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// RUN: %clangxx_tsan -O1 %s -DLIB -fPIC -fno-sanitize=thread -shared -o %T/libignore_lib1.so
// RUN: %clangxx_tsan -O1 %s -o %t
// RUN: echo running w/o suppressions:
// RUN: %deflake %run %t | FileCheck %s --check-prefix=CHECK-NOSUPP
// RUN: echo running with suppressions:
// RUN: %env_tsan_opts=suppressions='%s.supp' %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-WITHSUPP
// REQUIRES: stable-runtime
// Previously the test episodically failed with:
// ThreadSanitizer: called_from_lib suppression '/libignore_lib1.so$' is
// matched against 2 libraries: '/libignore_lib1.so' and '/libignore_lib1.so'
// This was caused by non-atomicity of reading of /proc/self/maps.
#ifndef LIB
#include <dlfcn.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <libgen.h>
#include <string>
#include "test.h"
#ifndef MAP_32BIT
# define MAP_32BIT 0
#endif
#ifdef __APPLE__
# define TSAN_MAP_ANON MAP_ANON
#else
# define TSAN_MAP_ANON MAP_ANONYMOUS
#endif
void *thr(void *arg) {
// This thread creates lots of separate mappings in /proc/self/maps before
// the ignored library.
for (int i = 0; i < 10000; i++) {
if (i == 5000)
barrier_wait(&barrier);
mmap(0, 4096, PROT_READ, TSAN_MAP_ANON | MAP_PRIVATE | MAP_32BIT, -1 , 0);
mmap(0, 4096, PROT_WRITE, TSAN_MAP_ANON | MAP_PRIVATE | MAP_32BIT, -1 , 0);
}
return 0;
}
int main(int argc, char **argv) {
barrier_init(&barrier, 2);
pthread_t th;
pthread_create(&th, 0, thr, 0);
barrier_wait(&barrier);
std::string lib = std::string(dirname(argv[0])) + "/libignore_lib1.so";
void *h = dlopen(lib.c_str(), RTLD_GLOBAL | RTLD_NOW);
if (h == 0)
exit(printf("failed to load the library (%d)\n", errno));
void (*f)() = (void(*)())dlsym(h, "libfunc");
if (f == 0)
exit(printf("failed to find the func (%d)\n", errno));
pthread_join(th, 0);
f();
}
#else // #ifdef LIB
#include "ignore_lib_lib.h"
#endif // #ifdef LIB
// CHECK-NOSUPP: WARNING: ThreadSanitizer: data race
// CHECK-NOSUPP: OK
// CHECK-WITHSUPP-NOT: WARNING: ThreadSanitizer: data race
// CHECK-WITHSUPP: OK
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