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The hung_task timer fired on a task, but there are much older blocked tasks - why didn't they trip hung_task timer?

Solution In Progress - Updated 2015-05-31T23:48:21+00:00 -

Issue

One process tripped hung_task since it was in D-state (uninterruptible sleep - 'UN') for longer than hung_task_timeout_secs. However, there were other processes blocked in the D-state for much longer time. Why didn't the oldest task trip the hung task timer?
System panics with Kernel panic - not syncing: hung_task: blocked tasks but the task listed is not the oldest task.
How does the hung_task timer decide which task to check?

Environment

Red Hat Enterprise Linux

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