It sounds like you're using all static routes here. Try using extended ping and trace from the routers, using the ethernet port's IP address as the source address. If you see "A" in an extended trace , it means that an Access-List is filtering out the packet. Trace will also help, the next hop after the last responding hop is the one that does know how to either get to the destination address or more likely return to the source address.
ICMP unrechables are sent by a router (except a few L3 switches) when a packet is denied by an ACL. In your case, it could be due to that. If you can paste the configs of ACL, we might be able to help!
Just to verify, it there is any routing problems, are you facing problems pinging other subnets in the 172.16.0.0 range ?
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