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 X-Spam-Level: X-Spam-Status: No, score=-7.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1D385C43441 for ; Mon, 19 Nov 2018 16:44:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8428214DA for ; Mon, 19 Nov 2018 16:44:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="oEsIbzlK" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D8428214DA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388397AbeKTDJE (ORCPT ); Mon, 19 Nov 2018 22:09:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:43912 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387555AbeKTDJD (ORCPT ); Mon, 19 Nov 2018 22:09:03 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 68BBA2145D; Mon, 19 Nov 2018 16:44:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1542645891; bh=ilXC9YEHtc75CupCnebjigc0y3F0JyWgwIjTdw920EY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oEsIbzlK3J/kXzmZZKVLuAIq7Hx8EBaxH2AbG7lTAoDNcIGp003jdnxgPQUe4gMe5 0KaTBgvEOaH+2qAwEsMcGKdOoYn2tgXJ2xI2BTwVobWA7MfsgFQpWUZGQe+dgQncbl +D3FeHZVz2uxPjTiwU3OJMVGW+PEroP/w1dlxypk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Trond Myklebust Subject: [PATCH 4.18 129/171] NFSv4: Dont exit the state manager without clearing NFS4CLNT_MANAGER_RUNNING Date: Mon, 19 Nov 2018 17:28:45 +0100 Message-Id: <20181119162637.858767955@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181119162618.909354448@linuxfoundation.org> References: <20181119162618.909354448@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Trond Myklebust commit 21a446cf186570168b7281b154b1993968598aca upstream. If we exit the NFSv4 state manager due to a umount, then we can end up leaving the NFS4CLNT_MANAGER_RUNNING flag set. If another mount causes the nfs4_client to be rereferenced before it is destroyed, then we end up never being able to recover state. Fixes: 47c2199b6eb5 ("NFSv4.1: Ensure state manager thread dies on last ...") Signed-off-by: Trond Myklebust Cc: stable@vger.kernel.org # v4.15+ Signed-off-by: Greg Kroah-Hartman --- fs/nfs/nfs4state.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/fs/nfs/nfs4state.c +++ b/fs/nfs/nfs4state.c @@ -2553,11 +2553,12 @@ static void nfs4_state_manager(struct nf nfs4_clear_state_manager_bit(clp); /* Did we race with an attempt to give us more work? */ if (clp->cl_state == 0) - break; + return; if (test_and_set_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) != 0) - break; + return; } while (refcount_read(&clp->cl_count) > 1); - return; + goto out_drain; + out_error: if (strlen(section)) section_sep = ": "; @@ -2565,6 +2566,7 @@ out_error: " with error %d\n", section_sep, section, clp->cl_hostname, -status); ssleep(1); +out_drain: nfs4_end_drain_session(clp); nfs4_clear_state_manager_bit(clp); }