When a thread uses shared workqueue for a long time it my block
other tasks and in log you may see mesages like this :
INFO: task sshd:6425 blocked for more than 120 seconds.
Not tainted 2.6.32-431.11.2.el6.x86_64 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
sshd D 000000000000000e 0 6425 6418 0x00000080
...
In this case the time resources consuming work in hpsa
was found guilty and the first patch in series handles it.
Special thanks for the analysis to Herton R. Krzesinski
Tomas
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