>> Without looking at the code, I suggest trying GCC's -sanitize=thread option and/or valgrind's helgrind tool. > > I wasn't able to get -fsanitize=thread to compile. I moved to a VM > with gcc 4.8+, installed libtsan0 (Trusty) and added the other flags > (-pie etc) but it kept complaining the __tsan functions were > undefined. Am I missing something to get this working? I seem to recall having to install libubsan and libasan for the Undefined Behavior and Address sanitizers (the ones I use). Maybe you need to install libtsan or similar? All you should need to do is add -fsanitize=thread to CFLAGS or CXXFLAGS. If you are linking through the compiler driver, then the CFLAGS or CXXFLAGS should be present with -fsanitize=thread, too. If you are linking directly through LD, then I think -fsanitize=thread needs to be provided in LDFLAGS. Jeff
