llvm-project

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// RUN: %clang_tsan -O1 %s -o %t
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// RUN: %deflake %run %t | FileCheck %s --check-prefix=CHECK-NOZUPP
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// RUN: %env_tsan_opts=suppressions='%s.supp':print_suppressions=1 %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-SUPP
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#include "test.h"
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int *mem;
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pthread_mutex_t mtx;
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void *Thread1(void *x) {
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  pthread_mutex_lock(&mtx);
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  free(mem);
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  pthread_mutex_unlock(&mtx);
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  barrier_wait(&barrier);
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  return NULL;
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}
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__attribute__((noinline)) void *Thread2(void *x) {
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  barrier_wait(&barrier);
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  pthread_mutex_lock(&mtx);
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  mem[0] = 42;
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  pthread_mutex_unlock(&mtx);
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  return NULL;
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}
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int main() {
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  barrier_init(&barrier, 2);
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  mem = (int*)malloc(100);
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  pthread_mutex_init(&mtx, 0);
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  pthread_t t;
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  pthread_create(&t, NULL, Thread1, NULL);
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  Thread2(0);
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  pthread_join(t, NULL);
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  pthread_mutex_destroy(&mtx);
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  return 0;
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}
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// CHECK-NOZUPP: WARNING: ThreadSanitizer: heap-use-after-free
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// CHECK-NOZUPP:   Write of size 4 at {{.*}} by main thread{{.*}}:
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// CHECK-NOZUPP:     #0 Thread2
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// CHECK-NOZUPP:     #1 main
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// CHECK-NOZUPP:   Previous write of size 8 at {{.*}} by thread T1{{.*}}:
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// CHECK-NOZUPP:     #0 free
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// CHECK-NOZUPP:     #{{(1|2)}} Thread1
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// CHECK-NOZUPP: SUMMARY: ThreadSanitizer: heap-use-after-free{{.*}}Thread2
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// CHECK-SUPP:   ThreadSanitizer: Matched 1 suppressions
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// CHECK-SUPP:    1 race:^Thread2$
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