linux-kernel - Re: [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure

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Message-Id: <F185919B-2D86-43B6-9BEC-D14D72871A58@lca.pw>
Date:   Tue, 14 Jan 2020 15:30:53 -0500
From:   Qian Cai <cai@....pw>
To:     paulmck@...nel.org
Cc:     Marco Elver <elver@...gle.com>,
        LKMM Maintainers -- Akira Yokosawa <akiyks@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        Alexander Potapenko <glider@...gle.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Boqun Feng <boqun.feng@...il.com>,
        Borislav Petkov <bp@...en8.de>, Daniel Axtens <dja@...ens.net>,
        Daniel Lustig <dlustig@...dia.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Howells <dhowells@...hat.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Joel Fernandes <joel@...lfernandes.org>,
        Jonathan Corbet <corbet@....net>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Mark Rutland <Mark.Rutland@....com>,
        Nicholas Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        linux-efi@...r.kernel.org,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer infrastructure



> On Jan 14, 2020, at 2:22 PM, Paul E. McKenney <paulmck@...nel.org> wrote:
> 
> Just so I understand...  Does this problem happen even in CONFIG_KCSAN=n
> kernels?

No.

> 
> I have been running extensive CONFIG_KSCAN=y rcutorture tests for quite
> awhile now, so even if this only happens for CONFIG_KSCAN=y, it is not
> like it affects everyone.
> 
> Yes, it should be fixed, and Marco does have a patch on the way.

The concern is really about setting KSCAN=y in a distro debug kernel where it has other debug options. I’ll try to dig into more of those issues in the next few days.