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