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c4b9bc63e0
Sending the same query repeatedly to a dnsmasq instance which doesn't get replies from upstream will eventually hit the hard limit on frec_src structures and start gettin REFUSED replies. This is OK, except that since the queries are no longer being forwarded, an upstream server coming back doesn't reset the situation. If there is any other traffic, frec allocation will eventually delete the timed-out frec and get things moving again, but that's not guaranteed. To fix this we explicitly delete the frec once timed out in this case. Thanks to Filip Jenicek for noticing and characterising this problem.