The 8th column of ps aux command will list the status of the process.

ps aux | awk '{if ($8 ~ "D") print $0}'

Here is a list of the various process statuses and what they mean:

D – Uninterruptible sleep (usually a critical system process, a process that cannot be killed without rebooting)
R – Running
S – Interruptible sleep (waiting for an event to complete)
T – Stopped
Z – Defunct (“zombie”) process