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CMD: wtm-17vm3 test -b ldiskfs
wtm-17vm3, /dev/lvm-Role_MDS/P1, /mnt/mds1, -o loop
CMD: wtm-17vm3 mount -t ldiskfs -o loop /dev/lvm-Role_MDS/P1 /mnt/mds1
wtm-17vm3: mount: could not find any free loop device
CMD: wtm-17vm3 mkdir /mnt/mds1/OBJECTS
CMD: wtm-17vm3 cp /usr/lib64/lustre/tests/admin_quotafile_v2.usr /mnt/mds1/OBJECTS
CMD: wtm-17vm3 cp /usr/lib64/lustre/tests/admin_quotafile_v2.grp /mnt/mds1/OBJECTS
CMD: wtm-17vm3 umount -f /mnt/mds1
wtm-17vm3: umount2: Invalid argument
wtm-17vm3: umount: /mnt/mds1: not mounted
It seems loop device is leaking, so this should be related with LU-4223.
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