Remove unnecessary REQUIRE in dns_resolver_attach

There is no harm in aquiring an additional reference to the resolver
after it has started shutting down.  All the REQUIRE was doing was
introducing a point of failure when shutting down the server.

diff --git a/lib/dns/resolver.c b/lib/dns/resolver.c
index f2c2e1caceb6691348819b5ebcb3f62a2291f521..b5a78ab52b4ccfd724539a0a82305f628fd52e5b 100644 (file)
--- a/lib/dns/resolver.c
+++ b/lib/dns/resolver.c
@@ -10616,7 +10616,6 @@ dns_resolver_attach(dns_resolver_t *source, dns_resolver_t **targetp) {
 
        RRTRACE(source, "attach");
 
-       REQUIRE(!atomic_load_acquire(&source->exiting));
        isc_refcount_increment(&source->references);
 
        *targetp = source;