title: i need to know analyze "core.xxxx" with gdb
body: <p>gdb /usr/sbin/httpd ./core
      (gdb) bt</p>
  
  <pre><code>#0  0x00002af748ff9265 in ?? ()
  #1  0x00002af748ffad10 in ?? ()
  #2  0x00007fff0a31e248 in ?? ()
  #3  0x00007fff0a317aa0 in ?? ()
  #4  0x00007fff0a317a10 in ?? ()
  #5  0x00007fff0a317ad0 in ?? ()
  #6  0x0000000200000000 in ?? ()
  </code></pre>
  
  <p>plase tell me how to.
  thank u.</p>