linux-kernel - Re: [syzbot] [kernfs?] WARNING: suspicious RCU usage in mas

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Date:   Thu, 27 Apr 2023 19:47:47 +0200
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     syzbot <syzbot+d79e205d463e603f47ff@...kaller.appspotmail.com>
Cc:     Liam.Howlett@...cle.com, akpm@...ux-foundation.org,
        david@...hat.com, gregkh@...uxfoundation.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tj@...nel.org
Subject: Re: [syzbot] [kernfs?] WARNING: suspicious RCU usage in mas_start

On Thu, Apr 27, 2023 at 7:31 PM syzbot
<syzbot+d79e205d463e603f47ff@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 6db504ce55bdbc575723938fc480713c9183f6a2
> Author: Liam R. Howlett <Liam.Howlett@...cle.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=1674715fc80000
> start commit:   f3a2439f20d9 Merge tag 'rproc-v6.3' of git://git.kernel.or..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=dd442ddf29eaca0c
> dashboard link: https://syzkaller.appspot.com/bug?extid=d79e205d463e603f47ff
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12cfaf1cc80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=149edbf0c80000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #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#bisection
>
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