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 62EB9222576; Mon, 23 Jun 2025 22:14:17 +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=1750716857; cv=none; b=pJT3a6a/oAoZLjU4BxArllAViwLbLR+xACBmNjbYY5b0svS2E8MH+EpEd3xCZC353eyrn+rS/kMbGp0kPWZqePinTSbE0kTGcj/78xx06ocf6oqT+UToCn9kFxRmHaGYpvuFQqB9IgEtZZVBATozileEba/iiF4UfptLpFA/yno= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1750716857; c=relaxed/simple; bh=401bkhnEdqCZBTUgD4GpZT9o6NbNWqQWxQNg/28yCD0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u1XUWPUyOQI1nsMtxX0QlRZVVOaEATvTQWvK8qRV9wJE0jUuexNtB1UCB9eWqpvgbp/hBwTpagKg7CiljE4MZWCQ5Kear1vmU7Fj81+jyQ065EtAExMdPf+g288WOA9huXuYWA7nfn3K2uR7DTvzi82V1PRUdUu8xQCYZ0rnDN0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RN9Z4qb9; 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="RN9Z4qb9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EF7B0C4CEEA; Mon, 23 Jun 2025 22:14:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1750716857; bh=401bkhnEdqCZBTUgD4GpZT9o6NbNWqQWxQNg/28yCD0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RN9Z4qb9bnJRrM+r7qHdHzfUCUOCfnzP0mmOtJhszS2n5eL954EUYAQtAcMjsRWNm AY6/27K64f5oKl2cv5blKSUiGdwhDFYBWnwMpd5lYwzJuil5eN/ZkOHEGGos+HJLPw YmS7KlnmEEebGeobtRafUmaqHIpMAmku3aFJcut4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Paulo Alcantara (Red Hat)" , Meetakshi Setiya , zhangjian , Steve French Subject: [PATCH 6.15 563/592] smb: client: fix first command failure during re-negotiation Date: Mon, 23 Jun 2025 15:08:41 +0200 Message-ID: <20250623130713.833420593@linuxfoundation.org> X-Mailer: git-send-email 2.50.0 In-Reply-To: <20250623130700.210182694@linuxfoundation.org> References: <20250623130700.210182694@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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: zhangjian commit 34331d7beed7576acfc98e991c39738b96162499 upstream. after fabc4ed200f9, server_unresponsive add a condition to check whether client need to reconnect depending on server->lstrp. When client failed to reconnect for some time and abort connection, server->lstrp is updated for the last time. In the following scene, server->lstrp is too old. This cause next command failure in re-negotiation rather than waiting for re-negotiation done. 1. mount -t cifs -o username=Everyone,echo_internal=10 //$server_ip/export /mnt 2. ssh $server_ip "echo b > /proc/sysrq-trigger &" 3. ls /mnt 4. sleep 21s 5. ssh $server_ip "service firewalld stop" 6. ls # return EHOSTDOWN If the interval between 5 and 6 is too small, 6 may trigger sending negotiation request. Before backgrounding cifsd thread try to receive negotiation response from server in cifs_readv_from_socket, server_unresponsive may trigger cifs_reconnect which cause 6 to be failed: ls thread ---------------- smb2_negotiate server->tcpStatus = CifsInNegotiate compound_send_recv wait_for_compound_request cifsd thread ---------------- cifs_readv_from_socket server_unresponsive server->tcpStatus == CifsInNegotiate && jiffies > server->lstrp + 20s cifs_reconnect cifs_abort_connection: mid_state = MID_RETRY_NEEDED ls thread ---------------- cifs_sync_mid_result return EAGAIN smb2_negotiate return EHOSTDOWN Though server->lstrp means last server response time, it is updated in cifs_abort_connection and cifs_get_tcp_session. We can also update server->lstrp before switching into CifsInNegotiate state to avoid failure in 6. Fixes: 7ccc1465465d ("smb: client: fix hang in wait_for_response() for negproto") Acked-by: Paulo Alcantara (Red Hat) Acked-by: Meetakshi Setiya Signed-off-by: zhangjian Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/client/connect.c | 1 + 1 file changed, 1 insertion(+) --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -4193,6 +4193,7 @@ retry: return 0; } + server->lstrp = jiffies; server->tcpStatus = CifsInNegotiate; spin_unlock(&server->srv_lock);