Corpus for write$tun:

Coverage	Program
4846	perf_event_open-gettid-process_vm_readv-perf_event_open-getpgrp-perf_event_open-perf_event_open-ioctl$sock_FIOGETOWN-creat-ftruncate-syz_open_dev$vcsu-write$tun
2248	creat-write$binfmt_elf64-ftruncate-write$tun
1340	syz_open_dev$sg-socket$inet6_udplite-fcntl$dupfd-write$tun
192	ioctl$TCSETSF2-openat$tun-ioctl$TUNSETQUEUE-write$tun