Corpus for fchmodat:

Coverage	Program
4705	openat-close-openat-write-close-openat-write$binfmt_elf32-close-perf_event_open-fchmodat-execveat
1243	openat-fsetxattr$system_posix_acl-fchmodat
1097	syz_mount_image$ext4-perf_event_open-fchmodat
1018	seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-syz_mount_image$tmpfs-mknodat$loop-fchmodat
874	syz_mount_image$tmpfs-lsetxattr$system_posix_acl-mknodat$loop-openat$dir-fchmodat
570	syz_mount_image$tmpfs-perf_event_open-mknodat$loop-fchmodat
486	syz_open_procfs-fchmodat