Congestion while accessing /proc triggers hung task warnings.

Issue

• Our production box got hung and we have rebooted to bring it back online.
• Blocked tasks reported in the log:

crash> log | grep blocked
INFO: task TIBCO EMS Conne:28222 blocked for more than 120 seconds.
INFO: task splunkd:4206 blocked for more than 120 seconds.
INFO: task splunkd:4206 blocked for more than 120 seconds.
INFO: task splunkd:4206 blocked for more than 120 seconds.
INFO: task splunkd:4206 blocked for more than 120 seconds.
INFO: task splunkd:4206 blocked for more than 120 seconds.
INFO: task crond:3683 blocked for more than 120 seconds.
INFO: task crond:3713 blocked for more than 120 seconds.
INFO: task pdflush:497 blocked for more than 120 seconds.
INFO: task kjournald:856 blocked for more than 120 seconds.