# LC_ALL=C mount /tmp/partition.img partition-mp -o loop -t auto
mount: system: mount failed: Unknown error -1
# modprobe loop
# LC_ALL=C mount /tmp/partition.img partition-mp -o loop -t auto
(OK)
# LC_ALL=C mount /tmp/partition.img partition-mp -o loop -t auto
mount: system: mount failed: Unknown error -1
# modprobe loop
# LC_ALL=C mount /tmp/partition.img partition-mp -o loop -t auto
(OK)