linux-kernel - Re: [PATCH] mapletree-vs-khugepaged

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Message-ID: <28f3958f-dd25-cb1a-0a4c-040e7706ffc7@roeck-us.net>
Date:   Thu, 19 May 2022 14:41:55 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Liam Howlett <liam.howlett@...cle.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mapletree-vs-khugepaged

On 5/19/22 07:35, Liam Howlett wrote:
> * Guenter Roeck <linux@...ck-us.net> [220517 10:32]:
> 
> ...
>>
>> Another bisect result, boot failures with nommu targets (arm:mps2-an385,
>> m68k:mcf5208evb). Bisect log is the same for both.
> ...
>> # first bad commit: [bd773a78705fb58eeadd80e5b31739df4c83c559] nommu: remove uses of VMA linked list
> 
> I cannot reproduce this on my side, even with that specific commit.  Can
> you point me to the failure log, config file, etc?  Do you still see
> this with the fixes I've sent recently?
> 

This was in linux-next; most recently with next-20220517.
I don't know if that was up-to-date with your patches.
The problem seems to be memory allocation failures.
A sample log is at
https://kerneltests.org/builders/qemu-m68k-next/builds/1065/steps/qemubuildcommand/logs/stdio
The log history at
https://kerneltests.org/builders/qemu-m68k-next?numbuilds=30
will give you a variety of logs.

The configuration is derived from m5208evb_defconfig, with initrd
and command line embedded in the image. You can see the detailed
configuration updates at
https://github.com/groeck/linux-build-test/blob/master/rootfs/m68k/run-qemu-m68k.sh

Qemu command line is

qemu-system-m68k -M mcf5208evb -kernel vmlinux \
     -cpu m5208 -no-reboot -nographic -monitor none
     -append "rdinit=/sbin/init console=ttyS0,115200"

with initrd from
https://github.com/groeck/linux-build-test/blob/master/rootfs/m68k/rootfs-5208.cpio.gz

I use qemu v6.2, but any recent qemu version should work.

Hope this helps,
Guenter