From nobody Sat Jul 25 03:47:43 2026 Received: from mxhk.zte.com.cn (mxhk.zte.com.cn [160.30.148.35]) (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 B06EE27456 for ; Sun, 19 Jul 2026 03:37:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=160.30.148.35 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784432232; cv=none; b=ke107QQgkkd01kgkNKKq4vOmWVT0hzWFp86hCTFZkzX8RjKCNPGmyz45ZdkWHjOXL06jRVcf9PRuOFA1HZvlNH1d91T78EqHRSaDIlla0242rciQqEOl2KZaBtl/G8XUuQmo/cYjMIufLwNZT7OjbQx4ufAtvIoy59kRusfuXJU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784432232; c=relaxed/simple; bh=oNuKng2QpwQsDi5NpfqZuFzgNe2x0E1Ea65mkNC9qkY=; h=Message-ID:Date:Mime-Version:From:To:Cc:Subject:Content-Type; b=akx8oSAxcLvTiELtl+UEkkcn5OhYnO//kjlxMV23cnXR1JZfVaWt9ehxGHcIs8WBH8UqecTOXE2Zr3wzur78Jzd4Yhs0cmMMk2LxL8hGbtQ+hm7vBFxOIhamXmN9/dPkjevSk2pT9HNRW6BKqnyP/j9bmFe+4/eTKpCbnKiJAE8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zte.com.cn; spf=pass smtp.mailfrom=zte.com.cn; arc=none smtp.client-ip=160.30.148.35 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=zte.com.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=zte.com.cn Received: from mse-fl1.zte.com.cn (unknown [10.5.228.132]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mxhk.zte.com.cn (FangMail) with ESMTPS id 4h2q8N0MD4z8Xrr9; Sun, 19 Jul 2026 11:37:08 +0800 (CST) Received: from xaxapp05.zte.com.cn ([10.99.98.109]) by mse-fl1.zte.com.cn with SMTP id 66J3b2MU030228; Sun, 19 Jul 2026 11:37:02 +0800 (+08) (envelope-from hu.shengming@zte.com.cn) Received: from mapi (xaxapp02[null]) by mapi (Zmail) with MAPI id mid32; Sun, 19 Jul 2026 11:37:01 +0800 (CST) X-Zmail-TransId: 2afa6a5c465d9b9-512e7 X-Mailer: Zmail v1.0 Message-ID: <20260719113701797vZ3R8NxiqYt8dEfeUxtON@zte.com.cn> Date: Sun, 19 Jul 2026 11:37:01 +0800 (CST) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 From: To: , , Cc: , , , , , , , Subject: =?UTF-8?B?W1BBVENIXSBtbS9zbHViOiBwcmV2ZW50IHBmbWVtYWxsb2Mgb2JqZWN0cyBmcm9tIGVudGVyaW5nIHRoZSBiYXJu?= X-MAIL: mse-fl1.zte.com.cn 66J3b2MU030228 X-TLS: YES X-ENVELOPE-SENDER: hu.shengming@zte.com.cn X-SOURCE-IP: 10.5.228.132 unknown Sun, 19 Jul 2026 11:37:08 +0800 X-CLEAN: YES X-Fangmail-Anti-Spam-Filtered: true X-Fangmail-MID-QID: 6A5C4664.000/4h2q8N0MD4z8Xrr9 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Shengming Hu kmem_cache_return_sheaf() may refill a partially consumed sheaf before placing it in the barn. Without an explicit restriction, this refill may draw objects from pfmemalloc slabs and consume emergency reserves. Add __GFP_NOMEMALLOC so returned sheaves are refilled only from normal memory. If that fails, flush and free the sheaf instead. Signed-off-by: Shengming Hu --- mm/slub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index 53b4976d3831..34f17ecbde87 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -5123,7 +5123,7 @@ void kmem_cache_return_sheaf(struct kmem_cache *s, gf= p_t gfp, * simply flush and free it. */ if (!barn || data_race(barn->nr_full) >=3D MAX_FULL_SHEAVES || - refill_sheaf(s, sheaf, gfp)) { + refill_sheaf(s, sheaf, gfp | __GFP_NOMEMALLOC)) { sheaf_flush_unused(s, sheaf); free_empty_sheaf(s, sheaf); return; --=20 2.25.1