From fd4d9c7d0c71866ec0c2825189ebd2ce35bd95b8 Mon Sep 17 00:00:00 2001 From: Jann Horn Date: Tue, 17 Mar 2020 01:28:45 +0100 Subject: mm: slub: add missing TID bump in kmem_cache_alloc_bulk() When kmem_cache_alloc_bulk() attempts to allocate N objects from a percpu freelist of length M, and N > M > 0, it will first remove the M elements from the percpu freelist, then call ___slab_alloc() to allocate the next element and repopulate the percpu freelist. ___slab_alloc() can re-enable IRQs via allocate_slab(), so the TID must be bumped before ___slab_alloc() to properly commit the freelist head change. Fix it by unconditionally bumping c->tid when entering the slowpath. Cc: stable@vger.kernel.org Fixes: ebe909e0fdb3 ("slub: improve bulk alloc strategy") Signed-off-by: Jann Horn Signed-off-by: Linus Torvalds --- mm/slub.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'mm/slub.c') diff --git a/mm/slub.c b/mm/slub.c index 17dc00e33115..eae5bb47b22f 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3174,6 +3174,15 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size, void *object = c->freelist; if (unlikely(!object)) { + /* + * We may have removed an object from c->freelist using + * the fastpath in the previous iteration; in that case, + * c->tid has not been bumped yet. + * Since ___slab_alloc() may reenable interrupts while + * allocating memory, we should bump c->tid now. + */ + c->tid = next_tid(c->tid); + /* * Invoking slow path likely have side-effect * of re-populating per CPU c->freelist -- cgit v1.2.3