[asan] Restored asynch signal test.

llvm-svn: 253204

compiler-rt/test/asan/TestCases/Linux/halt_on_error-signals.c

@@ -0,0 +1,104 @@
+// Test interaction of Asan recovery mode with asynch signals.
+//
+// RUN: %clang_asan -fsanitize-recover=address -pthread %s -o %t
+//
+// RUN: rm -f %t.log
+// RUN: env ASAN_OPTIONS=halt_on_error=false %run %t 100 >%t.log 2>&1 || true
+// Collision will almost always get triggered but we still need to check the unlikely case:
+// RUN: FileCheck --check-prefix=CHECK-COLLISION %s < %t.log || FileCheck --check-prefix=CHECK-NO-COLLISION %s < %t.log
+//
+// REQUIRES: stable-runtime
+
+#define _SVID_SOURCE 1  // SA_NODEFER
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pthread.h>
+#include <time.h>
+#include <signal.h>
+
+#include <sanitizer/asan_interface.h>
+
+void random_delay(unsigned *seed) {
+  *seed = 1664525 * *seed + 1013904223;
+  struct timespec delay = { 0, (*seed % 1000) * 1000 };
+  nanosleep(&delay, 0);
+}
+
+volatile char bad[2] = {1, };
+
+void error() {
+  // CHECK-COLLISION: AddressSanitizer: nested bug in the same thread, aborting
+  // CHECK-NO-COLLISION: AddressSanitizer: use-after-poison
+  volatile int idx = 0;
+  bad[idx] = 0;
+}
+
+#define CHECK_CALL(e, msg) do {             \
+  if (0 != (e)) {                           \
+    fprintf(stderr, "Failed to " msg "\n"); \
+    exit(1);                                \
+  }                                         \
+} while (0)
+
+size_t niter = 10;
+pthread_t sender_tid, receiver_tid;
+
+pthread_mutex_t keep_alive_mu = PTHREAD_MUTEX_INITIALIZER;
+
+void *sender(void *arg) {
+  unsigned seed = 0;
+  for (size_t i = 0; i < niter; ++i) {
+    random_delay(&seed);
+    CHECK_CALL(pthread_kill(receiver_tid, SIGUSR1), "send signal");
+  }
+  return 0;
+}
+
+void handler(int sig) {
+  // Expect error collisions here
+  error();
+}
+
+void *receiver(void *arg) {
+  unsigned seed = 1;
+  for (size_t i = 0; i < niter; ++i) {
+    random_delay(&seed);
+    // And here
+    error();
+  }
+  // Parent will release this when it's ok to terminate
+  CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "unlock mutex");
+  return 0;
+}
+
+int main(int argc, char **argv) {
+  if (argc != 2) {
+    fprintf(stderr, "Syntax: %s niter\n", argv[0]);
+    exit(1);
+  }
+
+  niter = (size_t)strtoul(argv[1], 0, 0);
+
+  struct sigaction sa;
+  memset(&sa, 0, sizeof(sa));
+  sa.sa_handler = handler;
+  sa.sa_flags = SA_NODEFER; // Enable nested handlers to add more stress
+  CHECK_CALL(sigaction(SIGUSR1, &sa, 0), "set sighandler");
+
+  __asan_poison_memory_region(&bad, sizeof(bad));
+
+  CHECK_CALL(pthread_mutex_lock(&keep_alive_mu), "lock mutex");
+  CHECK_CALL(pthread_create(&receiver_tid, 0, receiver, 0), "start thread");
+  CHECK_CALL(pthread_create(&sender_tid, 0, sender, 0), "start thread");
+  CHECK_CALL(pthread_join(sender_tid, 0), "join thread");
+  // Now allow receiver to die
+  CHECK_CALL(pthread_mutex_unlock(&keep_alive_mu), "unlock mutex");
+  CHECK_CALL(pthread_join(receiver_tid, 0), "join thread");
+
+  // CHECK-NO-COLLISION: All threads terminated
+  printf("All threads terminated\n");
+
+  return 0;
+}