linux-kernel - Re: clk_imx8mp_audiomix_runtime_resume Kernel panic regression on v6.12

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Message-ID: <Zzde9xS0zGJhcoUb@gaggiata.pivistrello.it>
Date: Fri, 15 Nov 2024 15:47:19 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Shengjiu Wang <shengjiu.wang@...il.com>
Cc: Francesco Dolcini <francesco@...cini.it>,
	Shengjiu Wang <shengjiu.wang@....com>, Frank Li <frank.li@....com>,
	abelvesa@...nel.org, peng.fan@....com, mturquette@...libre.com,
	sboyd@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
	linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, regressions@...ts.linux.dev,
	Adam Ford <aford173@...il.com>,
	Alexander Stein <alexander.stein@...tq-group.com>,
	Mark Brown <broonie@...nel.org>, ulf.hansson@...aro.org
Subject: Re: clk_imx8mp_audiomix_runtime_resume Kernel panic regression on
 v6.12

On Fri, Nov 15, 2024 at 11:13:58AM +0800, Shengjiu Wang wrote:
> On Tue, Nov 12, 2024 at 5:20 PM Francesco Dolcini <francesco@...cini.it> wrote:
> >
> > On Tue, Nov 12, 2024 at 08:59:58AM +0100, Francesco Dolcini wrote:
> > > On Mon, Oct 07, 2024 at 03:25:55PM +0200, Francesco Dolcini wrote:
> > > > it seems that an old regression is back on v6.12, reproduced on -rc2
> > > > (not sure about rc1).
> > > >
> > > > The original report is from https://lore.kernel.org/all/20240424164725.GA18760@francesco-nb/
> > > > and it was fixed with https://lore.kernel.org/all/1715396125-3724-1-git-send-email-shengjiu.wang@nxp.com/.
> > > >
> > > > Is it now back?
> > >
> > > I was able to reproduce this issue once more, this time with 6.11.7.
> > > As I wrote in another email the issue is not systematic as it used to
> > > be.
> > >
> > > Any idea?
> >
> > Frank, Shengjiu, could it be that the udelay(5) in imx_pgc_power_up() is
> > too short and therefore we have such non-systematic failures?
> >
> 
> Francesco,  it seems hard to reproduce it on my i.MX8MP-EVK board.
> 
> If it is easy to reproduce on your side, you can try to enlarge the delay
> time to see if there is any improvement.

It's hard also for me to reproduce, we just have a relatively extensive
test farm and 2 times it happened while doing unrelated tests. I was hoping we
could have some idea on what's going on, I'll see if I can put together some
kind of stress test, being able to reproduce it more systematically would
certainly help.

Francesco