title: what's the meaning of error number in /var/log/messages?
body: <p>the context in /var/log/messages is:</p>
  
  <pre><code>ep 24 16:51:35 12006745D kernel: gdns_processor[5978]: segfault at ffffffffffffffe9 rip 0000003a3349d302 rsp 00000000536044e0 error 4
  Sep 24 18:38:34 12006745D kernel: gdns_processor[20452]: segfault at ffffffffffffffe8 rip 0000003a3349d302 rsp 0000000052e834e0 error 4
  Sep 25 14:58:01 12006745D auditd[3955]: Audit daemon rotating log files
  Sep 25 15:18:50 12006745D yum: Installed: 2:vim-common-7.0.109-7.el5.x86_64
  Sep 25 15:18:51 12006745D yum: Installed: 2:vim-enhanced-7.0.109-7.el5.x86_64
  Sep 25 15:18:52 12006745D yum: Installed: 2:vim-X11-7.0.109-7.el5.x86_64
  Sep 25 15:25:10 12006745D kernel: a.out[1694]: segfault at 0000000000000000 rip 0000000000400458 rsp 00007fffe69073a0 error 6
  Sep 25 15:29:33 12006745D kernel: a.out[8132]: segfault at 0000000000000000 rip 0000000000400458 rsp 00007fffa01fbb50 error 6
  Sep 25 17:57:29 12006745D kernel: gdns_processor[11504]: segfault at 0000000000594598 rip 0000003a3349d338 rsp 0000000052caf4e0 error 7
  Sep 25 18:08:05 12006745D kernel: t1[28050]: segfault at 0000000000000000 rip 0000000000400458 rsp 00007fff5ecb0850 error 6
  </code></pre>
  
  <p>What's the meaning of <strong>4</strong> in "<code>Sep 24 18:38:34 12006745D kernel: gdns_processor[20452]: segfault at ffffffffffffffe8 rip 0000003a3349d302 rsp 0000000052e834e0 error 4"</code>?<br></p>
  
  <p>also the same question about <strong>6</strong> and <strong>7</strong>. <br></p>
  
  <p>Thank you</p>