| 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(addr: 0, len: kSize * sizeof(*p) + kPageSize, PROT_NONE, MAP_PRIVATE | MAP_ANON, |
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| 25 | fd: -1, offset: 0); |
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| 26 | } |
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| 27 | fprintf(stderr, format: "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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| 32 | |
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