Hi! FYI, I noticed that if you do something like the following as root, the system blows up pretty quickly with error messages about stuff like corrupt freelist pointers because SLUB actually allows root to force a page order that is smaller than what is required to store a single object: echo 0 > /sys/kernel/slab/task_struct/order The other SLUB debugging options, like red_zone, also look kind of suspicious with regards to races (either racing with other writes to the SLUB debugging options, or with object allocations).