Index: test/asan/TestCases/Linux/recvfrom.cc
===================================================================
--- test/asan/TestCases/Linux/recvfrom.cc
+++ test/asan/TestCases/Linux/recvfrom.cc
@@ -2,7 +2,6 @@
 //
 // RUN: %clangxx_asan %s -o %t && not %run %t 2>&1 | FileCheck %s
 //
-// REQUIRES: broken
 // UNSUPPORTED: android
 
 #include <stdio.h>
@@ -14,8 +13,9 @@
 #include <sys/socket.h>
 #include <pthread.h>
 
-const int kPortNum = 1234;
+int kPortNum = 1234;
 const int kBufSize = 10;
+pthread_mutex_t server_ready_mu = PTHREAD_MUTEX_INITIALIZER;
 
 static void *server_thread_udp(void *data) {
   char buf[kBufSize / 2];
@@ -29,9 +29,15 @@
   serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
   serveraddr.sin_port = htons(kPortNum);
 
-  if (bind(sockfd, (struct sockaddr *) &serveraddr, sizeof(serveraddr)) < 0)
-    fprintf(stderr, "ERROR on binding\n");
-
+  // In parallel test run we may already have acquired port 1234. Increase
+  // kPortNum until we found free port.
+  while (bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr)) < 0) {
+    ++kPortNum;
+    serveraddr.sin_port = htons(kPortNum);
+  }
+  // Release the mutex since the server is ready now and kPortNum has proper
+  // value.
+  pthread_mutex_unlock(&server_ready_mu);
   recvfrom(sockfd, buf, kBufSize, 0, NULL, NULL); // BOOM
   // CHECK: {{WRITE of size 9 at 0x.* thread T1}}
   // CHECK: {{    #1 0x.* in server_thread_udp.*recvfrom.cc:}}[[@LINE-2]]
@@ -66,6 +72,10 @@
   serveraddr.sin_family = AF_INET;
   memcpy((char *)&serveraddr.sin_addr.s_addr, (char *)server->h_addr,
           server->h_length);
+
+  // Wait until the server found free port and initialized kPortNum with proper
+  // value.
+  pthread_mutex_lock(&server_ready_mu);
   serveraddr.sin_port = htons(kPortNum);
   sendto(sockfd, buf, strlen(buf), 0, (struct sockaddr *) &serveraddr,
          sizeof(serveraddr));