From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 7ACE81CF5C6; Wed, 7 May 2025 19:05:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746644724; cv=none; b=rd40HMaNtf+FQtDvOlhVrdlIhqZOqG0DPQCi2WzqYWMOvStaVhn7gYEVacptiXZjqWHffm9CPS7H4sGVXHycTwmcMkOD306PDtPtU/41e+PCykmDKjx7qskpJUfFIyVi1mDNSzypE2jVIAey6aUmVwvhCfvl0Ptvst0GaO12GDI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746644724; c=relaxed/simple; bh=TJUXeAejDKO7jrESi61OJ+6pHcjpMs5kA/vPU3oNSHA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=C30J0nCdZ3KMBdObzTS8WmNyzZPYfrXoZBGF8uuLLxdJrPEeEIaeG6G0Cy198/S7KRYdDI4FqlGWPVpePiPMMkBzm+s6aCM2g5MFRf5SccCV09GKuAWkRSo8GQ9ic824yt5L0ZrX4q7CvyPzCz2G1+4X+oEZXBqWfXfkqLSsREs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Mme267KL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Mme267KL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0279CC4CEE2; Wed, 7 May 2025 19:05:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1746644724; bh=TJUXeAejDKO7jrESi61OJ+6pHcjpMs5kA/vPU3oNSHA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Mme267KLOihLm361pw7vrs0DYHxQCC5H4sw34MG2vguYpfCInIuWOy7mwwrIQ8psX ewG6AUyPgKGfQG+bbWxTwEnWbctpdgHnJuHZ5dATm45gMjZTfVtunbp89voHeXQyWw JL/DH9FEkAh8909s26r5OpS8mbnb0eF9BPnK97Gc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Zhenhua Huang , David Rientjes , Harry Yoo , Suren Baghdasaryan , Vlastimil Babka Subject: [PATCH 6.12 137/164] mm, slab: clean up slab->obj_exts always Date: Wed, 7 May 2025 20:40:22 +0200 Message-ID: <20250507183826.520321014@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250507183820.781599563@linuxfoundation.org> References: <20250507183820.781599563@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhenhua Huang commit be8250786ca94952a19ce87f98ad9906448bc9ef upstream. When memory allocation profiling is disabled at runtime or due to an error, shutdown_mem_profiling() is called: slab->obj_exts which previously allocated remains. It won't be cleared by unaccount_slab() because of mem_alloc_profiling_enabled() not true. It's incorrect, slab->obj_exts should always be cleaned up in unaccount_slab() to avoid following error: [...]BUG: Bad page state in process... .. [...]page dumped because: page still charged to cgroup [andriy.shevchenko@linux.intel.com: fold need_slab_obj_ext() into its only user] Fixes: 21c690a349ba ("mm: introduce slabobj_ext to support slab object extensions") Cc: stable@vger.kernel.org Signed-off-by: Zhenhua Huang Acked-by: David Rientjes Acked-by: Harry Yoo Tested-by: Harry Yoo Acked-by: Suren Baghdasaryan Link: https://patch.msgid.link/20250421075232.2165527-1-quic_zhenhuah@quicinc.com Signed-off-by: Vlastimil Babka [surenb: fixed trivial merge conflict in alloc_tagging_slab_alloc_hook(), skipped inlining free_slab_obj_exts() as it's already inline in 6.12] Signed-off-by: Suren Baghdasaryan Signed-off-by: Greg Kroah-Hartman --- mm/slub.c | 27 +++++++-------------------- 1 file changed, 7 insertions(+), 20 deletions(-) --- a/mm/slub.c +++ b/mm/slub.c @@ -2035,18 +2035,6 @@ static inline void free_slab_obj_exts(st slab->obj_exts = 0; } -static inline bool need_slab_obj_ext(void) -{ - if (mem_alloc_profiling_enabled()) - return true; - - /* - * CONFIG_MEMCG creates vector of obj_cgroup objects conditionally - * inside memcg_slab_post_alloc_hook. No other users for now. - */ - return false; -} - #else /* CONFIG_SLAB_OBJ_EXT */ static inline void init_slab_obj_exts(struct slab *slab) @@ -2063,11 +2051,6 @@ static inline void free_slab_obj_exts(st { } -static inline bool need_slab_obj_ext(void) -{ - return false; -} - #endif /* CONFIG_SLAB_OBJ_EXT */ #ifdef CONFIG_MEM_ALLOC_PROFILING @@ -2099,7 +2082,7 @@ prepare_slab_obj_exts_hook(struct kmem_c static inline void alloc_tagging_slab_alloc_hook(struct kmem_cache *s, void *object, gfp_t flags) { - if (need_slab_obj_ext()) { + if (mem_alloc_profiling_enabled()) { struct slabobj_ext *obj_exts; obj_exts = prepare_slab_obj_exts_hook(s, flags, object); @@ -2577,8 +2560,12 @@ static __always_inline void account_slab static __always_inline void unaccount_slab(struct slab *slab, int order, struct kmem_cache *s) { - if (memcg_kmem_online() || need_slab_obj_ext()) - free_slab_obj_exts(slab); + /* + * The slab object extensions should now be freed regardless of + * whether mem_alloc_profiling_enabled() or not because profiling + * might have been disabled after slab->obj_exts got allocated. + */ + free_slab_obj_exts(slab); mod_node_page_state(slab_pgdat(slab), cache_vmstat_idx(s), -(PAGE_SIZE << order));