Corpus for fchmodat:
Coverage Program
4040 sendmsg$NL80211_CMD_TRIGGER_SCAN-syz_open_procfs-ioctl$BTRFS_IOC_GET_SUBVOL_INFO-perf_event_open-openat-fallocate-ioctl$EVIOCSMASK-openat-openat$cgroup_ro-ioctl$sock_SIOCGIFINDEX_80211-sendmsg$NL80211_CMD_DISCONNECT-lseek-openat-fchmodat-ioctl$sock_SIOCGIFINDEX_80211-sendfile-mmap
2910 syz_mount_image$tmpfs-lsetxattr$system_posix_acl-mknodat$loop-openat$dir-syz_io_uring_complete-getdents64-fchmodat-openat-openat$tcp_mem-fsetxattr$trusted_overlay_nlink-perf_event_open-perf_event_open
1546 syz_mount_image$ext4-seccomp$SECCOMP_SET_MODE_FILTER_LISTENER-fchmodat
252 perf_event_open-fchmodat