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

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Message-ID: <CANp29Y6YgrQ4pX+JXY1SBtmFYc2ThyHUA6GAEVMh5hqu6Q0FdA@mail.gmail.com>
Date:   Thu, 27 Jul 2023 21:12:36 +0200
From:   Aleksandr Nogikh <nogikh@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     syzbot <syzbot+8645fe63c4d22c8d27b8@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, liam.howlett@...cle.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] WARNING: suspicious RCU usage in mas_walk (2)

On Thu, Jul 27, 2023 at 8:54 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Thu, Jul 27, 2023 at 11:53:02AM -0700, syzbot wrote:
> > > On Tue, Jul 25, 2023 at 11:57:22PM -0700, syzbot wrote:
> > >> syzbot has bisected this issue to:
> > >>
> > >> commit a52f58b34afe095ebc5823684eb264404dad6f7b
> > >> Author: Matthew Wilcox (Oracle) <willy@...radead.org>
> > >> Date:   Mon Jul 24 18:54:10 2023 +0000
> > >>
> > >>     mm: handle faults that merely update the accessed bit under the VMA lock
> > >>
> > >> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1783585ea80000
> > >> start commit:   [unknown]
> > >> git tree:       linux-next
> > >
> > > #syz test linux-next a52f58b34afe095ebc5823684eb264404dad6f7b
> >
> > "linux-next" does not look like a valid git repo address.
>
> Well, now, that's your fault, isn't it?  You're abbreviating the git
> tree in the report, but then refusing to accept the abbreviation in
> the response.

Good point.
There's an issue about this
(https://github.com/google/syzkaller/issues/2265), I've added it to my
backlog.

-- 
Aleksandr