Disable FlushSchedule when running TSAN

Summary:
There's a bug in TSAN (or libstdc++?) with std::shared_ptr<> for some reason. In db_test, only FlushSchedule is affected.

See more: https://groups.google.com/forum/#!topic/thread-sanitizer/vz_s-t226Vg

With this change and all other @sdong's and mine diffs, our db_test should be TSAN-clean. I'll move to other tests.

Test Plan: no more flush schedule when running TSAN

Reviewers: yhchiang, rven, sdong

Reviewed By: sdong

Subscribers: sdong, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D32469

Makefile

@@ -61,8 +61,8 @@ endif
 ifdef COMPILE_WITH_TSAN
 	DISABLE_JEMALLOC=1
 	EXEC_LDFLAGS += -fsanitize=thread -pie
-	PLATFORM_CCFLAGS += -fsanitize=thread -fPIC
-	PLATFORM_CXXFLAGS += -fsanitize=thread -fPIC
+	PLATFORM_CCFLAGS += -fsanitize=thread -fPIC -DROCKSDB_TSAN_RUN
+	PLATFORM_CXXFLAGS += -fsanitize=thread -fPIC -DROCKSDB_TSAN_RUN
 endif
 
 ifndef DISABLE_JEMALLOC

db/db_test.cc

@@ -3036,6 +3036,9 @@ TEST(DBTest, RecoverDuringMemtableCompaction) {
   } while (ChangeOptions());
 }
 
+// false positive TSAN report on shared_ptr --
+// https://groups.google.com/forum/#!topic/thread-sanitizer/vz_s-t226Vg
+#ifndef ROCKSDB_TSAN_RUN
 TEST(DBTest, FlushSchedule) {
   Options options = CurrentOptions();
   options.disable_auto_compactions = true;
@@ -3073,6 +3076,7 @@ TEST(DBTest, FlushSchedule) {
   ASSERT_LE(pikachu_tables, static_cast<uint64_t>(10));
   ASSERT_GT(pikachu_tables, static_cast<uint64_t>(0));
 }
+#endif  // enabled only if not TSAN run
 
 TEST(DBTest, MinorCompactionsHappen) {
   do {