1 // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 3 // Test that mmap does not return unexpected addresses 4 // (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 15 int 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: DONE 36