I confirm that reverting the SLAB / SLUB changes in the ubuntu kernel configuration file for mainline kernel 4.8-rc7 to the state they were in for mainline kernel 4.7-rc4 fixes the issue (note, I disable debug, because otherwise it takes over twice as long to compile the kernel, and it is enormous):
$ scripts/diffconfig .config .config-4.8.0-040800rc7-generic -HAVE_ALIGNED_STRUCT_PAGE y -SLUB_CPU_PARTIAL y -SLUB_DEBUG y -SLUB_DEBUG_ON n -SLUB_STATS n DEBUG_INFO n -> y SLAB n -> y SLAB_FREELIST_RANDOM n -> y SLUB y -> n +DEBUG_INFO_DWARF4 n +DEBUG_INFO_REDUCED n +DEBUG_INFO_SPLIT n +DEBUG_SLAB n +GDB_SCRIPTS n -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1626564 Title: 4.8 regression: SLAB is being used instead of SLUB To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1626564/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs