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150
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1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
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2
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3 // UNSUPPORTED: ios
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4
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5 #include "test.h"
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6 #include <sys/mman.h>
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7
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8 // Test for previously unbounded memory consumption for large mallocs.
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9 // Code allocates a large memory block (that is handled by LargeMmapAllocator),
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10 // and forces allocation of meta shadow for the block. Then freed the block.
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11 // But meta shadow was not unmapped. Then code occupies the virtual memory
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12 // range of the block with something else (that does not need meta shadow).
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13 // And repeats. As the result meta shadow growed infinitely.
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14 // This program used to consume >2GB. Now it consumes <50MB.
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15
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16 int main() {
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17 for (int i = 0; i < 1000; i++) {
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18 const int kSize = 1 << 20;
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19 const int kPageSize = 4 << 10;
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20 volatile int *p = new int[kSize];
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21 for (int j = 0; j < kSize; j += kPageSize / sizeof(*p))
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22 __atomic_store_n(&p[i], 1, __ATOMIC_RELEASE);
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23 delete[] p;
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24 mmap(0, kSize * sizeof(*p) + kPageSize, PROT_NONE, MAP_PRIVATE | MAP_ANON,
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25 -1, 0);
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26 }
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27 fprintf(stderr, "DONE\n");
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28 return 0;
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29 }
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30
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31 // CHECK: DONE
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