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From:   Marco Elver <elver@google.com>
Date:   Thu, 7 Nov 2019 19:43:45 +0100
Message-ID: <CANpmjNNWeM91Jmoh8aujpBA9YVfL6LSqH-taQO-6BJQwUZfCkw@mail.gmail.com>
Subject: Re: [PATCH v3 1/9] kcsan: Add Kernel Concurrency Sanitizer infrastructure
To:     kbuild test robot <lkp@intel.com>
Cc:     kbuild-all@lists.01.org,
        LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Alexander Potapenko <glider@google.com>,
        Andrea Parri <parri.andrea@gmail.com>,
        Andrey Konovalov <andreyknvl@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Boqun Feng <boqun.feng@gmail.com>,
        Borislav Petkov <bp@alien8.de>, Daniel Axtens <dja@axtens.net>,
        Daniel Lustig <dlustig@nvidia.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        David Howells <dhowells@redhat.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
        Jade Alglave <j.alglave@ucl.ac.uk>,
        Joel Fernandes <joel@joelfernandes.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Luc Maranget <luc.maranget@inria.fr>,
        Mark Rutland <mark.rutland@arm.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        "Paul E. McKenney" <paulmck@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
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On Wed, 6 Nov 2019 at 21:35, kbuild test robot <lkp@intel.com> wrote:
>
> Hi Marco,
>
> I love your patch! Perhaps something to improve:
>
> [auto build test WARNING on linus/master]
> [also build test WARNING on v5.4-rc6]
> [cannot apply to next-20191106]
> [if your patch is applied to the wrong git tree, please drop us a note to help
> improve the system. BTW, we also suggest to use '--base' option to specify the
> base tree in git format-patch, please see https://stackoverflow.com/a/37406982]
>
> url:    https://github.com/0day-ci/linux/commits/Marco-Elver/Add-Kernel-Concurrency-Sanitizer-KCSAN/20191105-002542
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a99d8080aaf358d5d23581244e5da23b35e340b9
> config: x86_64-randconfig-a004-201944 (attached as .config)
> compiler: gcc-4.9 (Debian 4.9.2-10+deb8u1) 4.9.2
> reproduce:
>         # save the attached .config to linux build tree
>         make ARCH=x86_64
>
> If you fix the issue, kindly add following tag
> Reported-by: kbuild test robot <lkp@intel.com>

Thanks! Will send v4 with a fix.

> All warnings (new ones prefixed by >>):
>
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
> --
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    fs/afs/dynroot.c: In function 'afs_dynroot_lookup':
>    fs/afs/dynroot.c:117:6: warning: 'len' may be used uninitialized in this function [-Wmaybe-uninitialized]
>      ret = lookup_one_len(name, dentry->d_parent, len);
>          ^
>    fs/afs/dynroot.c:91:6: note: 'len' was declared here
>      int len;
>          ^
> --
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    7 real  2 user  5 sys  107.26% cpu   make modules_prepare
> --
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    In file included from include/linux/compiler_types.h:59:0,
>                     from <command-line>:0:
> >> include/linux/compiler_attributes.h:35:29: warning: "__GCC4_has_attribute___no_sanitize_thread__" is not defined [-Wundef]
>     # define __has_attribute(x) __GCC4_has_attribute_##x
>                                 ^
> >> include/linux/compiler-gcc.h:148:5: note: in expansion of macro '__has_attribute'
>     #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>         ^
>    8 real  24 user  10 sys  405.87% cpu         make prepare
>
> vim +/__has_attribute +148 include/linux/compiler-gcc.h
>
>    147
>  > 148  #if __has_attribute(__no_sanitize_thread__) && defined(__SANITIZE_THREAD__)
>    149  #define __no_sanitize_thread                                                   \
>    150          __attribute__((__noinline__)) __attribute__((no_sanitize_thread))
>    151  #else
>    152  #define __no_sanitize_thread
>    153  #endif
>    154
>
> ---
> 0-DAY kernel test infrastructure                 Open Source Technology Center
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org Intel Corporation
>
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