From patchwork Fri Jul 10 16:31:10 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: ian mitchell X-Patchwork-Id: 6766991 Return-Path: X-Original-To: patchwork-linux-scsi@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6BB7DC05AC for ; Fri, 10 Jul 2015 16:41:24 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 62952207AE for ; Fri, 10 Jul 2015 16:41:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4F3A9207AD for ; Fri, 10 Jul 2015 16:41:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932372AbbGJQlF (ORCPT ); Fri, 10 Jul 2015 12:41:05 -0400 Received: from relay3.sgi.com ([192.48.152.1]:54547 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932349AbbGJQlC (ORCPT ); Fri, 10 Jul 2015 12:41:02 -0400 X-Greylist: delayed 587 seconds by postgrey-1.27 at vger.kernel.org; Fri, 10 Jul 2015 12:41:02 EDT Received: from estes.americas.sgi.com (estes.americas.sgi.com [128.162.236.10]) by relay3.corp.sgi.com (Postfix) with ESMTP id 8389FAC002; Fri, 10 Jul 2015 09:31:14 -0700 (PDT) Received: from asylum.americas.sgi.com (asylum.americas.sgi.com [128.162.237.107]) by estes.americas.sgi.com (Postfix) with ESMTP id DF4137001D2F; Fri, 10 Jul 2015 11:31:13 -0500 (CDT) Received: by asylum.americas.sgi.com (Postfix, from userid 200163) id CBC7E826049; Fri, 10 Jul 2015 11:31:13 -0500 (CDT) From: ian mitchell To: linux-kernel@vger.kernel.org Cc: ian mitchell , Ian Mitchell , Alex Thorlton , James Smart , Dick Kennedy , "James E.J. Bottomley" , linux-scsi@vger.kernel.org Subject: [PATCH] Fix kmalloc overflow in LPFC driver at large core count Date: Fri, 10 Jul 2015 11:31:10 -0500 Message-Id: <1436545870-70261-1-git-send-email-imitchell@asylum.americas.sgi.com> X-Mailer: git-send-email 1.7.12.4 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch allows the LPFC to start up without a fatal kernel bug based on an exceeded KMALLOC_MAX_SIZE and a too large NR_CPU-based maskbits field. The bug was based on the number of CPU cores in a system. Using the get_cpu_mask() function declared in kernel/cpu.c allows the driver to load on the community kernel 4.2 RC1. Below is the kernel bug reproduced: 8<-------------------------------------------------------------------- 2199382.828437 ( 0.005216)| lpfc 0003:02:00.0: enabling device (0140 -> 0142) 2199382.999272 ( 0.170835)| ------------[ cut here ]------------ 2199382.999337 ( 0.000065)| WARNING: CPU: 84 PID: 404 at mm/slab_common.c:653 kmalloc_slab+0x2f/0x89() 2199383.004534 ( 0.005197)| Modules linked in: lpfc(+) usbcore(+) mptctl scsi_transport_fc sg lpc_ich i2c_i801 usb_common tpm_tis mfd_core tpm acpi_cpufreq button scsi_dh_alua scsi_dh_rdacusbcore: registered new device driver usb 2199383.020568 ( 0.016034)| 2199383.020581 ( 0.000013)| scsi_dh_hp_sw scsi_dh_emc scsi_dh gru thermal sata_nv processor piix fan thermal_sysehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver 2199383.035288 ( 0.014707)| 2199383.035306 ( 0.000018)| hwmon ata_piix 2199383.035336 ( 0.000030)| CPU: 84 PID: 404 Comm: kworker/84:0 Not tainted 3.18.0-rc2-gat-00106-ga7ca10f-dirty #178 2199383.047077 ( 0.011741)| ehci-pci: EHCI PCI platform driver 2199383.047134 ( 0.000057)| Hardware name: SGI UV2000/ROMLEY, BIOS SGI UV 2000/3000 series BIOS 01/15/2013 2199383.056245 ( 0.009111)| Workqueue: events work_for_cpu_fn 2199383.066174 ( 0.009929)| 000000000000028d ffff88eef827bbe8 ffffffff815a542f 000000000000028d 2199383.069545 ( 0.003371)| ffffffff810ea142 ffff88eef827bc28 ffffffff8104365c ffff88eefe4006c8 2199383.076214 ( 0.006669)| 0000000000000000 00000000000080d0 0000000000000000 0000000000000004 2199383.079213 ( 0.002999)| Call Trace: 2199383.084084 ( 0.004871)| [] dump_stack+0x49/0x62 2199383.087283 ( 0.003199)| [] ? kmalloc_slab+0x2f/0x89 2199383.091415 ( 0.004132)| [] warn_slowpath_common+0x77/0x92 2199383.095197 ( 0.003782)| [] warn_slowpath_null+0x15/0x17 2199383.103336 ( 0.008139)| [] kmalloc_slab+0x2f/0x89 2199383.107082 ( 0.003746)| [] __kmalloc+0x13/0x16a 2199383.112531 ( 0.005449)| [] lpfc_pci_probe_one_s4+0x105b/0x1644 [lpfc] 2199383.115316 ( 0.002785)| [] ? pci_bus_read_config_dword+0x75/0x87 2199383.123431 ( 0.008115)| [] lpfc_pci_probe_one+0x5d/0xcb5 [lpfc] 2199383.127364 ( 0.003933)| [] ? dbs_check_cpu+0x168/0x177 2199383.136438 ( 0.009074)| [] ? gov_queue_work+0xb4/0xc0 2199383.140407 ( 0.003969)| [] local_pci_probe+0x1e/0x52 2199383.143105 ( 0.002698)| [] work_for_cpu_fn+0x13/0x1b 2199383.147315 ( 0.004210)| [] process_one_work+0x222/0x35e 2199383.151379 ( 0.004064)| [] worker_thread+0x3d5/0x46e 2199383.159402 ( 0.008023)| [] ? process_one_work+0x35e/0x35e 2199383.163097 ( 0.003695)| [] kthread+0xc8/0xd2 2199383.167476 ( 0.004379)| [] ? kthread_freezable_should_stop+0x5b/0x5b 2199383.176434 ( 0.008958)| [] ret_from_fork+0x7c/0xb0 2199383.180086 ( 0.003652)| [] ? kthread_freezable_should_stop+0x5b/0x5b 2199383.192333 ( 0.012247)| ehci-pci 0000:00:1a.0: EHCI Host Controller -------------------------------------------------------------------->8 The proposed solution was approved by James Smart at Emulex and tested on a UV2 machine with 6144 cores. With the fix, the LPFC module loads with no unwanted effects on the system. Signed-off-by: Ian Mitchell Signed-off-by: Alex Thorlton Suggested-by: Robert Elliot Cc: James Smart Cc: Dick Kennedy Cc: James E.J. Bottomley Cc: linux-scsi@vger.kernel.org Reviewed-By: James Smart --- drivers/scsi/lpfc/lpfc_init.c | 5 +---- drivers/scsi/lpfc/lpfc_sli4.h | 1 - 2 files changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index e8c8c1e..66844b3 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -8764,11 +8764,8 @@ found: first_cpu = cpu; /* Now affinitize to the selected CPU */ - mask = &cpup->maskbits; - cpumask_clear(mask); - cpumask_set_cpu(cpu, mask); i = irq_set_affinity_hint(phba->sli4_hba.msix_entries[idx]. - vector, mask); + vector, get_cpu_mask(cpu)); lpfc_printf_log(phba, KERN_INFO, LOG_INIT, "3330 Set Affinity: CPU %d channel %d " diff --git a/drivers/scsi/lpfc/lpfc_sli4.h b/drivers/scsi/lpfc/lpfc_sli4.h index 6eca3b8..bdde2c6 100644 --- a/drivers/scsi/lpfc/lpfc_sli4.h +++ b/drivers/scsi/lpfc/lpfc_sli4.h @@ -454,7 +454,6 @@ struct lpfc_vector_map_info { uint16_t core_id; uint16_t irq; uint16_t channel_id; - struct cpumask maskbits; }; #define LPFC_VECTOR_MAP_EMPTY 0xffff