I had a problem with pbuilder on wheezy. This Launchpad bug might be related:
https://bugs.launchpad.net/ubuntu/+source/util-linux/+bug/805886 I tested this fix in the Debian package for util-linux: https://code.launchpad.net/~pr0gg3d/ubuntu/oneiric/util-linux/bug-805886/+merge/70680 and it fixed the problem perfectly for Wheezy.
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