title: SIGSEGV, Segmentation fault with memcpy_avx_unaligned
body: <p>I am trying to copy 4 bytes form <strong>s</strong> to <strong>handler-&gt;data</strong> didn't understand the error.</p>
  <p>Tried to debug with gdb, but everything looks good.</p>
  <pre><code>memcpy(handler-&gt;data + handler-&gt;len, s-&gt;begin, num_bytes);   
  (gdb) p handler-&gt;data   
  $5 = (uint8_t *) 0x0   
  (gdb) p s-&gt;begin   
  $6 = (const uint8_t *) 0x7ffcfda705b2 &quot;D&quot;   
  (gdb) s  
  __memcpy_avx_unaligned () at ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S:41 41     
  ../sysdeps/x86_64/multiarch/memcpy-avx-unaligned.S: No such file or directory.
  </code></pre>