Segfault

[robinweide]

Hi there,

I read your paper with great interest and would like to try your tool.

Using boost from Homebrew, I compiled your code per your instructions. However, I get a Segmentation fault 11 at different times, when changing the size of the matrix. Even very small matrices seem to cause a Segfault11.

Could you please help?

Thanks,

Robin

---

Specs:

• MacBook Pro (Retina, 13-inch, Late 2013)
• 2,8 GHz Intel Core i7
• 16 GB 1600 MHz DDR3

[laraib85]

Hi,

Thanks for your interest in the tool. Could you send me the file you're trying to run the tool on? I'll look into the issue.

[robinweide]

Awesome! I just used your example-matrix and sub-samples of it.

[rob-p]

@laraib85 --- such segfaults are usually the result of trying to access an array out of bounds somewhere (which has undefined behavior and thus makes reproducing things difficult). We might try adding -D _GLIBCXX_DEBUG to the compiler flags to turn on bounds checking for all vector accesses to see if that helps us catch it.

[laraib85]

@robinweide hey, try running it now. Fixed the bug, should be fine. Thanks!

[robinweide]

Tried installing it on my Mac with the following error (will try on my Ubuntu-desktop tomorrow):

[ 20%] Building CXX object src/CMakeFiles/matryoshka.dir/Matryoshka.cpp.o cd /Users/robin/bin/matryoshka-master/src && /Users/robin/bin/matryoshka-master/clang++ -O3 -g -std=c++11 -Wall -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -mmacosx-version-min=10.9 -I/Users/robin/boost/include -I/Users/robin/bin/matryoshka-master/include -o CMakeFiles/matryoshka.dir/Matryoshka.cpp.o -c /Users/robin/bin/matryoshka-master/src/Matryoshka.cpp /bin/sh: /Users/robin/bin/matryoshka-master/clang++: No such file or directory make[2]: * [src/CMakeFiles/matryoshka.dir/Matryoshka.cpp.o] Error 127 make[1]: * [src/CMakeFiles/matryoshka.dir/all] Error 2 make: *\ [all] Error 2

[laraib85]

I didn't make any changes to the make files so it should compile as before. It can't find clang. Make sure the program can access the correct folder where clang is installed.

[rob-p]

Yes; this looks like a failure to find the compiler. Strangely, it seems it's looking for it in the matryoshka directory! @robinweide --- can you post the output of the command $ clang++ -v, and also $ which clang++? I would recommend completely removing the build directory and trying to make again from scratch. This build compiles cleanly on my macbook pro with clang version Apple LLVM version 7.0.2 (clang-700.1.81).

[robinweide]

Got it to compile on my desktop with:

cmake -DMAKE_C_COMPILER=/usr/bin/clang -DMAKE_CXX_COMPILER=/usr/bin/clang++ -DBOOST_ROOT=$HOME/boost -DBOOST_NO_SYSTEM_PATHS=true

Thanks everybody! :+1: