tsan: fix crash during __tsan_java_move

Munmap interceptor did not reset meta shadow for the range,
and __tsan_java_move crashed because it encountered
non-zero meta shadow for the destination.

llvm-svn: 232029

1 files changed, 28 insertions, 0 deletions

diff --git a/compiler-rt/test/tsan/java_heap_init.cc b/compiler-rt/test/tsan/java_heap_init.cc
new file mode 100644
index 00000000000..bb7357c25b4
--- /dev/null
+++ b/compiler-rt/test/tsan/java_heap_init.cc
@@ -0,0 +1,28 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+#include "java.h"
+#include <errno.h>
+#include <sys/mman.h>
+
+int main() {
+  // Test that munmap interceptor resets meta shadow for the memory range.
+  // Previously __tsan_java_move failed because it encountered non-zero meta
+  // shadow for the destination.
+  int const kHeapSize = 1024 * 1024;
+  jptr jheap = (jptr)mmap(0, kHeapSize, PROT_READ | PROT_WRITE,
+      MAP_ANON | MAP_PRIVATE, -1, 0);
+  if (jheap == (jptr)MAP_FAILED)
+    return printf("mmap failed with %d\n", errno);
+  __atomic_store_n((int*)jheap, 1, __ATOMIC_RELEASE);
+  munmap((void*)jheap, kHeapSize);
+  jheap = (jptr)mmap((void*)jheap, kHeapSize, PROT_READ | PROT_WRITE,
+      MAP_ANON | MAP_PRIVATE, -1, 0);
+  if (jheap == (jptr)MAP_FAILED)
+    return printf("second mmap failed with %d\n", errno);
+  __tsan_java_init(jheap, kHeapSize);
+  __tsan_java_move(jheap + 16, jheap, 16);
+  printf("DONE\n");
+  return __tsan_java_fini();
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer: data race
+// CHECK: DONE