tsan: fix deadlock detector table (OK to lock sync var mutex during reporting)

llvm-svn: 180782

compiler-rt/lib/tsan/lit_tests/mutexset8.cc

@@ -0,0 +1,39 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+
+int Global;
+pthread_mutex_t *mtx;
+
+void *Thread1(void *x) {
+  sleep(1);
+  pthread_mutex_lock(mtx);
+  Global++;
+  pthread_mutex_unlock(mtx);
+  return NULL;
+}
+
+void *Thread2(void *x) {
+  Global--;
+  return NULL;
+}
+
+int main() {
+  // CHECK: WARNING: ThreadSanitizer: data race
+  // CHECK:   Write of size 4 at {{.*}} by thread T1
+  // CHECK:                         (mutexes: write [[M1:M[0-9]+]]):
+  // CHECK:   Previous write of size 4 at {{.*}} by thread T2:
+  // CHECK:   Mutex [[M1]] created at:
+  // CHECK:     #0 pthread_mutex_init
+  // CHECK:     #1 main {{.*}}/mutexset8.cc
+  mtx = new pthread_mutex_t;
+  pthread_mutex_init(mtx, 0);
+  pthread_t t[2];
+  pthread_create(&t[0], NULL, Thread1, NULL);
+  pthread_create(&t[1], NULL, Thread2, NULL);
+  pthread_join(t[0], NULL);
+  pthread_join(t[1], NULL);
+  pthread_mutex_destroy(mtx);
+  delete mtx;
+}

compiler-rt/lib/tsan/rtl/tsan_mutex.cc

@@ -31,8 +31,8 @@ static MutexType CanLockTab[MutexTypeCount][MutexTypeCount] = {
   /*0  MutexTypeInvalid*/     {},
   /*1  MutexTypeTrace*/       {MutexTypeLeaf},
   /*2  MutexTypeThreads*/     {MutexTypeReport},
-  /*3  MutexTypeReport*/      {MutexTypeSyncTab, MutexTypeMBlock,
+  /*3  MutexTypeReport*/      {MutexTypeSyncTab, MutexTypeSyncVar,
-                               MutexTypeJavaMBlock},
+                               MutexTypeMBlock, MutexTypeJavaMBlock},
   /*4  MutexTypeSyncVar*/     {},
   /*5  MutexTypeSyncTab*/     {MutexTypeSyncVar},
   /*6  MutexTypeSlab*/        {MutexTypeLeaf},