From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A0032264AB; Wed, 7 Oct 2026 00:53:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334389; cv=none; b=W5O4ekcT6gkmaTJabrgfRf/wfe9/4mkgbNf9uAQU5ZEKWbgYAfNmKE/XkGDsl4KThvA8dl4p01Lr4BYmPYLj0zFgE3zY6mEbBP5RA4cHpYMlhsPNGMTnDr9rLsGS9u/GOJrZeJJo5raV7tPPJFs12zGlGqasL3WfZXH9ddOqzAU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334389; c=relaxed/simple; bh=74dNvMGve2pZvwywao/PQVv6aA1LxxPh0HQxmoj7qcM=; h=Date:To:From:Subject:Message-Id; b=DhizdzD7WEMKkhIAaDUvmyPQHIaBfZGDe81Pzb+Gtu8xp2BkLEr/5+fRiBvy4ugaLFOQcuNu/KHITvJAgbJJOMgpykzvZIuCJsXYwBQujRJKOjKoy0CYIktXKoLdivIhQM8OxeuMg54pUz6e6bnd1+WWgnv0MiJu9b910vP+4mw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=X/EPsl6n; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="X/EPsl6n" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5D5581F0089C; Wed, 7 Oct 2026 00:53:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791334388; bh=RmJy45UiwGrapkPoWNzvhXINnviPLi57uE9SXlUsKkg=; h=Date:To:From:Subject; b=X/EPsl6nxVkqqA3My1xLOUZggwtp5P/1dViIpp4hCbayPmZkgAkWoF+qWzIGy5dYF oeCnUv/SJiST3Z8Z5wpo+6iD+UScNe7rh0tP2g/vp6q5bgK3jcBaCRSz4lUordps7a zAEEhUH1WJgfPmbB7Kzn5IwbiT50mLpP2Aa+aT+c= Date: Tue, 06 Oct 2026 17:53:08 -0700 To: mm-commits@vger.kernel.org,vbabka@kernel.org,vannapurve@google.com,surenb@google.com,stable@vger.kernel.org,si.yanteng@linux.dev,shakeel.butt@linux.dev,rppt@kernel.org,roman.gushchin@linux.dev,rientjes@google.com,peterx@redhat.com,osalvador@suse.de,nphamcs@gmail.com,muchun.song@linux.dev,mhocko@kernel.org,mawupeng1@huawei.com,louhongxiang@huawei.com,ljs@kernel.org,linmiaohe@huawei.com,liam@infradead.org,jthoughton@google.com,joshua.hahnjy@gmail.com,hannes@cmpxchg.org,fvdl@google.com,dzm91@hust.edu.cn,david@kernel.org,corbet@lwn.net,alexs@kernel.org,ackerleytng@google.com,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-hugetlb-drop-refcount-before-freeing-on-memcg-charge-failure.patch removed from -mm tree Message-Id: <20261007005308.5D5581F0089C@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm: hugetlb: drop refcount before freeing on memcg charge failure has been removed from the -mm tree. Its filename was mm-hugetlb-drop-refcount-before-freeing-on-memcg-charge-failure.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Ackerley Tng Subject: mm: hugetlb: drop refcount before freeing on memcg charge failure Date: Wed, 09 Sep 2026 10:11:01 -0700 When mem_cgroup_charge_hugetlb(folio, gfp) returns -ENOMEM, the folio has its refcount set to 1 via folio_ref_unfreeze(folio, 1). The error path calls free_huge_folio(folio) directly, which expects a refcount of 0. Hence, VM_BUG_ON_FOLIO(folio_ref_count(folio), folio) is triggered. Even with CONFIG_DEBUG_VM disabled, returning a folio with refcount 1 to the freelist can corrupt allocator state later. Use folio_put(folio) instead of free_huge_folio(folio) to properly drop the reference before freeing it. Link: https://lore.kernel.org/20260909-hugetlb-alloc-folio-memcg-charge-error-handling-v2-2-4b4a8a19a7f7@google.com Fixes: 991135774c0e ("memcg/hugetlb: introduce mem_cgroup_charge_hugetlb") Signed-off-by: Ackerley Tng Signed-off-by: Andrew Morton Reviewed-by: Muchun Song Reviewed-by: Joshua Hahn Cc: Alex Shi Cc: David Hildenbrand Cc: David Rientjes Cc: Dongliang Mu Cc: Frank van der Linden Cc: Hongxiang Lou Cc: James Houghton Cc: Johannes Weiner Cc: Jonathan Corbet Cc: Liam R. Howlett Cc: Lorenzo Stoakes Cc: Ma Wupeng Cc: Miaohe Lin Cc: Michal Hocko Cc: Mike Rapoport Cc: Nhat Pham Cc: Oscar Salvador Cc: Peter Xu Cc: Roman Gushchin Cc: Shakeel Butt Cc: Suren Baghdasaryan Cc: Vishal Annapurve Cc: Vlastimil Babka Cc: Yanteng Si Cc: --- mm/hugetlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/hugetlb.c~mm-hugetlb-drop-refcount-before-freeing-on-memcg-charge-failure +++ a/mm/hugetlb.c @@ -2917,7 +2917,7 @@ struct folio *hugetlb_alloc_folio(struct lruvec_stat_mod_folio(folio, NR_HUGETLB, nr_pages); if (ret == -ENOMEM) { - free_huge_folio(folio); + folio_put(folio); /* * Skip uncharging hugetlb_cgroup since the charges * were committed to the folio and freeing the folio _ Patches currently in -mm which might be from ackerleytng@google.com are