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Trick learned: echo w > /proc/sysrq-trigger to show a stack trace in dmesg for tasks in uninterruptible sleep state. This is helpful to learn what the process is blocking on.
A post by Julia Evan on ftrace - a feature in kernel to trace any kernel functions! trace-cmd is a command line tool that makes it easy to do so.
<blockquote>Explanation of everything you can see in htop/top on Linux</blockquote>