| /* RUN: %clang_msan -g %s -o %t |
| RUN: %clang_msan -g %s -DBUILD_SO -fPIC -o %t-so.so -shared |
| RUN: %run %t 2>&1 |
| |
| Regression test for a bug in msan/glibc integration, |
| see https://sourceware.org/bugzilla/show_bug.cgi?id=16291 |
| and https://github.com/google/sanitizers/issues/547 |
| |
| XFAIL: FreeBSD |
| UNSUPPORTED: powerpc |
| |
| // Reports use-of-uninitialized-value, not analyzed |
| XFAIL: netbsd |
| |
| // This is known to be broken with glibc-2.27+ |
| // https://bugs.llvm.org/show_bug.cgi?id=37804 |
| XFAIL: glibc-2.27 |
| |
| */ |
| |
| #ifndef BUILD_SO |
| #include <assert.h> |
| #include <dlfcn.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <pthread.h> |
| |
| typedef long *(* get_t)(); |
| get_t GetTls; |
| void *Thread1(void *unused) { |
| long uninitialized; |
| long *x = GetTls(); |
| if (*x) |
| fprintf(stderr, "bar\n"); |
| *x = uninitialized; |
| fprintf(stderr, "stack: %p dtls: %p\n", &x, x); |
| return 0; |
| } |
| |
| void *Thread2(void *unused) { |
| long *x = GetTls(); |
| fprintf(stderr, "stack: %p dtls: %p\n", &x, x); |
| if (*x) |
| fprintf(stderr, "foo\n"); // False negative here. |
| return 0; |
| } |
| |
| int main(int argc, char *argv[]) { |
| char path[4096]; |
| snprintf(path, sizeof(path), "%s-so.so", argv[0]); |
| int i; |
| |
| void *handle = dlopen(path, RTLD_LAZY); |
| if (!handle) fprintf(stderr, "%s\n", dlerror()); |
| assert(handle != 0); |
| GetTls = (get_t)dlsym(handle, "GetTls"); |
| assert(dlerror() == 0); |
| |
| pthread_t t; |
| pthread_create(&t, 0, Thread1, 0); |
| pthread_join(t, 0); |
| pthread_create(&t, 0, Thread2, 0); |
| pthread_join(t, 0); |
| return 0; |
| } |
| #else // BUILD_SO |
| __thread long huge_thread_local_array[1 << 17]; |
| long *GetTls() { |
| return &huge_thread_local_array[0]; |
| } |
| #endif |