On Tue, Oct 25, 2016 at 11:07:47AM +0200, Michal Hocko wrote: > Acked-by: Michal Hocko <mhocko@xxxxxxxx> Thank you. > I would prefer to have the PF_MEMALLOC condition in a check on its own > with a short explanation that we really do not want to recurse to the > reclaim due to stack overflows. Okay, fair enough. I also added why we prefer temporarily breaching the limit over failing the allocation. How is this? >From 9034d2e6a21036774df9a8e021511720cf432c82 Mon Sep 17 00:00:00 2001 From: Johannes Weiner <hannes@xxxxxxxxxxx> Date: Mon, 24 Oct 2016 16:01:55 -0400 Subject: [PATCH] mm: memcontrol: do not recurse in direct reclaim On 4.0, we saw a stack corruption from a page fault entering direct memory cgroup reclaim, calling into btrfs_releasepage(), which then tried to allocate an extent and recursed back into a kmem charge ad nauseam: [...] [<ffffffff8136590c>] btrfs_releasepage+0x2c/0x30 [<ffffffff811559a2>] try_to_release_page+0x32/0x50 [<ffffffff81168cea>] shrink_page_list+0x6da/0x7a0 [<ffffffff811693b5>] shrink_inactive_list+0x1e5/0x510 [<ffffffff8116a0a5>] shrink_lruvec+0x605/0x7f0 [<ffffffff8116a37e>] shrink_zone+0xee/0x320 [<ffffffff8116a934>] do_try_to_free_pages+0x174/0x440 [<ffffffff8116adf7>] try_to_free_mem_cgroup_pages+0xa7/0x130 [<ffffffff811b738b>] try_charge+0x17b/0x830 [<ffffffff811bb5b0>] memcg_charge_kmem+0x40/0x80 [<ffffffff811a96a9>] new_slab+0x2d9/0x5a0 [<ffffffff817b2547>] __slab_alloc+0x2fd/0x44f [<ffffffff811a9b03>] kmem_cache_alloc+0x193/0x1e0 [<ffffffff813801e1>] alloc_extent_state+0x21/0xc0 [<ffffffff813820c5>] __clear_extent_bit+0x2b5/0x400 [<ffffffff81386d03>] try_release_extent_mapping+0x1a3/0x220 [<ffffffff813658a1>] __btrfs_releasepage+0x31/0x70 [<ffffffff8136590c>] btrfs_releasepage+0x2c/0x30 [<ffffffff811559a2>] try_to_release_page+0x32/0x50 [<ffffffff81168cea>] shrink_page_list+0x6da/0x7a0 [<ffffffff811693b5>] shrink_inactive_list+0x1e5/0x510 [<ffffffff8116a0a5>] shrink_lruvec+0x605/0x7f0 [<ffffffff8116a37e>] shrink_zone+0xee/0x320 [<ffffffff8116a934>] do_try_to_free_pages+0x174/0x440 [<ffffffff8116adf7>] try_to_free_mem_cgroup_pages+0xa7/0x130 [<ffffffff811b738b>] try_charge+0x17b/0x830 [<ffffffff811bbfd5>] mem_cgroup_try_charge+0x65/0x1c0 [<ffffffff8118338f>] handle_mm_fault+0x117f/0x1510 [<ffffffff81041cf7>] __do_page_fault+0x177/0x420 [<ffffffff81041fac>] do_page_fault+0xc/0x10 [<ffffffff817c0182>] page_fault+0x22/0x30 On later kernels, kmem charging is opt-in rather than opt-out, and that particular kmem allocation in btrfs_releasepage() is no longer being charged and won't recurse and overrun the stack anymore. But it's not impossible for an accounted allocation to happen from the memcg direct reclaim context, and we needed to reproduce this crash many times before we even got a useful stack trace out of it. Like other direct reclaimers, mark tasks in memcg reclaim PF_MEMALLOC to avoid recursing into any other form of direct reclaim. Then let recursive charges from PF_MEMALLOC contexts bypass the cgroup limit. Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> --- mm/memcontrol.c | 9 +++++++++ mm/vmscan.c | 2 ++ 2 files changed, 11 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ae052b5e3315..0f870ba43942 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1917,6 +1917,15 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, current->flags & PF_EXITING)) goto force; + /* + * Prevent unbounded recursion when reclaim operations need to + * allocate memory. This might exceed the limits temporarily, + * but we prefer facilitating memory reclaim and getting back + * under the limit over triggering OOM kills in these cases. + */ + if (unlikely(current->flags & PF_MEMALLOC)) + goto force; + if (unlikely(task_in_memcg_oom(current))) goto nomem; diff --git a/mm/vmscan.c b/mm/vmscan.c index 744f926af442..76fda2268148 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -3043,7 +3043,9 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg, sc.gfp_mask, sc.reclaim_idx); + current->flags |= PF_MEMALLOC; nr_reclaimed = do_try_to_free_pages(zonelist, &sc); + current->flags &= ~PF_MEMALLOC; trace_mm_vmscan_memcg_reclaim_end(nr_reclaimed); -- 2.10.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>