See summary Example: find /bin -perm -4000 returns totally incorrect results Comments from Alan Cox: Agreed find /bin -perm 4711 works find /bin -perm +4000 works find /bin -perm -4000 breaks Comments from Jeremy Katz Confirmed. Looks like the findutils is pristine, so the bug probably needs to be filed with bug-findutils as well
resolved by beta3's findutils-4.1.5-3