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: <20170717115128.u3caqnyiqcnuytz5@earth>
Date:   Mon, 17 Jul 2017 13:51:28 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.co.uk>
To:     Tony Lindgren <tony@...mide.com>
Cc:     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 Mon, Jul 17, 2017 at 01:17:13PM +0200, Sebastian Reichel wrote:
> [dropping people from Cc]
> 
> Hi,
> 
> On Mon, Jul 17, 2017 at 03:19:28AM -0700, Tony Lindgren wrote:
> > * Sebastian Reichel <sebastian.reichel@...labora.co.uk> [170717 02:52]:
> > > On Sun, Jul 16, 2017 at 10:59:42PM -0700, Tony Lindgren wrote:
> > > > Sebastian, for me droid 4 boots just fine with v4.13-rc1 +
> > > > 19d39a3810e if that helps. So that's with commit 422580c3cea7.
> > > 
> > > v4.13-rc1 + 19d39a3810e was also broken for me. I just disabled
> > > some unused bits in my .config and now the kernel boots with
> > > (with 422580c3cea7 that is). Maybe I hit some maximum image size
> > > limit for Droid 4?
> > > 
> > > Anyways it looks like 422580c3cea7 is not the actual problem
> > > and merely reveals some other problem.
> > 
> > OK. Maybe check kexec --image-size configuration if you have
> > a huge static kernel?
> 
> I still use the IMGSIZE=26214400 from your kexec wrapper for
> Droid 4, which should be 25MB. With the updated .config my
> image looks like this:
> 
> $ ls -lh arch/arm/boot/*Image
> -rwxr-xr-x 1 sre sre  17M Jul 17 12:44 arch/arm/boot/Image
> -rwxr-xr-x 1 sre sre 7.2M Jul 17 12:44 arch/arm/boot/zImage
> 
> Unfortunately I did not check size before I dropped the config
> options. I don't think I removed 8M of config options, but who
> knows.

I just enabled CONFIG_DEBUG_LOCKDEP=y and CONFIG_DEBUG_ATOMIC_SLEEP=y
and it did not boot again. Sizes are much smaller than kexec's
image-size parameter (26214400 - 25MB):

$ ls -l arch/arm/boot/Image
-rwxr-xr-x 1 sre sre 17768448 Jul 12 00:38 arch/arm/boot/Image

Then I increased image-size parameter to 33554432 (32MB) and it
boots again. So looks like it is a size problem. I wonder what
size this is about, though.

-- Sebastian

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