linux-kernel - Re: KASAN: invalid-access Read in kmem_cache

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Date:   Wed, 27 Jan 2021 20:50:10 +0100
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+2a52b6c31dbefb1e9d9f@...kaller.appspotmail.com>,
        Amit Kachhap <amit.kachhap@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>, mbenes@...e.cz,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Will Deacon <will@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Mark Brown <broonie@...nel.org>
Subject: Re: KASAN: invalid-access Read in kmem_cache_destroy

On Wed, Jan 27, 2021 at 6:44 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Wed, Jan 27, 2021 at 06:14:13PM +0100, Dmitry Vyukov wrote:
> > On Wed, Jan 27, 2021 at 5:58 PM syzbot
> > <syzbot+2a52b6c31dbefb1e9d9f@...kaller.appspotmail.com> wrote:
> > >
> > > Hello,
> > >
> > > syzbot found the following issue on:
> > >
> > > HEAD commit:    2ab38c17 mailmap: remove the "repo-abbrev" comment
> > > git tree:       upstream
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=12eb4ad8d00000
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=ad43be24faf1194c
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=2a52b6c31dbefb1e9d9f
> > > userspace arch: arm64
> > >
> > > Unfortunately, I don't have any reproducer for this issue yet.
> > >
> > > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > > Reported-by: syzbot+2a52b6c31dbefb1e9d9f@...kaller.appspotmail.com
> >
> > This happens on arm64 instance with MTE enabled.
> > I don't see any corresponding reports on x86_64. So I would assume
> > it's a generic latent bug, or probably more likely a bug in MTE
> > support.
>
> Copying in Vincenso who's done a bunch of MTE stuff recently.

Could be the same issue as:

https://lkml.org/lkml/2021/1/27/1109