[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 - camel (camel)

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meanwhile tested ... with default SQM it is OK
the SQM "cake" is not stable for me

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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#comment2736