From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A84AEE95A91 for ; Mon, 9 Oct 2023 13:25:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1376785AbjJINZs (ORCPT ); Mon, 9 Oct 2023 09:25:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38530 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376708AbjJINZq (ORCPT ); Mon, 9 Oct 2023 09:25:46 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 41686D3 for ; Mon, 9 Oct 2023 06:25:38 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 70FD1C433C8; Mon, 9 Oct 2023 13:25:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696857937; bh=Oc7h8eGbnpiJJ+dk+KhcYNp94L/yoUbUVlq0lauEWxw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KlbS9XcL/CXPHL+BCl9L2rAQ0y5YTF79d51bVbHJUhkJOuN84jqv2NjqFNnSGwNV/ XxMVwXnbDF5hJO1O1e1LXSKNQPiRFanrdOQTQjL7leOoDRJ37ya6ASRZPb+5Vqbs5h lnw8GtoC9t0E6DWEKlGO0BQQ+mAJ2Yt7ZHpRbQRU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Trond Myklebust , Anna Schumaker , Sasha Levin Subject: [PATCH 5.15 41/75] NFSv4: Fix a nfs4_state_manager() race Date: Mon, 9 Oct 2023 15:02:03 +0200 Message-ID: <20231009130112.673817240@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231009130111.200710898@linuxfoundation.org> References: <20231009130111.200710898@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Trond Myklebust [ Upstream commit ed1cc05aa1f7fe8197d300e914afc28ab9818f89 ] If the NFS4CLNT_RUN_MANAGER flag got set just before we cleared NFS4CLNT_MANAGER_RUNNING, then we might have won the race against nfs4_schedule_state_manager(), and are responsible for handling the recovery situation. Fixes: aeabb3c96186 ("NFSv4: Fix a NFSv4 state manager deadlock") Signed-off-by: Trond Myklebust Signed-off-by: Anna Schumaker Signed-off-by: Sasha Levin --- fs/nfs/nfs4state.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c index 7590d059eb78e..258e6b167285c 100644 --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -2699,6 +2699,13 @@ static void nfs4_state_manager(struct nfs_client *clp) nfs4_end_drain_session(clp); nfs4_clear_state_manager_bit(clp); + if (test_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state) && + !test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, + &clp->cl_state)) { + memflags = memalloc_nofs_save(); + continue; + } + if (!test_and_set_bit(NFS4CLNT_RECALL_RUNNING, &clp->cl_state)) { if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) { nfs_client_return_marked_delegations(clp); -- 2.40.1