I experienced the same bug on 9.04
I tried moving the data from a 1TB (sdc) disk to a 1.5TB (sdh) disk and at 40% 
the machine had a kernel panic: out of memory

After the reboot I started pvmove -i 60 -v
At the moment it's at
  /dev/sdc: Moved: 15.5%
    Finding all volume groups
    Finding volume group "BFG"
  /dev/sdc: Moved: 15.8%

And I'm already getting 60 identical processes like this one
 8385 ?        S<s    0:00 (lvm2copy vgchange -a y

# ps axw | grep lvm| wc -l
60


** Attachment added: "dmesg"
   http://launchpadlibrarian.net/50298536/dmesg

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memory usage pvmove / Refactor pvmove allocation code
https://bugs.launchpad.net/bugs/321667
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