When I first saw this last year Lukas correctly identified the problem, sorry for not mentioning this.
Now it happened again and it turned out that this bug report was one of only 2 google hits about it. I had forgotten about having this problem before. Could you please patch the btrfs utility to give a hint to the user that a paused balance might be the culprit? -- My Main Blog http://etbe.coker.com.au/ My Documents Blog http://doc.coker.com.au/