[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 - dchard (dchard)

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@john:

I am testing your fixes (in trunk) for 5 days, and so far there was no crash, warning, or any other indication of the problem. The kernel and system logs are also clean.

How I tested is the following:

1. Run openssl test to load all cores/threads to 100%:

openssl speed md5 sha1 sha256 sha512 des des-ede3 aes-128-cbc aes-192-cbc aes-256-cbc rsa2048 dsa2048 rsa4096 -multi 4

2. In the same time, start Iperf3 as server on the router, and run iperf3 tests on gigabit LAN in paralell with the openssl tests above. This is how I simulated high processor load and network traffic in the same time.

Previously it took only a few minutes to recreate the errors above, now it seems to be gone completely. I will look into to logs every few days to see if anything happens.

Thanks for your hard work!
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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#comment3171