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Date:   Tue, 26 Jan 2021 18:37:59 +0200
From:   Mike Rapoport <rppt@linux.ibm.com>
To:     Chris Wilson <chris@chris-wilson.co.uk>
Cc:     Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 5.11-rc5
Message-ID: <20210126163759.GD196782@linux.ibm.com>
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On Mon, Jan 25, 2021 at 09:13:59PM +0000, Chris Wilson wrote:
> Quoting Mike Rapoport (2021-01-25 21:04:56)
> > On Mon, Jan 25, 2021 at 08:34:34PM +0000, Chris Wilson 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.
> > > 
> > > 17:56              tsa : ickle: dolphin: I hit the following patch in my bisection, and the hang is also dependent on kconfig
> > > 17:56              tsa : first bad commit: [d3921cb8be29ce5668c64e23ffdaeec5f8c69399] mm: fix initialization of struct page for holes in
> > >                          memory layout
> > > 17:57              tsa : couldn't reproduce on older CI kconfig, current one does it
> > >                          https://gitlab.freedesktop.org/gfx-ci/i915-infra/-/blob/master/kconfig/debug
> > > 
> > > Here's a boot dmesg from some affected machines from just before the merge
> > > with rc5:
> > > https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_9676/shard-skl1/boot18.txt
> > > https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_9676/fi-skl-6600u/boot.html
> > > https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_9676/fi-bsw-cyan/boot.html
> > > https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_9676/fi-bdw-samus/boot.html
> > 
> > Is there any way to get early console from these machines?
> 
> 12:16 tsa : none of those have good hook for serial
> 
> Nothing on the console and no serial console option, and panics before
> netconsole.
> 
> Maybe some early_printk and boot_delay if you think there's something to
> see with those, but I'll have to ask Tomi nicely tomorrow.

I think there could be an early panic at some point of mm initialization.
So if it was possible to see early printks somehow that would have been
helpful. 

> -Chris

-- 
Sincerely yours,
Mike.