Index: llvm/trunk/lib/Fuzzer/test/fuzzer-trace-pc.test
===================================================================
--- llvm/trunk/lib/Fuzzer/test/fuzzer-trace-pc.test
+++ llvm/trunk/lib/Fuzzer/test/fuzzer-trace-pc.test
@@ -1,3 +1,7 @@
 CHECK: BINGO
+REQUIRES: linux
 RUN: not LLVMFuzzer-FourIndependentBranchesTest-TracePC      -seed=1 -runs=1000000 2>&1 | FileCheck %s
+// FIXME: The test below uses a significant amount of memory on OSX and
+// sometimes hits the 2GiB memory limit. This needs to be investigated. For now
+// only run the test on Linux.
 RUN: not LLVMFuzzer-FullCoverageSetTest-TracePC              -seed=1 -runs=10000000 2>&1 | FileCheck %s