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 1576DC61DA4 for ; Wed, 15 Mar 2023 12:36:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232693AbjCOMgs (ORCPT ); Wed, 15 Mar 2023 08:36:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232705AbjCOMgc (ORCPT ); Wed, 15 Mar 2023 08:36:32 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFFC87EDD for ; Wed, 15 Mar 2023 05:35:33 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1806D61ABD for ; Wed, 15 Mar 2023 12:35:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2E624C433D2; Wed, 15 Mar 2023 12:35:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678883729; bh=D6Iwx/I3L/qpXbBs9lZmGTsC5T4t5wWN6hzqYI5dp7o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tr95/YE+bBdMXqlcfNda02tLjt0ODdoSadSrupX1q25LJzmojs8lMi8+r6vNgo67W KJAcCgN0y5DcdeDeTXcPrMYkTnil0VwEVQKOteGF4jUa5nVTcz2z1jU3scqijaTsoL qtvtQQXHLsV2hoic+EzdiVkgZW23kKDsUe53F/tE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Benjamin Coddington , Jeff Layton , Chuck Lever , Sasha Levin Subject: [PATCH 6.1 108/143] SUNRPC: Fix a server shutdown leak Date: Wed, 15 Mar 2023 13:13:14 +0100 Message-Id: <20230315115743.776854549@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230315115740.429574234@linuxfoundation.org> References: <20230315115740.429574234@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Benjamin Coddington [ Upstream commit 9ca6705d9d609441d34f8b853e1e4a6369b3b171 ] Fix a race where kthread_stop() may prevent the threadfn from ever getting called. If that happens the svc_rqst will not be cleaned up. Fixes: ed6473ddc704 ("NFSv4: Fix callback server shutdown") Signed-off-by: Benjamin Coddington Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever Signed-off-by: Sasha Levin --- net/sunrpc/svc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index 24577d1b99079..9ee32e06f877e 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -787,6 +787,7 @@ svc_start_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) static int svc_stop_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) { + struct svc_rqst *rqstp; struct task_struct *task; unsigned int state = serv->sv_nrthreads-1; @@ -795,7 +796,10 @@ svc_stop_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) task = choose_victim(serv, pool, &state); if (task == NULL) break; - kthread_stop(task); + rqstp = kthread_data(task); + /* Did we lose a race to svo_function threadfn? */ + if (kthread_stop(task) == -EINTR) + svc_exit_thread(rqstp); nrservs++; } while (nrservs < 0); return 0; -- 2.39.2