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torvalds/linux//kernel/hung_task.c :

static void check_hung_task(struct task_struct *t, unsigned long timeout) https://github.com/torvalds/linux/blob/9f16d5e6f220661f73b36...

static void check_hung_uninterruptible_tasks(unsigned long timeout) https://github.com/torvalds/linux/blob/9f16d5e6f220661f73b36...

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Just to double check my understanding (because being wrong on the internet is perhaps the fastest way to get people to check your work):

Is this saying that regular tasks that haven't been scheduled for two minutes and tasks that are uninterruptible (truly so, not idle or also killable despite being marked as uninterruptible) that haven't been woken up for two minutes are counted?

The comment in the code says two minutes but the time would actually seem to depend on a timeout given as a parameter.

Your and the Llama's explanations would make good comments for the source and/or the docs if true.

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