<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/111166>111166</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [win/asan] windows_hook_rtl_allocators=1 breaks CreateProcess
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            platform:windows,
            compiler-rt:sanitizer
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          zmodem
      </td>
    </tr>
</table>

<pre>
    Reproducer courtesy of @danakj 

Consider:

```
#include <stdio.h>
#include <windows.h>

int main(int argc, char* argv[]) {
  STARTUPINFOA startup_info;
  ZeroMemory(&startup_info, sizeof(startup_info));
  startup_info.cb = sizeof(startup_info);

 PROCESS_INFORMATION process_info;
  ZeroMemory(&process_info, sizeof(process_info));

  if (CreateProcessA("C:\\Windows\\System32\\cmd.exe", NULL, NULL, NULL, FALSE, 0, NULL, NULL, &startup_info, &process_info)) {
    fprintf(stderr, "OK!\n");

    CloseHandle(process_info.hThread);
 WaitForSingleObject(process_info.hProcess, INFINITE);
 CloseHandle(process_info.hProcess);
  } else {
    fprintf(stderr, "FAILED! %d\n", (int)GetLastError());
    return 1;
 }
}
```

Building with ASan and running without any special flags, it works:

```
C:\src\llvm-project>build\bin\clang-cl -fsanitize=address \src\temp\a.cc

C:\src\llvm-project>a.exe
OK!
Microsoft Windows [Version 10.0.19045.4894]
(c) Microsoft Corporation. All rights reserved.
```

Setting `windows_hook_rtl_allocators` (introduced in c9fa99d066f0f615538e106880fdb9fb48f8e55b) causes it to fail:

```
C:\src\llvm-project>set ASAN_OPTIONS=windows_hook_rtl_allocators=1

C:\src\llvm-project>a.exe
FAILED! 87
```
</pre>
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