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"hung tasks" are bugs that cause the kernel to leave a task stuck in uninterruptible "D" state. A task/process in that state cannot be killed, neither with kill -9. Your message in /var/log/messages means that the task 4123, obviously the mysql daemon is in that state since 120 seconds. That means the mysql daemon waits for ressources. Mostly the "D" state ...


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you can pipe the output of ps and sort the column of memory depending on the requirement. ps aux | sort -r -k4


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echo 0 > /proc/sys/kernel/hung_task_timeout_secs only silences the warning. Besides that it has no effect whatsoever. Any value above zero will cause this message to be issued whenever a task is blocked for that amount of time. The warning is given to indicate a problem with the system. In my experience it means that the process is blocked in kernel ...



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