36 lines · cpp
1// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2 3// Test that mmap does not return unexpected addresses4// (the check is in the interceptor).5 6#include <fcntl.h>7#include <stddef.h>8#include <stdio.h>9#include <stdlib.h>10#include <sys/mman.h>11#include <sys/stat.h>12#include <sys/types.h>13#include <unistd.h>14 15int main() {16 int fd = open("/dev/zero", O_RDWR);17 if (fd == -1) perror("open(/dev/zero)"), exit(1);18 for (size_t mmap_size = 64ull << 30; mmap_size >= 4 << 10; mmap_size /= 2) {19 size_t allocated = 0;20 while (mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,21 fd, 0) != MAP_FAILED) {22 allocated += mmap_size;23 }24 fprintf(stderr, "allocated %zu with size %zu\n", allocated, mmap_size);25 }26 fprintf(stderr, "DONE\n");27 // If tsan runtime will try to allocate something during exit handling,28 // the allocation will fail because there is no VA whatsoever.29 // It's observed to fail with the following error in some cases:30 // failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock.31 // So terminate the process immediately.32 _exit(0);33}34 35// CHECK: DONE36