Workaround rare deadlock with ristreceiver

Workaround a rare "deadlock" where a ristreceiver keeps requesting so much NACKS that the link becomes flooded, resulting in lots of late packets, buffers being full and never recovering. Also fix a few segfaults, and lower loglevel of most per packet logs to DEBUG (saw 11 GB in 20min!!!)

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• 828160d2 - Workaround rare deadlock with ristreceiver

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