On Mon, 4 Nov 2019 at 17:47, Paul E. McKenney <paulmck@xxxxxxxxxx> 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@xxxxxxxxxxxxxx > > > > 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@xxxxxxxxxx> 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@xxxxxxxxxx > > * 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@xxxxxxxxxx > > > > 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@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/20191104164717.GE20975%40paulmck-ThinkPad-P72.
