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> If 3.9 shipped with these issues (assuming these are not false positive), it would be interesting to 1) know why the sanitizers didn’t catch it, and 2) add valgrind to the release qualification process (CC Hans). Yes, I'd be interested to see some corroboration. Note that the issue here is pretty specific: it only happens during optimized compile using Clang-3.9. This is all I did:

...ompiling my copy of the LLVM trunk I noticed that the line "_passManager.add(llvm::createTailDuplicationPass());" in my code fails with the following assertion: Assertion failed: NormalCtor && "Cannot call createPass on PassInfo without default ctor!", file D:\Workspace\llvmtrunk\include\llvm/PassSupport.h, line 111 This behavior was introduced in revision 89904: Both, lib/CodeGen/tailDuplication.cpp and lib/Transforms/TailDuplication.cpp export a function with the signature llvm::createTailDuplicationPass(). In my case the linker picks the wrong one - the CodeGen version...