Re: [sparc64] fails to boot, (was: Re: [PATCH memcg v6] net: set proper memcg for net_init hooks allocations)

[Michal Koutný]

Hello.

Thanks for the report.

On Wed, Sep 21, 2022 at 05:44:56PM +0300, Anatoly Pugachev <matorola@xxxxxxxxx> wrote:
> On Sun, Sep 18, 2022 at 12:39 PM Anatoly Pugachev <matorola@xxxxxxxxx> 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