linux-kernel - Re: [PATCH 5.15 000/923] 5.15.3-rc3 review

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Message-ID: <7bc0d46b-1412-a630-bbf7-57e7ec702784@roeck-us.net>
Date:   Wed, 17 Nov 2021 22:26:31 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kees Cook <keescook@...omium.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Holger Hoffstätte <holger@...lied-asynchrony.com>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Justin Forbes <jmforbes@...uxtx.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, Pavel Machek <pavel@...x.de>,
        Jon Hunter <jonathanh@...dia.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        stable <stable@...r.kernel.org>,
        Wang Yugui <wangyugui@...-tech.com>,
        François Guerraz <kubrick@...6.net>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 5.15 000/923] 5.15.3-rc3 review

On 11/17/21 4:16 PM, Kees Cook wrote:
> On Wed, Nov 17, 2021 at 03:50:17PM -0800, Linus Torvalds wrote:
>> Sorry for top-posting and quoting this all, but the actual people
>> involved with the wchan changes don't seem to be on the participant
>> list.
> 
> Adding more folks from a private report and
> https://bugzilla.kernel.org/show_bug.cgi?id=215031
> 
> and for the new people, here's a lore link for this thread:
> https://lore.kernel.org/stable/YZV02RCRVHIa144u@fedora64.linuxtx.org/
> 
> 
> FWIW, earlier bisection pointed to the stable backport of
> 5d1ceb3969b6b2e47e2df6d17790a7c5a20fcbb4 being the primary culprit.
> At first glance it seems to me that the problem with -stable is that an
> unvetted subset of the wchan refactoring series landed in -stable.
> 

Can the (partial) wchan backport possibly be dropped from v5.15.y until
someone figures out what exactly - if anything - is needed ?

Thanks,
Guenter