Considering the "bug" on <2.6.7 x86 systems (see the URL given), it seems to me in everyone's best interests to remove the ~x86 mask from development-sources 2.6.7 asap. I have been running it perfectly well with no stability issues.
This issue is handled in bug 53804, once it has been resolved the kernel packages should be marked stable and GLSA will be send. *** This bug has been marked as a duplicate of 53804 ***