Corpus for mknodat$loop:

Coverage	Program
1876	perf_event_open-mknodat$loop
1309	syz_mount_image$vfat-openat$incfs-mknodat$loop
1018	perf_event_open-syz_mount_image$tmpfs-mknodat$loop
987	syz_mount_image$tmpfs-mknodat$loop
513	syz_open_procfs-mknodat$loop
190	perf_event_open-socket$inet6_udp-setsockopt$inet6_udp_int-connect$inet6-openat$sr-syz_open_dev$loop-ioctl$LOOP_SET_FD-ioctl$PERF_EVENT_IOC_QUERY_BPF-sendmsg$inet-fcntl$dupfd-sendmsg$inet6-write-mknodat$loop-dup-syz_open_procfs-syz_open_procfs-syz_mount_image$ext4-syz_mount_image$tmpfs-mkdir