assuming the $LFS partition is mounted and the link /tools is right and basic stuff like that
not in chroot
readelf -l /tools/bin/env | grep interpreter
The response should read:
Requesting program interpreter: /tools/lib/ld-linux.so.2
If it doesn't, it means your glibc locking in stage didn't
get done correctly, and your software is still linking against stuff on
or you used a wrong patch or something and the path got messed up ??