linux-kernel - Re: Droid 4 boot failure due to 422580c3cea7 (mm/oom_kill.c: add tracepoints for oom reaper-related events)

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Message-ID: <20170714172343.szrjbeob5alpgzpe@earth>
Date:   Fri, 14 Jul 2017 19:23:43 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Roman Gushchin <guro@...com>
Cc:     Michal Hocko <mhocko@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tony Lindgren <tony@...mide.com>,
        Linux-Kernel <linux-kernel@...r.kernel.org>,
        Linux-OMAP <linux-omap@...r.kernel.org>
Subject: Re: Droid 4 boot failure due to 422580c3cea7 (mm/oom_kill.c: add
 tracepoints for oom reaper-related events)

Hi,

On Fri, Jul 14, 2017 at 02:12:21PM +0000, Roman Gushchin wrote:
> > On 14 Jul 2017, at 14:43, Sebastian Reichel <sebastian.reichel@...labora.co.uk> wrote:
> > I just bisected another issue breaking boot on Droid 4. My
> > bisect points to 422580c3cea7 (mm/oom_kill.c: add tracepoints
> > for oom reaper-related events). It do not see any message
> > printed to UART (with earlyprintk) once that commit is part
> > of my image. Kernel config is below.

> This is really interesting, because this patch adds few
> tracepoints and all of them are called from the oom code, which is
> hopefully not a part of the boot process.
> 
> Can you, please, confirm, that it can be reproduced with some
> confidence? If so, can you, please, eliminate the tracepoints
> calls and try to reproduce the boot failure?

I can boot 9967468c0a10 ("Merge branch 'akpm' (patches from
Andrew)") after adding

 - http://git.kernel.org/tip/19d39a3810e7032f311ef83effdac40339b9d022
   (another issue, that breaks Droid 4 boot)
 - a git revert of 422580c3cea7

OTOH there are strange problems. Using da16dd9785f8 + above
two commits also works. Using b5e16170f59b + above commits
does not work and bisection ended up in the merge commit.

-- Sebastian

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