linux-kernel - Re: KASAN vs RCU vs RT

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Message-ID: <20200928093323.06c82fdc@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Mon, 28 Sep 2020 09:33:23 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: KASAN vs RCU vs RT

On Sat, 26 Sep 2020 08:57:32 +0200 Dmitry Vyukov wrote:
> On Sat, Sep 26, 2020 at 3:43 AM Jakub Kicinski <kuba@...nel.org> wrote:
> >
> > Hi!
> >
> > I couldn't find this being reported in a quick search, so let me ask.
> >
> > With 5.9 I'm seeing a lot (well, once a boot) splats like the one below.
> >
> > Is there a fix?  
> 
> Hi Jakub,
> 
> FWIW this is the first time I see this BUG. I don't remember it was
> mentioned on kasan-dev before.
> 
> The commit that added this BUG was added in March 2020, so is not new...

Talking to Paul McKenney - it appears to be a known and hard to fix
issue inside RCU, KASAN is not to blame. Sorry for the noise :)