Troubleshooting in-kernel memory leak

Hello list, I have an AFS fileserver that suffers from an in-kernel memory leak. Slabtop shows "size-256" as consuming and never releasing RAM: 13633365 13633275 99% 0.25K 908891 15 3635564K size-256 Eventually the server begins to swap *everything* and becomes totally useless. A reboot is the only way to free the consumed RAM. Does anyone have any suggestion on how I can pinpoint the source of the memory consumption? Thanks much, --Blake Atkins