[clang] [compiler-rt] [rtsan] Enable RealtimeSanitizer for FreeBSD (PR #125389)

[Chris Apple via llvm-commits]

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@@ -864,11 +864,18 @@ INTERCEPTOR(void *, pvalloc, size_t size) {
 #define RTSAN_MAYBE_INTERCEPT_PVALLOC
 #endif
 
+#if !SANITIZER_FREEBSD
+// enabling this interception on freebsd leads to infinite recursion
+// on pthread lib initialization
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cjappl wrote:

Can you do something like use internal_mmap here if we are initializing? If you check out rtsan.cpp there are three initializing states. 

May save us from disabling this on freebsd.

https://github.com/llvm/llvm-project/pull/125389