skip-duplicates.log ( failed)

SKIP: tests/df/skip-duplicates
==============================

/
Filesystem     1K-blocks     Used Available Use% Mounted on
/dev/root       75085112 46687936  28380792  63% /
devtmpfs         8184112        0   8184112   0% /dev
tmpfs            8186904       84   8186820   1% /dev/shm
tmpfs            3274764     1104   3273660   1% /run
tmpfs               5120        0      5120   0% /run/lock
/dev/sda16        901520    59888    778504   8% /boot
/dev/sda15        106832     6246    100586   6% /boot/efi
/dev/sdb1       76829444  4194336  68686668   6% /mnt
tmpfs            1637380       12   1637368   1% /run/user/1001
skip-duplicates.sh: skipped test: internal test failure: maybe LD_PRELOAD doesn't work?
SKIP tests/df/skip-duplicates.sh (exit status: 77)