@related: Unix Mode Perm chroot

Weird bug, I can not explain :

addgroup --gid 95924 rzr ; adduser --uid 95924 --gid 95924 rzr

id rzr
# uid=95924(rzr) gid=95924(rzr) groups=95924(rzr)
su rzr -c 'touch rzr'
ls -l
# -rw-r--r-- 1 rzr  rzr  0 Nov 27 23:58 rzr

touch tmp
ls -l
# -rw-r--r-- 1 root root 0 Nov 27 23:59 tmp
chown rzr:rzr tmp
ls -l
# -rw-r--r-- 1 30388 30388 0 Nov 27 23:59 tmp

strace chown rzr:rzr tmp
# ...
# chown("tmp", 95924, 95924)              = 0
# ...