From patchwork Wed Jan 11 11:38:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Wagner X-Patchwork-Id: 13096498 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 5AE55C5479D for ; Wed, 11 Jan 2023 11:40:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235407AbjAKLkX (ORCPT ); Wed, 11 Jan 2023 06:40:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37820 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234100AbjAKLjx (ORCPT ); Wed, 11 Jan 2023 06:39:53 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 48FBA19C06; Wed, 11 Jan 2023 03:38:50 -0800 (PST) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id 7D9C74741; Wed, 11 Jan 2023 11:38:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1673437128; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=UwPyPIetNY3DBB0fSVp3q4vAm/+Fo0XhsHWOsHHGIUI=; b=YY0V/kE2OIgigKX91FgSqFdKg1MvTPPtnW+FU7rFyf9gBrBmitP+fmgRZrVbi0waj6TG2e 6nD/o5PaB+ipjykGZ5pK7x0m6Qo+Dgo6IkCwZZWSmTTttvikXVb0/U9c2kpM1vUNb35L+M lYUiuOhw6CqV+dLakwbaOyPia6GL0Nk= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1673437128; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=UwPyPIetNY3DBB0fSVp3q4vAm/+Fo0XhsHWOsHHGIUI=; b=J2Cr3bxyA6vSXDDHYjJWLmQKMnj36Cssv1mwlSS9oTAr/yA1bznUNLMdhW49WszAmc0kBh aRL/p95Lm84tWwAg== Received: from adalid.arch.suse.de (adalid.arch.suse.de [10.161.8.13]) by relay2.suse.de (Postfix) with ESMTP id 761A52C141; Wed, 11 Jan 2023 11:38:48 +0000 (UTC) Received: by adalid.arch.suse.de (Postfix, from userid 17828) id 6AC7E51B7ABB; Wed, 11 Jan 2023 12:38:48 +0100 (CET) From: Daniel Wagner To: James Smart Cc: Dick Kennedy , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Wagner Subject: [PATCH v2] lpfc: Handle gracefully failed FLOGI attempts in devloss callback Date: Wed, 11 Jan 2023 12:38:41 +0100 Message-Id: <20230111113841.108588-1-dwagner@suse.de> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org When FLOGI attempts fail, the vport can be released via lpfc_nlp_release() function. This function will set the pointer to NULL and the node state to NLP_STE_FREED_NODE. Though it wont stop the devloss timer in the upper SCSI layer. Hence when the devloss timer eventually fires, lpfc_dev_loss_tmo_callbk() is called and it tries to operate on vport NULL pointer. Just do nothing in this case. To be extra cautions also check for the state and issue a warning if we have an inconsistency. Signed-off-by: Daniel Wagner --- changes: v2: - this time with code (/me fights with evil-mode) v1: - initial version lpfc 0000:65:00.1: 94: [20252.520693] 7:0357 ELS CQE error: status=x3: CQE: 116b0300 00000000 31420002 90010000 lpfc 0000:65:00.1: 95: [20252.520707] 7:0321 Rsp Ring 2 error: IOCB Data: x116b0300 x0 x31420002 x90010000 lpfc 0000:65:00.1: 7:(0):2858 FLOGI failure Status:x3/x31420002 TMO:x14 Data x11140820 x0 rport-18:0-1: blocked FC remote port time out: removing rport **** lpfc_rport_invalid: Null vport on ndlp xffff88828bd82e00, DID xfffffe rport xffff8884f936e000 SID xffffffff BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 14 PID: 86204 Comm: kworker/14:0 Tainted: G OE X 5.14.21-150400.24.18-default #1 SLE15-SP4 695ab7a8fc20f5ddb345280570966cd1eb06d469 Hardware name: XXXX Workqueue: fc_wq_18 fc_rport_final_delete [scsi_transport_fc] RIP: e030:lpfc_dev_loss_tmo_callbk+0x50/0x4d0 [lpfc] Code: 00 00 00 0f b7 8b ac 00 00 00 48 c7 c2 e0 d1 c6 c0 44 8b 83 98 00 00 00 44 8b 8b 94 00 00 00 48 89 fd be 80 00 00 00 4c 89 e7 <4d> 8b 2c 24 e8 37 9e 04 00 4c 8b 83 f8 00 00 00 41 8b 90 e0 02 00 RSP: e02b:ffffc9004d853e38 EFLAGS: 00010286 RAX: ffff8884f936e510 RBX: ffff88828bd82e00 RCX: 000000000000ffff RDX: ffffffffc0c6d1e0 RSI: 0000000000000080 RDI: 0000000000000000 RBP: ffff8884f936e000 R08: 0000000000fffffe R09: 0000000000000000 R10: ffffc900401fbd98 R11: ffffc9004d853c80 R12: 0000000000000000 R13: ffff8884f936e000 R14: ffff88810b705000 R15: ffff888126973080 FS: 0000000000000000(0000) GS:ffff88888e980000(0000) knlGS:0000000000000000 CS: e030 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000103f50000 CR4: 0000000000050660 Call Trace: fc_rport_final_delete+0xec/0x1c0 [scsi_transport_fc e9142b03c2f4a15da538eb15a15c5b37fc11a87f] process_one_work+0x264/0x440 ? process_one_work+0x440/0x440 worker_thread+0x2d/0x3d0 ? process_one_work+0x440/0x440 kthread+0x154/0x180 ? set_kthread_struct+0x50/0x50 ret_from_fork+0x1f/0x30 drivers/scsi/lpfc/lpfc_hbadisc.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 83d2b29ee2a6..e7dd5f90d6c4 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -160,6 +160,19 @@ lpfc_dev_loss_tmo_callbk(struct fc_rport *rport) if (!ndlp) return; + if (!ndlp->vport) { + /* + * dev loss timer from the scsi layer might time out after + * failed FLOGI attempts. In this case the node will alreay be + * freed via lpfc_nlp_release(), which frees the vport pointer + * and sets the state to NLP_STE_FREED_NODE. + */ + WARN_ONCE(ndlp->nlp_state != NLP_STE_FREED_NODE, + "**** %s, vport NULL but ntp_state is not in freed state", + __func__); + return; + } + vport = ndlp->vport; phba = vport->phba;