On Tue, Oct 18, 2016 at 06:05:57PM -0700, Andy Lutomirski wrote: > One possible debugging approach would be to change: > > #define NR_CACHED_STACKS 2 > > to > > #define NR_CACHED_STACKS 0 > > in kernel/fork.c and to set CONFIG_DEBUG_PAGEALLOC=y. The latter will > force an immediate TLB flush after vfree.
I can give that idea some runtime, but it sounds like this a case where we're trying to prove a negative, and that'll just run and run ? In which case I might do this when I'm travelling on Sunday. > Also, CONFIG_DEBUG_VIRTUAL=y can be quite helpful for debugging stack > issues. I'm tempted to do something equivalent to hardwiring that > option on for a while if CONFIG_VMAP_STACK=y. This one I had on. Nothing interesting jumped out. Dave