[lvm-devel] pvmove + loop device eats data

[Killian De Volder]

Hello,

Today I needed some space, so I wiped up a disk, threw a file on it, and pmoved it.
Done my resizes, and moved the data back, only to see my data disappear.
(lv was filled with zero's).

The steps required to reproduce the problem are below?
Did I do something wrong, or did I stumble upon a bug ?

Kind regards,
Killian

# lvm version
LVM version:     2.02.88(2) (2011-08-19)
Library version: 1.02.67 (2011-08-19)
Driver version:  4.22.0

# dmsetup version
Library version:   1.02.67 (2011-08-19)
Driver version:    4.22.0

Kernel version: 3.2.1-gentoo-r2

#dd of=test_pv1 if=/dev/zero bs=1M seek=512 count=0
0+0 records in
0+0 records out
0 bytes (0 B) copied, 1,0151e-05 s, 0,0 kB/s
#dd of=test_pv2 if=/dev/zero bs=1M seek=512 count=0
0+0 records in
0+0 records out
0 bytes (0 B) copied, 1,0369e-05 s, 0,0 kB/s
#losetup /dev/loop0 test_pv1
#losetup /dev/loop1 test_pv2
#pvcreate /dev/loop0
File descriptor 6 (pipe:[839]) leaked on pvcreate invocation. Parent PID 14507: bash
File descriptor 8 (pipe:[841]) leaked on pvcreate invocation. Parent PID 14507: bash
   Writing physical volume data to disk "/dev/loop0"
#pvcreate /dev/loop1
File descriptor 6 (pipe:[839]) leaked on pvcreate invocation. Parent PID 14507: bash
File descriptor 8 (pipe:[841]) leaked on pvcreate invocation. Parent PID 14507: bash
   Writing physical volume data to disk "/dev/loop1"
#vgcreate test /dev/loop0 /dev/loop1
File descriptor 6 (pipe:[839]) leaked on vgcreate invocation. Parent PID 14507: bash
File descriptor 8 (pipe:[841]) leaked on vgcreate invocation. Parent PID 14507: bash
pvs
   Volume group "test" successfully created
#lvcreate -L 1M test
File descriptor 6 (pipe:[839]) leaked on lvcreate invocation. Parent PID 14507: bash
File descriptor 8 (pipe:[841]) leaked on lvcreate invocation. Parent PID 14507: bash
  Rounding up size to full physical extent 4,00 MiB
  Logical volume "lvol0" created
#echo a > /dev/test/lvol0
# cat /dev/test/lvol0
a
# pvmove /dev/loop0 /dev/loop1
File descriptor 6 (pipe:[839]) leaked on pvmove invocation. Parent PID 14507: bash
File descriptor 8 (pipe:[841]) leaked on pvmove invocation. Parent PID 14507: bash
   /dev/loop0: Moved: 100,0%
# cat /dev/test/lvol0
#