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From:   Marco Elver <elver@google.com>
Date:   Mon, 4 Nov 2019 19:41:30 +0100
Message-ID: <CANpmjNOtR6NEsXGo=M1o26d8vUyF7gwj=gew+LAeE_D+qfbEmQ@mail.gmail.com>
Subject: Re: [PATCH v3 0/9] Add Kernel Concurrency Sanitizer (KCSAN)
To:     "Paul E. McKenney" <paulmck@kernel.org>
Cc:     LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Alexander Potapenko <glider@google.com>,
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On Mon, 4 Nov 2019 at 17:47, Paul E. McKenney <paulmck@kernel.org> 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 <paulmck@kernel.org>

Much appreciated. Thanks, Paul!

Any suggestions which tree this could eventually land in?

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
> >
>
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