[cfe-users] Code locations from the Memory Sanitizer

[Rainer Gerhards via cfe-users]

2017-04-28 12:25 GMT+02:00 Erik de Castro Lopo via cfe-users
<cfe-users at lists.llvm.org>:
> Hi all,
>
> I've tried Clang versions 3.6, 3.9 and 5.0 (all installed from Debian
> packages on a Debian x86_64 machine), but I still can't get Memory
> Sanitizer to give me the error file and line number locations.
>
> The project is
>
>    http://github.com/erikd/libsndfile
>
> and I'm configuring/building it with eg:
>
>     CC=clang-5.0
>     CXX=clang++-5.0
>     CFLAGS="-fsanitize=memory -fno-omit-frame-pointer -g -Wno-expansion-to-defined"
>     CXXFLAGS=$CFLAGS
>     ./configure --enable-werror --disable-shared
>     make clean all check
>
> and I get:
>
>     broadcast_test                 : broadcast.rf64 ..........
>     Uninitialized bytes in __interceptor_write at offset 36 inside [0x710000000000, 104)
>     ==15113==WARNING: MemorySanitizer: use-of-uninitialized-value
>     #0 0x67802e  (/home/erik/Git/libsndfile/tests/command_test+0x67802e)
>     #1 0x600404  (/home/erik/Git/libsndfile/tests/command_test+0x600404)
>     #2 0x5f72f6  (/home/erik/Git/libsndfile/tests/command_test+0x5f72f6)
>     #3 0x4be48b  (/home/erik/Git/libsndfile/tests/command_test+0x4be48b)
>     #4 0x4c06d6  (/home/erik/Git/libsndfile/tests/command_test+0x4c06d6)
>     #5 0x4b1cfc  (/home/erik/Git/libsndfile/tests/command_test+0x4b1cfc)
>     #6 0x4a10c6  (/home/erik/Git/libsndfile/tests/command_test+0x4a10c6)
>     #7 0x495dbf  (/home/erik/Git/libsndfile/tests/command_test+0x495dbf)
>     #8 0x7f3f37cf22b0  (/lib/x86_64-linux-gnu/libc.so.6+0x202b0)
>     #9 0x41ef79  (/home/erik/Git/libsndfile/tests/command_test+0x41ef79)
>
> I expected to get file and line number position as shown in the documentation.
>
> Clues?

I often need to set the ASAN_SYMBOLIZER_PATH:

https://clang.llvm.org/docs/AddressSanitizer.html#id4

It often tends to be wrong by package default...

HTH
Rainer

>
> Erik
> --
> ----------------------------------------------------------------------
> Erik de Castro Lopo
> http://www.mega-nerd.com/
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