diff --git a/compiler-rt/test/ubsan/TestCases/Misc/Linux/sigaction.cpp b/compiler-rt/test/ubsan/TestCases/Misc/Linux/sigaction.cpp
--- a/compiler-rt/test/ubsan/TestCases/Misc/Linux/sigaction.cpp
+++ b/compiler-rt/test/ubsan/TestCases/Misc/Linux/sigaction.cpp
@@ -2,6 +2,11 @@
 
 // Ensure ubsan runtime/interceptors are lazily initialized if called early.
 
+// The test seems to segfault on aarch64 with tsan:
+// https://lab.llvm.org/buildbot/#/builders/179/builds/6662
+// Reason unknown, needs debugging.
+// XFAIL: target=aarch64{{.*}}
+
 #include <assert.h>
 #include <signal.h>
 #include <stdio.h>