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 5299FC43219 for ; Mon, 30 May 2022 13:28:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237007AbiE3N2u (ORCPT ); Mon, 30 May 2022 09:28:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59346 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236808AbiE3N10 (ORCPT ); Mon, 30 May 2022 09:27:26 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BCBAF84A02; Mon, 30 May 2022 06:25:57 -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 B1B0360EA5; Mon, 30 May 2022 13:25:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 161F8C36AE7; Mon, 30 May 2022 13:25:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1653917147; bh=2KToFwkNvNzfdHZcKKJhemrDipNoBJWJHSrlZBAWX2s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KYMsTlRuxe7knRvbc1mGE/bxyE7UaxMYNaJ05MkxqVFJ5oEnznWHn02vT4Dsu9EpK 6d1vmt0WH3P4QHvXhZUZdFc5s8Xs5exY7msNKNfxM69oF4CKB1gojDWDiSo6klSEGv jtex8VZDjmM5YwRI3nWKcLj8iLIObR3ING/RZAlh2pWNvB6gKvlJ3qhpyg6uZt+RUv 9btudViPTMfrBNmglINbE81GfdiQNMpJLg6ygPr6CNaubK8zlEjSO+VH85J5p89zCB DxIQqW+oa3cXpPh+kJKwgxtGuIxa5fvRa+njXZZkBzgLkzFsi1FZpJh3jymiWjWSB+ pOYZMt4obRiKA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: James Smart , Justin Tee , "Martin K . Petersen" , Sasha Levin , james.smart@broadcom.com, dick.kennedy@broadcom.com, jejb@linux.ibm.com, linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.18 036/159] scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock Date: Mon, 30 May 2022 09:22:21 -0400 Message-Id: <20220530132425.1929512-36-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220530132425.1929512-1-sashal@kernel.org> References: <20220530132425.1929512-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: James Smart [ Upstream commit 03cbbd7c2f5ee288f648f4aeedc765a181188553 ] During stress I/O tests with 500+ vports, hard LOCKUP call traces are observed. CPU A: native_queued_spin_lock_slowpath+0x192 _raw_spin_lock_irqsave+0x32 lpfc_handle_fcp_err+0x4c6 lpfc_fcp_io_cmd_wqe_cmpl+0x964 lpfc_sli4_fp_handle_cqe+0x266 __lpfc_sli4_process_cq+0x105 __lpfc_sli4_hba_process_cq+0x3c lpfc_cq_poll_hdler+0x16 irq_poll_softirq+0x76 __softirqentry_text_start+0xe4 irq_exit+0xf7 do_IRQ+0x7f CPU B: native_queued_spin_lock_slowpath+0x5b _raw_spin_lock+0x1c lpfc_abort_handler+0x13e scmd_eh_abort_handler+0x85 process_one_work+0x1a7 worker_thread+0x30 kthread+0x112 ret_from_fork+0x1f Diagram of lockup: CPUA CPUB ---- ---- lpfc_cmd->buf_lock phba->hbalock lpfc_cmd->buf_lock phba->hbalock Fix by reordering the taking of the lpfc_cmd->buf_lock and phba->hbalock in lpfc_abort_handler routine so that it tries to take the lpfc_cmd->buf_lock first before phba->hbalock. Link: https://lore.kernel.org/r/20220412222008.126521-7-jsmart2021@gmail.com Co-developed-by: Justin Tee Signed-off-by: Justin Tee Signed-off-by: James Smart Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/lpfc/lpfc_scsi.c | 33 +++++++++++++++------------------ 1 file changed, 15 insertions(+), 18 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c index ba9dbb51b75f..c4fa7d68fe03 100644 --- a/drivers/scsi/lpfc/lpfc_scsi.c +++ b/drivers/scsi/lpfc/lpfc_scsi.c @@ -5864,25 +5864,25 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd) if (!lpfc_cmd) return ret; - spin_lock_irqsave(&phba->hbalock, flags); + /* Guard against IO completion being called at same time */ + spin_lock_irqsave(&lpfc_cmd->buf_lock, flags); + + spin_lock(&phba->hbalock); /* driver queued commands are in process of being flushed */ if (phba->hba_flag & HBA_IOQ_FLUSH) { lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP, "3168 SCSI Layer abort requested I/O has been " "flushed by LLD.\n"); ret = FAILED; - goto out_unlock; + goto out_unlock_hba; } - /* Guard against IO completion being called at same time */ - spin_lock(&lpfc_cmd->buf_lock); - if (!lpfc_cmd->pCmd) { lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP, "2873 SCSI Layer I/O Abort Request IO CMPL Status " "x%x ID %d LUN %llu\n", SUCCESS, cmnd->device->id, cmnd->device->lun); - goto out_unlock_buf; + goto out_unlock_hba; } iocb = &lpfc_cmd->cur_iocbq; @@ -5890,7 +5890,7 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd) pring_s4 = phba->sli4_hba.hdwq[iocb->hba_wqidx].io_wq->pring; if (!pring_s4) { ret = FAILED; - goto out_unlock_buf; + goto out_unlock_hba; } spin_lock(&pring_s4->ring_lock); } @@ -5923,8 +5923,8 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd) "3389 SCSI Layer I/O Abort Request is pending\n"); if (phba->sli_rev == LPFC_SLI_REV4) spin_unlock(&pring_s4->ring_lock); - spin_unlock(&lpfc_cmd->buf_lock); - spin_unlock_irqrestore(&phba->hbalock, flags); + spin_unlock(&phba->hbalock); + spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags); goto wait_for_cmpl; } @@ -5945,15 +5945,13 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd) if (ret_val != IOCB_SUCCESS) { /* Indicate the IO is not being aborted by the driver. */ lpfc_cmd->waitq = NULL; - spin_unlock(&lpfc_cmd->buf_lock); - spin_unlock_irqrestore(&phba->hbalock, flags); ret = FAILED; - goto out; + goto out_unlock_hba; } /* no longer need the lock after this point */ - spin_unlock(&lpfc_cmd->buf_lock); - spin_unlock_irqrestore(&phba->hbalock, flags); + spin_unlock(&phba->hbalock); + spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags); if (phba->cfg_poll & DISABLE_FCP_RING_INT) lpfc_sli_handle_fast_ring_event(phba, @@ -5988,10 +5986,9 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd) out_unlock_ring: if (phba->sli_rev == LPFC_SLI_REV4) spin_unlock(&pring_s4->ring_lock); -out_unlock_buf: - spin_unlock(&lpfc_cmd->buf_lock); -out_unlock: - spin_unlock_irqrestore(&phba->hbalock, flags); +out_unlock_hba: + spin_unlock(&phba->hbalock); + spin_unlock_irqrestore(&lpfc_cmd->buf_lock, flags); out: lpfc_printf_vlog(vport, KERN_WARNING, LOG_FCP, "0749 SCSI Layer I/O Abort Request Status x%x ID %d " -- 2.35.1