linux-kernel - Re: [PATCH 5.15 000/159] 5.15.116-rc1 review

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Date:   Sat, 10 Jun 2023 21:23:47 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, patches@...ts.linux.dev,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        akpm@...ux-foundation.org, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        srw@...dewatkins.net, rwarsow@....de,
        Thomas Gleixner <tglx@...utronix.de>,
        Ido Schimmel <idosch@...dia.com>
Subject: Re: [PATCH 5.15 000/159] 5.15.116-rc1 review

Hi!

> > Build results:
> > 	total: 155 pass: 155 fail: 0
> > Qemu test results:
> > 	total: 499 pass: 498 fail: 1
> > Failed tests:
> > 	arm:kudo-bmc:multi_v7_defconfig:npcm:usb0.1:nuvoton-npcm730-kudo:rootfs
> > 
> > The test failure is spurious and not new. I observe it randomly on
> > multi_v7_defconfig builds, primarily on npcm platforms. There is no error
> > message, just a stalled boot. I have been trying to bisect for a while,
> > but I have not been successful so far. No immediate concern; I just wanted
> > to mention it in case someone else hits the same or a similar problem.
> > 
> 
> I managed to revise my bisect script sufficiently enough to get reliable
> results. It looks like the culprit is commit 503e554782c9 (" debugobject:
> Ensure pool refill (again)"); see bisect log below. Bisect on four
> different systems all have the same result. After reverting this patch,
> I do not see the problem anymore (again, confirmed on four different
> systems). If anyone has an idea how to debug this, please let me know.
> I'll be happy to give it a try.

You may want to comment out debug_objects_fill_pool() in
debug_object_activate or debug_object_assert_init to see which one is
causing the failure...

CONFIG_PREEMPT_RT is disabled for you, right? (Should 5.15 even have
that option?)

Best regards,
								Pavel
-- 
DENX Software Engineering GmbH,        Managing Director: Erika Unter
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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