On Fri, Jul 29, 2016 at 9:10 PM, Vegard Nossum <[email protected]> wrote: > On 07/29/2016 08:05 PM, Dmitry Vyukov wrote: >> >> On Fri, Jul 29, 2016 at 7:57 PM, Vegard Nossum <[email protected]> >> wrote: >>> >>> ------------[ cut here ]------------ >>> kernel BUG at mm/mempolicy.c:1699! > > [...] >>> >>> In particular, it's interesting that the kernel/exit.c line is >>> >>> mpol_put(tsk->mempolicy); >>> >>> and alloc_pages_current() does (potentially): >>> >>> pol = get_task_policy(current);. >>> >>> The bug seems very new or very rare or both. >> >> >> This is https://github.com/google/kasan/issues/35 >> It is introduced with stackdepot. > > > Ah, cool. > > Would it be enough to set __GFP_THISNODE in depot_save_stack() so it > uses &default_policy instead of current->mempolicy?
I don't have deep understanding of that code. But looks at the code, using &default_policy should help.
