMEM_VMEMMAP_ENABLE=y
CONFIG_SPARSEMEM_VMEMMAP=y

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-gb7f0f527dc3c.gz