root@asuka:/var/log# grep '22581 blocked' kern.log.1
Jan  4 03:26:27 localhost kernel: [14156856.360891] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:28:27 localhost kernel: [14156976.360922] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:30:27 localhost kernel: [14157096.360894] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:32:27 localhost kernel: [14157216.360910] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:34:27 localhost kernel: [14157336.360901] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:36:27 localhost kernel: [14157456.360931] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:38:27 localhost kernel: [14157576.360919] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:40:27 localhost kernel: [14157696.360920] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:42:27 localhost kernel: [14157816.360988] INFO: task ls:22581 blocked for more than 120 seconds.
Jan  4 03:44:27 localhost kernel: [14157936.360917] INFO: task ls:22581 blocked for more than 120 seconds.
root@asuka:/var/log# ps xawu | grep 22581 | grep -v grep
jane     22581  0.0  0.1  20988   788 ?        D    Jan04   0:00 ls --color=auto -la
root@asuka:/var/log# kill -9 22581
root@asuka:/var/log# ps xawu | grep 22581 | grep -v grep
jane     22581  0.0  0.1  20988   788 ?        D    Jan04   0:00 ls --color=auto -la
root@asuka:/var/log# kill -HUP 1
root@asuka:/var/log# ps xawu | grep 22581 | grep -v grep
jane     22581  0.0  0.1  20988   788 ?        D    Jan04   0:00 ls --color=auto -la
root@asuka:/var/log# pstree 22581
ls