Re: [syzbot] [kernfs?] WARNING: suspicious RCU usage in mas_start

[Aleksandr Nogikh]

On Thu, Apr 27, 2023 at 7:31 PM syzbot
<syzbot+d79e205d463e603f47ff@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 6db504ce55bdbc575723938fc480713c9183f6a2
> Author: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
> 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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