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Created attachment 24245 [details]
When building Mono with the ThreadSanitizer's injected functions, `make` never completes; as soon as it gets to the part where Roslyn tries to build the dlls, the runtime gets stuck. The corresponding (captured) stack traces of all threads during such a jam can be found attached.
The following code reproduces this issue reliably:
$ git clean -xffd
$ ./autogen.sh --prefix=/usr/local CC=clang CFLAGS="-fsanitize=thread" LDFLAGS=-fsanitize=thread CXX=clang++
$ # wait until mscorlib.dll has been built successfully (sometimes even mscorlib.dll does not complete, however most of the times it does) ...
I suspect that TSan messes around with our signal handler in some way. For reference: https://github.com/llvm-mirror/compiler-rt/blob/f728f46988ea1fc5c921dfdf53eea02a1050f80e/lib/tsan/rtl/tsan_interceptors.cc#L1823