[cfe-users] Clang memory sanitizer: llvm-symbolizer problem

[Alexey Samsonov via cfe-users]

On Tue, Nov 24, 2015 at 9:12 AM, Schlottke-Lakemper, Michael via cfe-users <
cfe-users at lists.llvm.org> wrote:

> Short update: I thought the behavior reported below it might be related to
> the fact that llvm-symbolizer picks up the “wrong” (i.e. the
> msan-implemented) version of libc++ once I put it in the LD_LIBRARY_PATH.
>

Yes, I think that's what happening.


> Thus I tried to compile a complete LLVM/Clang stack (with compiler-rt,
> libcxx, libcxxabi, libomp) using -DLLVM_USE_SANITIZER=MemoryWithOrigins.
> However, this did not work either, as apparently during the compilation
> process the memory sanitizer already comes to life and complains about
> use-of-unitialized values… Thus this approach seems to be a dead end.
>
> Michael
>
> On 24 Nov 2015, at 15:28 , Michael Schlottke-Lakemper <
> m.schlottke-lakemper at aia.rwth-aachen.de> wrote:
>
> Hi folks,
>
> When running our msan-instrumented simulation program, instead of a proper
> output I get the following error:
>
> ==12089==WARNING: MemorySanitizer: use-of-uninitialized-value
> ==12089==WARNING: Can't read from symbolizer at fd 14
> /pds/opt/llvm/bin/llvm-symbolizer: symbol lookup error:
> /pds/opt/libcxx-20151121-r253770-clang-msan/lib/libc++abi.so.1: undefined
> symbol: __msan_origin_tls
> ==12089==WARNING: external symbolizer didn't start up correctly!
>
> My setup for using the memory sanitizer is as follows:
> - compile libc++/libc++abi with -fsanitize=memory
> - compile test program with normal (=uninstrumented) LLVM/Clang
> installation using -fsanitize=memory
> - put instrumented libcxx/libcxxabi library dirs into LD_LIBRARY_PATH
>
> Can you pass -Wl,-rpath when you link your executable, to specify the path
to instrumented libc++/libc++abi?


> - run program
>
> Any idea what I am doing wrong? Thanks a lot in advance!
>
> Michael
>
>
>
> --
> Michael Schlottke-Lakemper
>
> Chair of Fluid Mechanics and Institute of Aerodynamics
> RWTH Aachen University
> Wüllnerstraße 5a
> 52062 Aachen
> Germany
>
> Phone: +49 (241) 80 95188
> Fax: +49 (241) 80 92257
> Mail: m.schlottke-lakemper at aia.rwth-aachen.de
> Web: http://www.aia.rwth-aachen.de
>
>
>
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>


-- 
Alexey Samsonov
vonosmas at gmail.com
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