| 1 | // RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s |
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| 2 | |
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| 3 | // Test that mmap does not return unexpected addresses |
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| 4 | // (the check is in the interceptor). |
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| 5 | |
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| 6 | #include <fcntl.h> |
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| 7 | #include <stddef.h> |
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| 8 | #include <stdio.h> |
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| 9 | #include <stdlib.h> |
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| 10 | #include <sys/mman.h> |
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| 11 | #include <sys/stat.h> |
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| 12 | #include <sys/types.h> |
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| 13 | #include <unistd.h> |
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| 14 | |
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| 15 | int main() { |
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| 16 | int fd = open(file: "/dev/zero" , O_RDWR); |
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| 17 | if (fd == -1) perror(s: "open(/dev/zero)" ), exit(status: 1); |
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| 18 | for (size_t mmap_size = 64ull << 30; mmap_size >= 4 << 10; mmap_size /= 2) { |
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| 19 | size_t allocated = 0; |
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| 20 | while (mmap(addr: 0, len: mmap_size, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, |
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| 21 | fd: fd, offset: 0) != MAP_FAILED) { |
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| 22 | allocated += mmap_size; |
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| 23 | } |
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| 24 | fprintf(stderr, format: "allocated %zu with size %zu\n" , allocated, mmap_size); |
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| 25 | } |
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| 26 | fprintf(stderr, format: "DONE\n" ); |
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| 27 | // If tsan runtime will try to allocate something during exit handling, |
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| 28 | // the allocation will fail because there is no VA whatsoever. |
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| 29 | // It's observed to fail with the following error in some cases: |
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| 30 | // failed to allocate 0x1000 (4096) bytes of DTLS_NextBlock. |
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| 31 | // So terminate the process immediately. |
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| 32 | _exit(status: 0); |
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| 33 | } |
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| 34 | |
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| 35 | // CHECK: DONE |
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| 36 | |
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