linux-kernel - Re: "reuse mergeable anon_vma as parent when fork" causes a crash on s390

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Date:   Wed, 9 Oct 2019 17:04:18 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Qian Cai <cai@....pw>, Wei Yang <richardw.yang@...ux.intel.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Rik van Riel <riel@...riel.com>,
        Linux MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-s390@...r.kernel.org, Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: "reuse mergeable anon_vma as parent when fork" causes a crash
 on s390

On Wed, 9 Oct 2019 15:21:11 -0700 Shakeel Butt <shakeelb@...gle.com> wrote:

> On Wed, Oct 9, 2019 at 2:30 PM Qian Cai <cai@....pw> wrote:
> >
> > The linux-next commit "mm/rmap.c: reuse mergeable anon_vma as parent when fork"
> > [1] causes a crash on s390 while compiling some C code. Reverted it fixes the
> > issue.
> >
> > [1] https://lore.kernel.org/lkml/20191004160632.30251-1-richardw.yang@linux.intel.com/
> >
>
> ...
>
> Our internal syzbot instance also hit this bug and bisected to the same patch.

Thanks, I'll drop
mm-rmapc-reuse-mergeable-anon_vma-as-parent-when-fork.patch.