title: nginx: [alert] kill(57200, 1) failed (3: No such process)
body: <p>When I am executing this command:</p>
  
  <pre><code>./nginx -s reload
  </code></pre>
  
  <p>Throw error:</p>
  
  <pre><code>nginx: [alert] kill(57200, 1) failed (3: No such process)
  </code></pre>
  
  <p>when I open the nginx.pid file:</p>
  
  <pre><code>vim /usr/loca/nginx/logs/nginx.pid
  </code></pre>
  
  <p>the process id is:57200.But when I am checking nginx process,it does not have master process,the output is:</p>
  
  <pre><code>    [root@localhost logs]# ps -aux|grep nginx
  Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
  root      12191  0.0  0.0  28172  8956 ?        S    Aug29   3:54 nginx: worker process                        
  root      12192  0.0  0.0  28172  8960 ?        S    Aug29   3:53 nginx: worker process                        
  root      12193  0.0  0.0  28436  9272 ?        S    Aug29   3:46 nginx: worker process                        
  root      12194  0.0  0.0  28172  8948 ?        S    Aug29   3:55 nginx: worker process                        
  root      12195  0.0  0.0  28436  9156 ?        S    Aug29   3:56 nginx: worker process                        
  root      12196  0.0  0.0  28172  8944 ?        S    Aug29   3:49 nginx: worker process                        
  root      12197  0.0  0.0  28172  8988 ?        S    Aug29   3:58 nginx: worker process                        
  root      12198  0.0  0.0  27908  8740 ?        S    Aug29   3:42 nginx: worker process                        
  root      12199  0.0  0.0  27908  8744 ?        S    Aug29   3:39 nginx: worker process                        
  root      53760  0.0  0.0 103252   832 pts/1    S+   22:14   0:00 grep nginx
  root      80835  0.0  0.0  27908  8740 ?        S    Aug31   2:30 nginx: worker process
  </code></pre>
  
  <p>What's wrong? How to solve this problem? The nginx version is 1.10.2.</p>