[FS#804] mt7621: kernel errors - rcu_sched detected stalls on CPUs/tasks

[LEDE Bugs]

The following task has a new comment added:

FS#804 - mt7621: kernel errors - rcu_sched detected stalls on CPUs/tasks
User who did this - Baptiste Jonglez (bjonglez)

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You need to test the commit from john's staging tree before it gets merged into trunk.

By the way, ramips has been switched to linux 4.9, so it can also be worth testing the latest trunk image to see if it changes anything.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=804#comment2937