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

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Date:   Tue, 19 Nov 2019 14:27:33 -0500
From:   Qian Cai <cai@....pw>
To:     Marco Elver <elver@...gle.com>
Cc:     akiyks@...il.com, stern@...land.harvard.edu, glider@...gle.com,
        parri.andrea@...il.com, andreyknvl@...gle.com, luto@...nel.org,
        ard.biesheuvel@...aro.org, arnd@...db.de, boqun.feng@...il.com,
        bp@...en8.de, dja@...ens.net, dlustig@...dia.com,
        dave.hansen@...ux.intel.com, dhowells@...hat.com,
        dvyukov@...gle.com, hpa@...or.com, mingo@...hat.com,
        j.alglave@....ac.uk, joel@...lfernandes.org, corbet@....net,
        jpoimboe@...hat.com, luc.maranget@...ia.fr, mark.rutland@....com,
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        tglx@...utronix.de, will@...nel.org, edumazet@...gle.com,
        kasan-dev@...glegroups.com, linux-arch@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-efi@...r.kernel.org,
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        linux-mm@...ck.org, x86@...nel.org
Subject: Re: [PATCH v4 01/10] kcsan: Add Kernel Concurrency Sanitizer
 infrastructure

On Thu, 2019-11-14 at 19:02 +0100, 'Marco Elver' via kasan-dev wrote:

> +menuconfig KCSAN
> +	bool "KCSAN: watchpoint-based dynamic data race detector"
> +	depends on HAVE_ARCH_KCSAN && !KASAN && STACKTRACE

"!KASAN" makes me sorrow. What's problem of those two?

> +	default n
> +	help
> +	  Kernel Concurrency Sanitizer is a dynamic data race detector, which
> +	  uses a watchpoint-based sampling approach to detect races. See
> +	  <file:Documentation/dev-tools/kcsan.rst> for more details.
> +