The Bug seems to be well known. There is a BugZilla entry [1] and a thread [2] with a fix [3] [1] https://bugzilla.kernel.org/show_bug.cgi?id=18892 [2] http://lkml.org/lkml/2010/9/19/164 [3] http://lkml.org/lkml/2010/9/21/160 Sorry for the noise. It will be fixed in rc6.