[FS#764] MT6721: Any traffic shaping results in crashes/stack traces

[LEDE Bugs]

The following task has a new comment added:

FS#764 - MT6721: Any traffic shaping results in crashes/stack traces
User who did this - Jaap Buurman (Mushoz)

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A compile of the latest master branch with the 4.9 kernels seems to have fixed the issue for me. Initial testing has shown no crashes whatsoever. I will monitor this over a longer period of time to see whether the issue is completely gone or not. Backporting some code from 4.9 to 4.4 might be needed to fix this issue once and for all.

Unfortunately, I am also running into a few new issues with the build with the 4.9 kernel. After a while, the router stops responding to a large number of commands in SSH sessions, and LUCI is also not able to apply changed settings (presumably because the restart command for the network is not working either). I am not sure if that is a widespread issue, or whether more people have the same issue.

I will keep this thread updated as more information comes in about the current situation. Hopefully more people will be able to join in on the testing.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=764#comment2609