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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, 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 10ACFC43603 for ; Fri, 20 Dec 2019 14:35:49 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D99B3206CB for ; Fri, 20 Dec 2019 14:35:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="PGyEgNcs"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="x4/vMA3r" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D99B3206CB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=oBhVDCTA8z/+A6e+uHVr5cTxIjR+W4TJRvYPeD3dCxo=; b=PGyEgNcsi8Bv/b D1+E8xDrSXd0ISlh05C9jcF8AoIY0c6X7Gh8AuwII6FAmrzKgT+LJbx0L+2FCNgnqjeHojMFds8lo 4CjrghqWADlYdlkii9LOPBc9XL0oNDpsKTFu5xhW8FGsGOEM+nbdUjy3weeb11iEPhXFkyuNvD4hD out7jTRnsU8nJJUl8oiQgNA16cF8aFL4nAHCW1qN+F5pb4v5spclp+T/LyUq4iYLgvjPZZLIF74Ti Hqd2DHU/aHckTlP03WrfIJ3DwWEmy4gwKCIpFO1qtS89JJ2bTMJMDFWbxLGH0+APwjugzONh0QrvB KgTXv7auQRuphgVItNIA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iiJNa-0007MN-30; Fri, 20 Dec 2019 14:35:46 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iiJMT-0005RE-CE for linux-nvme@lists.infradead.org; Fri, 20 Dec 2019 14:35:00 +0000 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E974524684; Fri, 20 Dec 2019 14:34:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576852476; bh=7CbyhLown2+ZTssUCg+XJlvPODqqCNyO77ZM0dVKEqI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=x4/vMA3r+N+BLB9kBK7BDrwU2XYFoQ7YDGclvJPj7NXObyqaWCUT5Fwh8PUWNMCO1 o//ufyOO19fRFBrRRwoGtXMKixvGW/IpcANXkj1EjzYaOUqq+T54c+6lK4rSjCpKEz Xm3yV1jqPTNaUt1JshAcQMOnR/hq0Qo00BOEQWeY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 02/34] nvme-fc: fix double-free scenarios on hw queues Date: Fri, 20 Dec 2019 09:34:01 -0500 Message-Id: <20191220143433.9922-2-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191220143433.9922-1-sashal@kernel.org> References: <20191220143433.9922-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191220_063437_486967_8D1CB30B X-CRM114-Status: GOOD ( 18.20 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , James Smart , linux-nvme@lists.infradead.org, "Ewan D . Milne" , Keith Busch , Himanshu Madhani Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org From: James Smart [ Upstream commit c869e494ef8b5846d9ba91f1e922c23cd444f0c1 ] If an error occurs on one of the ios used for creating an association, the creating routine has error paths that are invoked by the command failure and the error paths will free up the controller resources created to that point. But... the io was ultimately determined by an asynchronous completion routine that detected the error and which unconditionally invokes the error_recovery path which calls delete_association. Delete association deletes all outstanding io then tears down the controller resources. So the create_association thread can be running in parallel with the error_recovery thread. What was seen was the LLDD received a call to delete a queue, causing the LLDD to do a free of a resource, then the transport called the delete queue again causing the driver to repeat the free call. The second free routine corrupted the allocator. The transport shouldn't be making the duplicate call, and the delete queue is just one of the resources being freed. To fix, it is realized that the create_association path is completely serialized with one command at a time. So the failed io completion will always be seen by the create_association path and as of the failure, there are no ios to terminate and there is no reason to be manipulating queue freeze states, etc. The serialized condition stays true until the controller is transitioned to the LIVE state. Thus the fix is to change the error recovery path to check the controller state and only invoke the teardown path if not already in the CONNECTING state. Reviewed-by: Himanshu Madhani Reviewed-by: Ewan D. Milne Signed-off-by: James Smart Signed-off-by: Keith Busch Signed-off-by: Sasha Levin --- drivers/nvme/host/fc.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index d567035571bf2..1875f6b8a907b 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -2894,10 +2894,22 @@ nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status) static void __nvme_fc_terminate_io(struct nvme_fc_ctrl *ctrl) { - nvme_stop_keep_alive(&ctrl->ctrl); + /* + * if state is connecting - the error occurred as part of a + * reconnect attempt. The create_association error paths will + * clean up any outstanding io. + * + * if it's a different state - ensure all pending io is + * terminated. Given this can delay while waiting for the + * aborted io to return, we recheck adapter state below + * before changing state. + */ + if (ctrl->ctrl.state != NVME_CTRL_CONNECTING) { + nvme_stop_keep_alive(&ctrl->ctrl); - /* will block will waiting for io to terminate */ - nvme_fc_delete_association(ctrl); + /* will block will waiting for io to terminate */ + nvme_fc_delete_association(ctrl); + } if (ctrl->ctrl.state != NVME_CTRL_CONNECTING && !nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_CONNECTING)) -- 2.20.1 _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme