If someone has a way to reliably reproduce the 'Packet0 not allowed!' error,
please file a separate report for that. Or, if you know at least which process
triggers it, you can run that process with the environment variable
RADEON_DUMP_CS=1, and it should print a dump of the failed command stream(s) on
stderr.

P.S. I'm afraid this report has turned into a train wreck, it's impossible to
keep track of who encountered what issue(s) under what circumstances.