linux-kernel - Re: [next-20180711][Oops] linux-next kernel boot is broken on powerpc

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Message-ID: <CAGM2reav2giqHjUTWADWzqb-8m7AqUBJxerA1Oc+4YJhTLXrDA@mail.gmail.com>
Date:   Tue, 17 Jul 2018 22:00:20 -0400
From:   Pavel Tatashin <pasha.tatashin@...cle.com>
To:     abdhalee@...ux.vnet.ibm.com
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        sachinp@...ux.vnet.ibm.com, Michal Hocko <mhocko@...e.com>,
        sim@...ux.vnet.ibm.com, venkatb3@...ibm.com,
        LKML <linux-kernel@...r.kernel.org>, manvanth@...ux.vnet.ibm.com,
        Linux Memory Management List <linux-mm@...ck.org>,
        linux-next@...r.kernel.org, aneesh.kumar@...ux.vnet.ibm.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [next-20180711][Oops] linux-next kernel boot is broken on powerpc

On Tue, Jul 17, 2018 at 6:49 AM Abdul Haleem
<abdhalee@...ux.vnet.ibm.com> wrote:
>
> On Sat, 2018-07-14 at 10:55 +1000, Stephen Rothwell wrote:
> > Hi Abdul,
> >
> > On Fri, 13 Jul 2018 14:43:11 +0530 Abdul Haleem <abdhalee@...ux.vnet.ibm.com> wrote:
> > >
> > > On Thu, 2018-07-12 at 13:44 -0400, Pavel Tatashin wrote:
> > > > > Related commit could be one of below ? I see lots of patches related to mm and could not bisect
> > > > >
> > > > > 5479976fda7d3ab23ba0a4eb4d60b296eb88b866 mm: page_alloc: restore memblock_next_valid_pfn() on arm/arm64
> > > > > 41619b27b5696e7e5ef76d9c692dd7342c1ad7eb mm-drop-vm_bug_on-from-__get_free_pages-fix
> > > > > 531bbe6bd2721f4b66cdb0f5cf5ac14612fa1419 mm: drop VM_BUG_ON from __get_free_pages
> > > > > 479350dd1a35f8bfb2534697e5ca68ee8a6e8dea mm, page_alloc: actually ignore mempolicies for high priority allocations
> > > > > 088018f6fe571444caaeb16e84c9f24f22dfc8b0 mm: skip invalid pages block at a time in zero_resv_unresv()
> > > >
> > > > Looks like:
> > > > 0ba29a108979 mm/sparse: Remove CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER
> > > >
> > > > This patch is going to be reverted from linux-next. Abdul, please
> > > > verify that issue is gone once  you revert this patch.
> > >
> > > kernel booted fine when the above patch is reverted.
> >
> > And it has been removed from linux-next as of next-20180713.  (Friday
> > the 13th is not all bad :-))
>
> Hi Stephen,
>
> After reverting 0ba29a108979, our bare-metal machines boot fails with
> kernel panic, is this related ?
>
> I have attached the boot logs.

The panic happens much later in boot and looks unrelated to the
sparse_init changes.

Thank you,
Pavel