Revert "Fix memory leak"

This reverts commit 220ce7edbcf6f14c261cda9f02cf28f7d1c7b8b7.
Revert "backport SLUB from Linux 3.3 (thanks to faux123)"

This reverts commit e29114362a535a81770265e5d544150adf326f3c.
Fixes, caued kp