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Subject: Re: Linux 5.11-rc5
From:   Chris Wilson <chris@chris-wilson.co.uk>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Mike Rapoport <rppt@linux.ibm.com>
Date:   Mon, 25 Jan 2021 21:46:19 +0000
Message-ID: <161161117911.29150.13853544418926100149@build.alporthouse.com>
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Quoting Mike Rapoport (2021-01-25 21:33:48)
> On Mon, Jan 25, 2021 at 12:49:39PM -0800, Linus Torvalds wrote:
> > On Mon, Jan 25, 2021 at 12:35 PM Chris Wilson <chris@chris-wilson.co.uk> wrote:
> > >
> > > Quoting Linus Torvalds (2021-01-25 01:06:40)
> > > > Mike Rapoport (3):
> > > ...
> > > >       mm: fix initialization of struct page for holes in memory layout
> > >
> > > We have half a dozen or so different machines in CI that are silently
> > > failing to boot, that we believe is bisected to this patch.
> > 
> > That commit reverts cleanly - so if you can verify that reverting it
> > fixes your CI machines, I think that that's the right thing to do for
> > now, unless Mike can figure out some obvious "Duh!" moment from your
> > working dmesg.
> 
> Unfortunately not, at least at 11pm :(
> Maybe tomorrow I'll have something smarter to say.

CI does confirm that the revert of d3921cb8be29 brings the machines back
to life.
  
> > Mike: should we perhaps revert the first patch too (commit
> > bde9cfa3afe4: "x86/setup: don't remove E820_TYPE_RAM for pfn 0")?
> 
> I wonder, maybe actually this one is causing troubles?
> 
> Chris, would it be possible to check what happens if you revert only
> bde9cfa3afe4?

Queued for CI, will be run in about an hour.
-Chris