relayOpaquePacket() allocates a copy and returns Router::send(relay) == ERRNO_OK, discarding ERRNO_SHOULD_RELEASE. The interface returns that for NODENUM_BROADCAST_NO_LORA, so the copy is never freed and one pool slot leaks per frame.
The opaque path is reached for packets on a channel we have no key for, so no key or PSK is needed: a frame with an unknown channel hash, to=NODENUM_BROADCAST_NO_LORA, a nonzero id and hop_limit>0 leaks a slot, and roughly MAX_PACKETS of them exhaust the pool until reboot.
#11087 fixed this pattern in perhapsRebroadcast and the retransmission paths but did not cover relayOpaquePacket, which was added separately with the opaque relay path.
cdd996248c