title: /tmp mounted with only 1MB space, 100% used, as filesystem "overflow"
body: <p>For some reason, my <code>/tmp</code> is said to be 100% used.</p>
  
  <pre><code>root$ df 
  Filesystem         1K-blocks        Used  Available Use% Mounted on
  overflow                1024        1024          0 100% /tmp
  ... other stuff ...
  </code></pre>
  
  <p>Output of running <code>df -h</code></p>
  
  <pre><code>$ df -h
  Filesystem        Size  Used Avail Use% Mounted on
  /dev/sda1         102G   72G   25G  75% /
  none              4.0K     0  4.0K   0% /sys/fs/cgroup
  udev              7.8G  4.0K  7.8G   1% /dev
  tmpfs             1.6G  844K  1.6G   1% /run
  none              5.0M     0  5.0M   0% /run/lock
  none              7.8G  240K  7.8G   1% /run/shm
  none              100M   16K  100M   1% /run/user
  overflow          1.0M  1.0M     0 100% /tmp
  </code></pre>
  
  <p>Is there any way to safely remove unused stuff in <code>/tmp</code>?</p>
  
  <p>Thanks</p>