Comment 3 for bug 1626564

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