I'm also seeing this in a unit test https://github.com/willowtreeapps/PinkyPromise/blob/4c78d842fafc267ce06de3e77b2c01afef5cfbb9/Tests/PinkyPromiseTests/PromiseTest.swift#L846FATAL: ThreadSanitizer CHECK failed: /BuildRoot/Library/Caches/com.apple.xbs/Sources/clang_compiler_rt/clang-1103.0.32.26/compiler-rt/lib/sanitizer_common/sanitizer_allocator.cc:166 "((kBlockMagic)) == ((((u64*)addr)[0]))" (0x6a6cb03abcebc041, 0x7b5000004000)
runnals
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It does seem that fixing the threading issue within the code being tested does prevent this check from failing.