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Subject: Re: Linux 5.11-rc5
From:   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>
To:     Mike Rapoport <rppt@linux.ibm.com>
Date:   Mon, 25 Jan 2021 21:13:59 +0000
Message-ID: <161160923954.29150.8571056944016500691@build.alporthouse.com>
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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.
-Chris