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The termination condition implemented in gnrc_pktbuf_malloc does not work when using the sock interface as sock copies packet data to a local buffer and frees the packet afterwards. As such, the fuzzing application would exit before performing any input processing. For this reason, the termination condition in gnrc_pktbuf_malloc is disabled when using sock. Instead, the application terminates if gnrc_sock_recv previously returned the fuzzing packet. The underlying assumption of this implementation is that gnrc_sock_recv is called in a loop.