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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAA+D8AMx14hp51aH7Y=Sgu+X+_KxQ8zdJdrQHFY84nKtQsKKrw@mail.gmail.com>
Date: Tue, 19 Nov 2024 17:35:36 +0800
From: Shengjiu Wang <shengjiu.wang@...il.com>
To: Francesco Dolcini <francesco@...cini.it>
Cc: 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 10:47 PM Francesco Dolcini <francesco@...cini.it> wrote:
>
> 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.
>

With my test,  the issue reproduced with delay 5us/6us. but hard reproduced
with 7us.
I think we may need to use a delay of 10us for safety.

Best regards
Shengjiu Wang