linux-kernel - Re: [PATCH 6.4 000/227] 6.4.7-rc1 review

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Date:   Thu, 27 Jul 2023 09:26:52 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Pavel Machek <pavel@...x.de>
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, linux@...ck-us.net, shuah@...nel.org,
        patches@...nelci.org, lkft-triage@...ts.linaro.org,
        jonathanh@...dia.com, f.fainelli@...il.com,
        sudipm.mukherjee@...il.com, srw@...dewatkins.net, rwarsow@....de,
        conor@...nel.org, rcu@...r.kernel.org
Subject: Re: [PATCH 6.4 000/227] 6.4.7-rc1 review



> On Jul 27, 2023, at 7:35 AM, Pavel Machek <pavel@...x.de> wrote:
> 
> Hi!
> 
>>> This is the start of the stable review cycle for the 6.4.7 release.
>>> There are 227 patches in this series, all will be posted as a response
>>> to this one.  If anyone has any issues with these being applied, please
>>> let me know.
>>> 
>>> Responses should be made by Thu, 27 Jul 2023 10:44:26 +0000.
>>> Anything received after that time might be too late.
>>> 
>>> The whole patch series can be found in one patch at:
>>>    https://www.kernel.org/pub/linux/kernel/v6.x/stable-review/patch-6.4.7-rc1.gz
>>> or in the git tree and branch at:
>>>    git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-6.4.y
>>> and the diffstat can be found below.
>> 
>> I saw this when running rcutorture, this one happened in the TREE04
>> configuration. This is likely due to the stuttering issues we are discussing
>> in the other thread. Anyway I am just making a note here while I am
>> continuing to look into it.
> 
> So is the stuttering new in 6.4.7?

No it is an old feature in RCU torture tests. But is dependent on timing. Something
changed in recent kernels that is making the issues with it more likely. Its hard to bisect as failure sometimes takes hours.

> 
>> Other than that, all tests pass:
>> Tested-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> 
> ...or you still believe 6.4.7 is okay to release?

As such, it should be Ok. However naturally I am not happy that the RCU testing
is intermittently failing. These issues have been seen in last several 6.4 stable releases
so since those were released, maybe this one can be too?
The fix for stuttering is currently being reviewed.

Thanks, 

- Joel 


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