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Well here's the problem, gcc got too smart and optimized out the stack 
buffer.

int
main (int argc, char **argv)
{
   4074c0:       56                      push   %rsi
   4074c1:       53                      push   %rbx
   4074c2:       48 83 ec 28             sub    $0x28,%rsp
   4074c6:       89 cb                   mov    %ecx,%ebx
   4074c8:       48 89 d6                mov    %rdx,%rsi
   4074cb:       e8 e0 d9 ff ff          callq  404eb0 <__main>
      reliably.  This problem has been noticed under AllocationPreference
      registry setting to 0x100000 (TOP_DOWN). */
   char buf[CYGTLS_PADSIZE];

   memset (buf, 0, sizeof (buf));
   exit (main2 (argc, argv));
   4074d0:       89 d9                   mov    %ebx,%ecx
   4074d2:       48 89 f2                mov    %rsi,%rdx
   4074d5:       e8 56 b0 ff ff          callq  402530 <_Z5main2iPPc>
   4074da:       89 c1                   mov    %eax,%ecx
   4074dc:       e8 57 fd ff ff          callq  407238 <exit>




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