Corpus for fcntl$dupfd:

Coverage	Program
1141	openat-sendfile-creat-perf_event_open-syz_open_dev$sg-write$binfmt_elf64-timer_create-timer_settime-syz_open_dev$vcsu-syz_io_uring_setup-syz_open_dev$mouse-ioctl$SG_IO-setsockopt$inet6_int-socket$inet6_udplite-socket$netlink-sendmsg$nl_generic-fcntl$dupfd-io_submit-ioctl$BTRFS_IOC_SCRUB
112	openat$rfkill-fcntl$dupfd
112	perf_event_open-fcntl$lock-socket$inet6_udp-syz_open_procfs-renameat-mmap$perf-setsockopt$inet6_udp_int-connect$inet6-sendmsg$inet-socket$inet6_udplite-connect$inet6-syz_open_procfs-fcntl$dupfd-openat$hwrng-ioctl$EXT4_IOC_GETSTATE-syz_io_uring_submit-ioctl$EVIOCSABS3F-sendmsg$inet6-ioctl$sock_ipv6_tunnel_SIOCADDPRL