From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A7CD7C47E49 for ; Mon, 4 Nov 2019 19:47:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7647020848 for ; Mon, 4 Nov 2019 19:47:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572896824; bh=Cees/POn5MlyzydqMKd4xa2gXZtL1xZ4p3lpv82o7UE=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:List-ID: From; b=0l/H/poi0UdiLnm40ekZudNRsnoyGESGS74+qlzKeh+85LHtpOc5i6QFy+JAS7s2Y jfUOG0tDrRvsW4mN8bfuQCQtCEhhbfhe0vTNF+kmvMHnxlpfZ5KQIWlqY3y10GKh/S gQegILGbA1c9uPYZIEOp2ofJ+g8NfEQUCiozcaSk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729497AbfKDTrD (ORCPT ); Mon, 4 Nov 2019 14:47:03 -0500 Received: from mail.kernel.org ([198.145.29.99]:34776 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728346AbfKDTrC (ORCPT ); Mon, 4 Nov 2019 14:47:02 -0500 Received: from paulmck-ThinkPad-P72.home (28.234-255-62.static.virginmediabusiness.co.uk [62.255.234.28]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D3417206BA; Mon, 4 Nov 2019 19:47:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572896821; bh=Cees/POn5MlyzydqMKd4xa2gXZtL1xZ4p3lpv82o7UE=; h=Date:From:To:Cc:Subject:Reply-To:References:In-Reply-To:From; b=ONuLiO7M72Xq9WTOtOpwh4CPn9KV8D3Ij1qMMv9Uw2eqNFtVm+xp0ghv5a2594s0i 1fW3kxYMQRB0FVuOp489XqUlCg129glcwj31kvhSy0t7MudTmBOFN30246qyIEAQGJ QXAzhzODLGidol275sTx/p6VeE4+RewrO9+iR8M4= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 1FD783520B56; Mon, 4 Nov 2019 11:46:58 -0800 (PST) Date: Mon, 4 Nov 2019 11:46:58 -0800 From: "Paul E. McKenney" To: Marco Elver Cc: LKMM Maintainers -- Akira Yokosawa , Alan Stern , Alexander Potapenko , Andrea Parri , Andrey Konovalov , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Boqun Feng , Borislav Petkov , Daniel Axtens , Daniel Lustig , Dave Hansen , David Howells , Dmitry Vyukov , "H. Peter Anvin" , Ingo Molnar , Jade Alglave , Joel Fernandes , Jonathan Corbet , Josh Poimboeuf , Luc Maranget , Mark Rutland , Nicholas Piggin , Peter Zijlstra , Thomas Gleixner , Will Deacon , kasan-dev , linux-arch , "open list:DOCUMENTATION" , linux-efi@vger.kernel.org, Linux Kbuild mailing list , LKML , Linux Memory Management List , the arch/x86 maintainers Subject: Re: [PATCH v3 0/9] Add Kernel Concurrency Sanitizer (KCSAN) Message-ID: <20191104194658.GK20975@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org References: <20191104142745.14722-1-elver@google.com> <20191104164717.GE20975@paulmck-ThinkPad-P72> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 04, 2019 at 07:41:30PM +0100, Marco Elver wrote: > On Mon, 4 Nov 2019 at 17:47, Paul E. McKenney wrote: > > > > On Mon, Nov 04, 2019 at 03:27:36PM +0100, Marco Elver wrote: > > > This is the patch-series for the Kernel Concurrency Sanitizer (KCSAN). > > > KCSAN is a sampling watchpoint-based data-race detector. More details > > > are included in Documentation/dev-tools/kcsan.rst. This patch-series > > > only enables KCSAN for x86, but we expect adding support for other > > > architectures is relatively straightforward (we are aware of > > > experimental ARM64 and POWER support). > > > > > > To gather early feedback, we announced KCSAN back in September, and > > > have integrated the feedback where possible: > > > http://lkml.kernel.org/r/CANpmjNPJ_bHjfLZCAPV23AXFfiPiyXXqqu72n6TgWzb2Gnu1eA@mail.gmail.com > > > > > > We want to point out and acknowledge the work surrounding the LKMM, > > > including several articles that motivate why data-races are dangerous > > > [1, 2], justifying a data-race detector such as KCSAN. > > > [1] https://lwn.net/Articles/793253/ > > > [2] https://lwn.net/Articles/799218/ > > > > > > The current list of known upstream fixes for data-races found by KCSAN > > > can be found here: > > > https://github.com/google/ktsan/wiki/KCSAN#upstream-fixes-of-data-races-found-by-kcsan > > > > Making this more accessible to more people seems like a good thing. > > So, for the series: > > > > Acked-by: Paul E. McKenney > > Much appreciated. Thanks, Paul! > > Any suggestions which tree this could eventually land in? I would guess that Dmitry might have some suggestions. Thanx, Paul > Thanks, > -- Marco > > > > Changelog > > > --------- > > > v3: > > > * Major changes: > > > - Add microbenchmark. > > > - Add instruction watchpoint skip randomization. > > > - Refactor API and core runtime fast-path and slow-path. Compared to > > > the previous version, with a default config and benchmarked using the > > > added microbenchmark, this version is 3.8x faster. > > > - Make __tsan_unaligned __alias of generic accesses. > > > - Rename kcsan_{begin,end}_atomic -> > > > kcsan_{nestable,flat}_atomic_{begin,end} > > > - For filter list in debugfs.c use kmalloc+krealloc instead of > > > kvmalloc. > > > - Split Documentation into separate patch. > > > > > > v2: http://lkml.kernel.org/r/20191017141305.146193-1-elver@google.com > > > * Major changes: > > > - Replace kcsan_check_access(.., {true, false}) with > > > kcsan_check_{read,write}. > > > - Change atomic-instrumented.h to use __atomic_check_{read,write}. > > > - Use common struct kcsan_ctx in task_struct and for per-CPU interrupt > > > contexts. > > > > > > v1: http://lkml.kernel.org/r/20191016083959.186860-1-elver@google.com > > > > > > Marco Elver (9): > > > kcsan: Add Kernel Concurrency Sanitizer infrastructure > > > kcsan: Add Documentation entry in dev-tools > > > objtool, kcsan: Add KCSAN runtime functions to whitelist > > > build, kcsan: Add KCSAN build exceptions > > > seqlock, kcsan: Add annotations for KCSAN > > > seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier > > > asm-generic, kcsan: Add KCSAN instrumentation for bitops > > > locking/atomics, kcsan: Add KCSAN instrumentation > > > x86, kcsan: Enable KCSAN for x86 > > > > > > Documentation/dev-tools/index.rst | 1 + > > > Documentation/dev-tools/kcsan.rst | 217 +++++++++ > > > MAINTAINERS | 11 + > > > Makefile | 3 +- > > > arch/x86/Kconfig | 1 + > > > arch/x86/boot/Makefile | 2 + > > > arch/x86/boot/compressed/Makefile | 2 + > > > arch/x86/entry/vdso/Makefile | 3 + > > > arch/x86/include/asm/bitops.h | 6 +- > > > arch/x86/kernel/Makefile | 7 + > > > arch/x86/kernel/cpu/Makefile | 3 + > > > arch/x86/lib/Makefile | 4 + > > > arch/x86/mm/Makefile | 3 + > > > arch/x86/purgatory/Makefile | 2 + > > > arch/x86/realmode/Makefile | 3 + > > > arch/x86/realmode/rm/Makefile | 3 + > > > drivers/firmware/efi/libstub/Makefile | 2 + > > > include/asm-generic/atomic-instrumented.h | 393 +++++++-------- > > > include/asm-generic/bitops-instrumented.h | 18 + > > > include/linux/compiler-clang.h | 9 + > > > include/linux/compiler-gcc.h | 7 + > > > include/linux/compiler.h | 35 +- > > > include/linux/kcsan-checks.h | 97 ++++ > > > include/linux/kcsan.h | 115 +++++ > > > include/linux/sched.h | 4 + > > > include/linux/seqlock.h | 51 +- > > > init/init_task.c | 8 + > > > init/main.c | 2 + > > > kernel/Makefile | 6 + > > > kernel/kcsan/Makefile | 11 + > > > kernel/kcsan/atomic.h | 27 ++ > > > kernel/kcsan/core.c | 560 ++++++++++++++++++++++ > > > kernel/kcsan/debugfs.c | 275 +++++++++++ > > > kernel/kcsan/encoding.h | 94 ++++ > > > kernel/kcsan/kcsan.h | 131 +++++ > > > kernel/kcsan/report.c | 306 ++++++++++++ > > > kernel/kcsan/test.c | 121 +++++ > > > kernel/sched/Makefile | 6 + > > > lib/Kconfig.debug | 2 + > > > lib/Kconfig.kcsan | 119 +++++ > > > lib/Makefile | 3 + > > > mm/Makefile | 8 + > > > scripts/Makefile.kcsan | 6 + > > > scripts/Makefile.lib | 10 + > > > scripts/atomic/gen-atomic-instrumented.sh | 17 +- > > > tools/objtool/check.c | 18 + > > > 46 files changed, 2526 insertions(+), 206 deletions(-) > > > create mode 100644 Documentation/dev-tools/kcsan.rst > > > create mode 100644 include/linux/kcsan-checks.h > > > create mode 100644 include/linux/kcsan.h > > > create mode 100644 kernel/kcsan/Makefile > > > create mode 100644 kernel/kcsan/atomic.h > > > create mode 100644 kernel/kcsan/core.c > > > create mode 100644 kernel/kcsan/debugfs.c > > > create mode 100644 kernel/kcsan/encoding.h > > > create mode 100644 kernel/kcsan/kcsan.h > > > create mode 100644 kernel/kcsan/report.c > > > create mode 100644 kernel/kcsan/test.c > > > create mode 100644 lib/Kconfig.kcsan > > > create mode 100644 scripts/Makefile.kcsan > > > > > > -- > > > 2.24.0.rc1.363.gb1bccd3e3d-goog > > > > > > > -- > > You received this message because you are subscribed to the Google Groups "kasan-dev" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@googlegroups.com. > > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20191104164717.GE20975%40paulmck-ThinkPad-P72. From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: [PATCH v3 0/9] Add Kernel Concurrency Sanitizer (KCSAN) Date: Mon, 4 Nov 2019 11:46:58 -0800 Message-ID: <20191104194658.GK20975@paulmck-ThinkPad-P72> References: <20191104142745.14722-1-elver@google.com> <20191104164717.GE20975@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Marco Elver Cc: LKMM Maintainers -- Akira Yokosawa , Alan Stern , Alexander Potapenko , Andrea Parri , Andrey Konovalov , Andy Lutomirski , Ard Biesheuvel , Arnd Bergmann , Boqun Feng , Borislav Petkov , Daniel Axtens , Daniel Lustig , Dave Hansen , David Howells , Dmitry Vyukov , "H. Peter Anvin" , Ingo Molnar , Jade Alglave , Joel Fernandes , Jonathan Corbet List-Id: linux-arch.vger.kernel.org On Mon, Nov 04, 2019 at 07:41:30PM +0100, Marco Elver wrote: > On Mon, 4 Nov 2019 at 17:47, Paul E. McKenney wrote: > > > > On Mon, Nov 04, 2019 at 03:27:36PM +0100, Marco Elver wrote: > > > This is the patch-series for the Kernel Concurrency Sanitizer (KCSAN). > > > KCSAN is a sampling watchpoint-based data-race detector. More details > > > are included in Documentation/dev-tools/kcsan.rst. This patch-series > > > only enables KCSAN for x86, but we expect adding support for other > > > architectures is relatively straightforward (we are aware of > > > experimental ARM64 and POWER support). > > > > > > To gather early feedback, we announced KCSAN back in September, and > > > have integrated the feedback where possible: > > > http://lkml.kernel.org/r/CANpmjNPJ_bHjfLZCAPV23AXFfiPiyXXqqu72n6TgWzb2Gnu1eA@mail.gmail.com > > > > > > We want to point out and acknowledge the work surrounding the LKMM, > > > including several articles that motivate why data-races are dangerous > > > [1, 2], justifying a data-race detector such as KCSAN. > > > [1] https://lwn.net/Articles/793253/ > > > [2] https://lwn.net/Articles/799218/ > > > > > > The current list of known upstream fixes for data-races found by KCSAN > > > can be found here: > > > https://github.com/google/ktsan/wiki/KCSAN#upstream-fixes-of-data-races-found-by-kcsan > > > > Making this more accessible to more people seems like a good thing. > > So, for the series: > > > > Acked-by: Paul E. McKenney > > Much appreciated. Thanks, Paul! > > Any suggestions which tree this could eventually land in? I would guess that Dmitry might have some suggestions. Thanx, Paul > Thanks, > -- Marco > > > > Changelog > > > --------- > > > v3: > > > * Major changes: > > > - Add microbenchmark. > > > - Add instruction watchpoint skip randomization. > > > - Refactor API and core runtime fast-path and slow-path. Compared to > > > the previous version, with a default config and benchmarked using the > > > added microbenchmark, this version is 3.8x faster. > > > - Make __tsan_unaligned __alias of generic accesses. > > > - Rename kcsan_{begin,end}_atomic -> > > > kcsan_{nestable,flat}_atomic_{begin,end} > > > - For filter list in debugfs.c use kmalloc+krealloc instead of > > > kvmalloc. > > > - Split Documentation into separate patch. > > > > > > v2: http://lkml.kernel.org/r/20191017141305.146193-1-elver@google.com > > > * Major changes: > > > - Replace kcsan_check_access(.., {true, false}) with > > > kcsan_check_{read,write}. > > > - Change atomic-instrumented.h to use __atomic_check_{read,write}. > > > - Use common struct kcsan_ctx in task_struct and for per-CPU interrupt > > > contexts. > > > > > > v1: http://lkml.kernel.org/r/20191016083959.186860-1-elver@google.com > > > > > > Marco Elver (9): > > > kcsan: Add Kernel Concurrency Sanitizer infrastructure > > > kcsan: Add Documentation entry in dev-tools > > > objtool, kcsan: Add KCSAN runtime functions to whitelist > > > build, kcsan: Add KCSAN build exceptions > > > seqlock, kcsan: Add annotations for KCSAN > > > seqlock: Require WRITE_ONCE surrounding raw_seqcount_barrier > > > asm-generic, kcsan: Add KCSAN instrumentation for bitops > > > locking/atomics, kcsan: Add KCSAN instrumentation > > > x86, kcsan: Enable KCSAN for x86 > > > > > > Documentation/dev-tools/index.rst | 1 + > > > Documentation/dev-tools/kcsan.rst | 217 +++++++++ > > > MAINTAINERS | 11 + > > > Makefile | 3 +- > > > arch/x86/Kconfig | 1 + > > > arch/x86/boot/Makefile | 2 + > > > arch/x86/boot/compressed/Makefile | 2 + > > > arch/x86/entry/vdso/Makefile | 3 + > > > arch/x86/include/asm/bitops.h | 6 +- > > > arch/x86/kernel/Makefile | 7 + > > > arch/x86/kernel/cpu/Makefile | 3 + > > > arch/x86/lib/Makefile | 4 + > > > arch/x86/mm/Makefile | 3 + > > > arch/x86/purgatory/Makefile | 2 + > > > arch/x86/realmode/Makefile | 3 + > > > arch/x86/realmode/rm/Makefile | 3 + > > > drivers/firmware/efi/libstub/Makefile | 2 + > > > include/asm-generic/atomic-instrumented.h | 393 +++++++-------- > > > include/asm-generic/bitops-instrumented.h | 18 + > > > include/linux/compiler-clang.h | 9 + > > > include/linux/compiler-gcc.h | 7 + > > > include/linux/compiler.h | 35 +- > > > include/linux/kcsan-checks.h | 97 ++++ > > > include/linux/kcsan.h | 115 +++++ > > > include/linux/sched.h | 4 + > > > include/linux/seqlock.h | 51 +- > > > init/init_task.c | 8 + > > > init/main.c | 2 + > > > kernel/Makefile | 6 + > > > kernel/kcsan/Makefile | 11 + > > > kernel/kcsan/atomic.h | 27 ++ > > > kernel/kcsan/core.c | 560 ++++++++++++++++++++++ > > > kernel/kcsan/debugfs.c | 275 +++++++++++ > > > kernel/kcsan/encoding.h | 94 ++++ > > > kernel/kcsan/kcsan.h | 131 +++++ > > > kernel/kcsan/report.c | 306 ++++++++++++ > > > kernel/kcsan/test.c | 121 +++++ > > > kernel/sched/Makefile | 6 + > > > lib/Kconfig.debug | 2 + > > > lib/Kconfig.kcsan | 119 +++++ > > > lib/Makefile | 3 + > > > mm/Makefile | 8 + > > > scripts/Makefile.kcsan | 6 + > > > scripts/Makefile.lib | 10 + > > > scripts/atomic/gen-atomic-instrumented.sh | 17 +- > > > tools/objtool/check.c | 18 + > > > 46 files changed, 2526 insertions(+), 206 deletions(-) > > > create mode 100644 Documentation/dev-tools/kcsan.rst > > > create mode 100644 include/linux/kcsan-checks.h > > > create mode 100644 include/linux/kcsan.h > > > create mode 100644 kernel/kcsan/Makefile > > > create mode 100644 kernel/kcsan/atomic.h > > > create mode 100644 kernel/kcsan/core.c > > > create mode 100644 kernel/kcsan/debugfs.c > > > create mode 100644 kernel/kcsan/encoding.h > > > create mode 100644 kernel/kcsan/kcsan.h > > > create mode 100644 kernel/kcsan/report.c > > > create mode 100644 kernel/kcsan/test.c > > > create mode 100644 lib/Kconfig.kcsan > > > create mode 100644 scripts/Makefile.kcsan > > > > > > -- > > > 2.24.0.rc1.363.gb1bccd3e3d-goog > > > > > > > -- > > You received this message because you are subscribed to the Google Groups "kasan-dev" group. > > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@googlegroups.com. > > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20191104164717.GE20975%40paulmck-ThinkPad-P72.