Re: [PATCH v3 1/9] kcsan: Add Kernel Concurrency Sanitizer infrastructure

Marco Elver
2019-11-07T18:44:00Z

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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