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From:   Aleksandr Nogikh <nogikh@google.com>
Date:   Thu, 27 Apr 2023 19:47:47 +0200
Message-ID: <CANp29Y4pMRV8ATp+Xb4qAap=m0ruUnNzSgwSbVqomp-FJvTdVg@mail.gmail.com>
Subject: Re: [syzbot] [kernfs?] WARNING: suspicious RCU usage in mas_start
To:     syzbot <syzbot+d79e205d463e603f47ff@syzkaller.appspotmail.com>
Cc:     Liam.Howlett@oracle.com, akpm@linux-foundation.org,
        david@redhat.com, gregkh@linuxfoundation.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com, tj@kernel.org
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On Thu, Apr 27, 2023 at 7:31=E2=80=AFPM syzbot
<syzbot+d79e205d463e603f47ff@syzkaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 6db504ce55bdbc575723938fc480713c9183f6a2
> Author: Liam R. Howlett <Liam.Howlett@oracle.com>
> Date:   Wed Mar 8 22:03:10 2023 +0000
>
>     mm/ksm: fix race with VMA iteration and mm_struct teardown
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=3D1674715fc8=
0000
> start commit:   f3a2439f20d9 Merge tag 'rproc-v6.3' of git://git.kernel.o=
r..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Ddd442ddf29eac=
a0c
> dashboard link: https://syzkaller.appspot.com/bug?extid=3Dd79e205d463e603=
f47ff
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=3D12cfaf1cc80=
000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=3D149edbf0c8000=
0
>
> If the result looks correct, please mark the issue as fixed by replying w=
ith:
>
> #syz fix: mm/ksm: fix race with VMA iteration and mm_struct teardown

Seems reasonable.
#syz fix: mm/ksm: fix race with VMA iteration and mm_struct teardown
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisect=
ion
>
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