linux-kernel - Re: Fwd: Memory corruption in multithreaded user space program while calling fork

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Message-ID: <CAJuCfpGwE+ZvBVjp__9aQcbmq8MpBbeS4xUjFkjJUQY+fwyryg@mail.gmail.com>
Date:   Wed, 5 Jul 2023 10:17:52 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>, Bagas Sanjaya <bagasdotme@...il.com>,
        Jacob Young <jacobly.alt@...il.com>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Memory Management <linux-mm@...ck.org>,
        Linux PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: Fwd: Memory corruption in multithreaded user space program while
 calling fork

On Wed, Jul 5, 2023 at 9:14 AM Suren Baghdasaryan <surenb@...gle.com> wrote:
>
> On Wed, Jul 5, 2023 at 8:49 AM Andrew Morton <akpm@...ux-foundation.org> wrote:
> >
> > On Wed, 5 Jul 2023 10:51:57 +0200 "Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info> wrote:
> >
> > > >>> I'm in wait-a-few-days-mode on this.  To see if we have a backportable
> > > >>> fix rather than disabling the feature in -stable.
> > >
> > > Andrew, how long will you remain in "wait-a-few-days-mode"? Given what
> > > Greg said below and that we already had three reports I know of I'd
> > > prefer if we could fix this rather sooner than later in mainline --
> > > especially as Arch Linux and openSUSE Tumbleweed likely have switched to
> > > 6.4.y already or will do so soon.
> >
> > I'll send today's 2-patch series to Linus today or tomorrow.
>
> I need to make a correction to the patch fixing the issue (the first
> one in the series) and will post it within an hour. Thanks!

Corrected patch is posted at
https://lore.kernel.org/all/20230705171213.2843068-2-surenb@google.com/.
The other patch is unchanged but I posted v3 of the entire patchset
anyway.
Andrew, could you please replace the old version with this one before
sending it to Linus?
Thanks,
Suren.