llvm-project

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// RUN: %clangxx_tsan -O1 %s -o %t && %run %t
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// Data race randomly triggered.
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// UNSUPPORTED: target={{.*netbsd.*}}
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// Make sure TSan doesn't deadlock on a file stream lock at program shutdown.
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// See https://github.com/google/sanitizers/issues/454
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// https://github.com/google/sanitizers/issues/1733
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// UNSUPPORTED: glibc-2.38
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#ifdef __FreeBSD__
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#define _WITH_GETLINE  // to declare getline()
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#endif
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#include <pthread.h>
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#include <stdio.h>
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#include <unistd.h>
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void *thread(void *unused) {
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  char *line = NULL;
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  size_t size;
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  int fd[2];
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  pipe(fd);
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  // Forge a non-standard stream to make sure it's not closed.
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  FILE *stream = fdopen(fd[0], "r");
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  while (1) {
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    volatile int res = getline(&line, &size, stream);
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    (void)res;
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  }
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  return NULL;
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}
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int main() {
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  pthread_t t;
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  pthread_attr_t a;
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  pthread_attr_init(&a);
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  pthread_attr_setdetachstate(&a, PTHREAD_CREATE_DETACHED);
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  pthread_create(&t, &a, thread, NULL);
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  pthread_attr_destroy(&a);
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  fprintf(stderr, "DONE\n");
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  return 0;
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  // ThreadSanitizer used to hang here because of a deadlock on a file stream.
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}
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// CHECK: DONE
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