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4b4eaf3b76
When two threads use `gnrc_ipv6_nib_get_next_hop_l2addr()` to determine a next hop (e.g. when there is both an IPv6 sender and a 6LoWPAN fragment forwarder), a race condition may happen, where one thread acquires the NIB and the other acquires the network interface resulting in a deadlock. By releasing the NIB (if acquired) before trying to acquire the network interface and re-acquiring the NIB after the network interface is acquired, this is fixed.