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      1 // RUN: %clangxx_msan -O0 %s -o %t && %run %t
      2 
      3 #include <assert.h>
      4 #include <errno.h>
      5 #include <stdio.h>
      6 #include <unistd.h>
      7 
      8 int main()
      9 {
     10   int x;
     11   int *volatile p = &x;
     12   errno = *p;
     13   int res = read(-1, 0, 0);
     14   assert(res == -1);
     15   if (errno) printf("errno %d\n", errno);
     16   return 0;
     17 }
     18