forked from OSchip/llvm-project
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/* RUN: %clang_msan -m64 %s -o %t
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RUN: %clang_msan -m64 %s -DBUILD_SO -fPIC -o %t-so.so -shared
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RUN: not %t 2>&1 | FileCheck %s
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CHECK: MemorySanitizer: use-of-uninitialized-value
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This is an actual bug in msan/glibc integration,
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see https://sourceware.org/bugzilla/show_bug.cgi?id=16291
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*/
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#ifndef BUILD_SO
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#include <assert.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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typedef long *(* get_t)();
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get_t GetTls;
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void *Thread1(void *unused) {
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long uninitialized;
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long *x = GetTls();
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if (*x)
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fprintf(stderr, "bar\n");
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*x = uninitialized;
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fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
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return 0;
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}
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void *Thread2(void *unused) {
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long *x = GetTls();
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fprintf(stderr, "stack: %p dtls: %p\n", &x, x);
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if (*x)
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fprintf(stderr, "foo\n"); // False negative here.
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return 0;
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}
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int main(int argc, char *argv[]) {
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char path[4096];
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snprintf(path, sizeof(path), "%s-so.so", argv[0]);
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int i;
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void *handle = dlopen(path, RTLD_LAZY);
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if (!handle) fprintf(stderr, "%s\n", dlerror());
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assert(handle != 0);
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GetTls = (get_t)dlsym(handle, "GetTls");
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assert(dlerror() == 0);
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pthread_t t;
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pthread_create(&t, 0, Thread1, 0);
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pthread_join(t, 0);
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pthread_create(&t, 0, Thread2, 0);
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pthread_join(t, 0);
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return 0;
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}
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#else // BUILD_SO
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__thread long huge_thread_local_array[1 << 17];
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long *GetTls() {
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return &huge_thread_local_array[0];
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}
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#endif
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