1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s 2 #include "test.h" 3 #include <sys/mman.h> 4 5 // Test for previously unbounded memory consumption for large mallocs. 6 // Code allocates a large memory block (that is handled by LargeMmapAllocator), 7 // and forces allocation of meta shadow for the block. Then freed the block. 8 // But meta shadow was not unmapped. Then code occupies the virtual memory 9 // range of the block with something else (that does not need meta shadow). 10 // And repeats. As the result meta shadow growed infinitely. 11 // This program used to consume >2GB. Now it consumes <50MB. 12 13 int main() { 14 for (int i = 0; i < 1000; i++) { 15 const int kSize = 1 << 20; 16 const int kPageSize = 4 << 10; 17 volatile int *p = new int[kSize]; 18 for (int j = 0; j < kSize; j += kPageSize / sizeof(*p)) 19 __atomic_store_n(&p[i], 1, __ATOMIC_RELEASE); 20 delete[] p; 21 mmap(0, kSize * sizeof(*p) + kPageSize, PROT_NONE, MAP_PRIVATE | MAP_ANON, 22 -1, 0); 23 } 24 fprintf(stderr, "DONE\n"); 25 return 0; 26 } 27 28 // CHECK: DONE 29
