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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 autolearn=unavailable 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 6458FC10F14 for ; Fri, 4 Oct 2019 00:02:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 356312086A for ; Fri, 4 Oct 2019 00:02:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732273AbfJDACa (ORCPT ); Thu, 3 Oct 2019 20:02:30 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:17984 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729684AbfJDACa (ORCPT ); Thu, 3 Oct 2019 20:02:30 -0400 Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x93NqUhx026681; Thu, 3 Oct 2019 20:02:20 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 2vdm17cdxc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Oct 2019 20:02:19 -0400 Received: from m0127361.ppops.net (m0127361.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.27/8.16.0.27) with SMTP id x93NqXN1026785; Thu, 3 Oct 2019 20:02:19 -0400 Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 2vdm17cdwf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Oct 2019 20:02:19 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id x93NxsQa031791; Fri, 4 Oct 2019 00:02:17 GMT Received: from b03cxnp07029.gho.boulder.ibm.com (b03cxnp07029.gho.boulder.ibm.com [9.17.130.16]) by ppma03dal.us.ibm.com with ESMTP id 2v9y58vcka-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 04 Oct 2019 00:02:17 +0000 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x9402GjZ49414478 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 4 Oct 2019 00:02:16 GMT Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 234B76A058; Fri, 4 Oct 2019 00:02:16 +0000 (GMT) Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B6BBC6A04F; Fri, 4 Oct 2019 00:02:15 +0000 (GMT) Received: from [9.53.179.215] (unknown [9.53.179.215]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Fri, 4 Oct 2019 00:02:15 +0000 (GMT) Subject: Re: [v1] e1000e: EEH on e1000e adapter detects io perm failure can trigger crash From: "David Z. Dai" To: Alexander Duyck Cc: Jeff Kirsher , David Miller , intel-wired-lan , Netdev , LKML , zdai@us.ibm.com In-Reply-To: References: <1570121672-12172-1-git-send-email-zdai@linux.vnet.ibm.com> <1570128658.1250.8.camel@oc5348122405> Content-Type: text/plain; charset="UTF-8" Date: Thu, 03 Oct 2019 19:02:15 -0500 Message-ID: <1570147335.1250.46.camel@oc5348122405> Mime-Version: 1.0 X-Mailer: Evolution 2.32.3 (2.32.3-36.el6) Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-10-03_09:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910030194 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2019-10-03 at 13:39 -0700, Alexander Duyck wrote: > On Thu, Oct 3, 2019 at 11:51 AM David Z. Dai wrote: > > > > On Thu, 2019-10-03 at 10:39 -0700, Alexander Duyck wrote: > > > On Thu, Oct 3, 2019 at 9:59 AM David Dai wrote: > > > > > > > > We see the behavior when EEH e1000e adapter detects io permanent failure, > > > > it will crash kernel with this stack: > > > > EEH: Beginning: 'error_detected(permanent failure)' > > > > EEH: PE#900000 (PCI 0115:90:00.1): Invoking e1000e->error_detected(permanent failure) > > > > EEH: PE#900000 (PCI 0115:90:00.1): e1000e driver reports: 'disconnect' > > > > EEH: PE#900000 (PCI 0115:90:00.0): Invoking e1000e->error_detected(permanent failure) > > > > EEH: PE#900000 (PCI 0115:90:00.0): e1000e driver reports: 'disconnect' > > > > EEH: Finished:'error_detected(permanent failure)' > > > > Oops: Exception in kernel mode, sig: 5 [#1] > > > > NIP [c0000000007b1be0] free_msi_irqs+0xa0/0x280 > > > > LR [c0000000007b1bd0] free_msi_irqs+0x90/0x280 > > > > Call Trace: > > > > [c0000004f491ba10] [c0000000007b1bd0] free_msi_irqs+0x90/0x280 (unreliable) > > > > [c0000004f491ba70] [c0000000007b260c] pci_disable_msi+0x13c/0x180 > > > > [c0000004f491bab0] [d0000000046381ac] e1000_remove+0x234/0x2a0 [e1000e] > > > > [c0000004f491baf0] [c000000000783cec] pci_device_remove+0x6c/0x120 > > > > [c0000004f491bb30] [c00000000088da6c] device_release_driver_internal+0x2bc/0x3f0 > > > > [c0000004f491bb80] [c00000000076f5a8] pci_stop_and_remove_bus_device+0xb8/0x110 > > > > [c0000004f491bbc0] [c00000000006e890] pci_hp_remove_devices+0x90/0x130 > > > > [c0000004f491bc50] [c00000000004ad34] eeh_handle_normal_event+0x1d4/0x660 > > > > [c0000004f491bd10] [c00000000004bf10] eeh_event_handler+0x1c0/0x1e0 > > > > [c0000004f491bdc0] [c00000000017c4ac] kthread+0x1ac/0x1c0 > > > > [c0000004f491be30] [c00000000000b75c] ret_from_kernel_thread+0x5c/0x80 > > > > > > > > Basically the e1000e irqs haven't been freed at the time eeh is trying to > > > > remove the the e1000e device. > > > > Need to make sure when e1000e_close is called to bring down the NIC, > > > > if adapter error_state is pci_channel_io_perm_failure, it should also > > > > bring down the link and free irqs. > > > > > > > > Reported-by: Morumuri Srivalli > > > > Signed-off-by: David Dai > > > > --- > > > > drivers/net/ethernet/intel/e1000e/netdev.c | 3 ++- > > > > 1 files changed, 2 insertions(+), 1 deletions(-) > > > > > > > > diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c > > > > index d7d56e4..cf618e1 100644 > > > > --- a/drivers/net/ethernet/intel/e1000e/netdev.c > > > > +++ b/drivers/net/ethernet/intel/e1000e/netdev.c > > > > @@ -4715,7 +4715,8 @@ int e1000e_close(struct net_device *netdev) > > > > > > > > pm_runtime_get_sync(&pdev->dev); > > > > > > > > - if (!test_bit(__E1000_DOWN, &adapter->state)) { > > > > + if (!test_bit(__E1000_DOWN, &adapter->state) || > > > > + (adapter->pdev->error_state == pci_channel_io_perm_failure)) { > > > > e1000e_down(adapter, true); > > > > e1000_free_irq(adapter); > > > > > > It seems like the issue is the fact that e1000_io_error_detected is > > > calling e1000e_down without the e1000_free_irq() bit. Instead of doing > > > this couldn't you simply add the following to e1000_is_slot_reset in > > > the "result = PCI_ERS_RESULT_DISCONNECT" case: > > > if (netif_running(netdev) > > > e1000_free_irq(adapter); > > > > > > Alternatively we could look at freeing and reallocating the IRQs in > > > the event of an error like we do for the e1000e_pm_freeze and > > > e1000e_pm_thaw cases. That might make more sense since we are dealing > > > with an error we might want to free and reallocate the IRQ resources > > > assigned to the device. > > > > > > Thanks. > > > > > > - Alex > > > > Thanks for the quick reply and comment! > > Looked the e1000_io_slot_reset() routine: > > err = pci_enable_device_mem(pdev); > > if (err) { > > dev_err(&pdev->dev, > > "Cannot re-enable PCI device after reset.\n"); > > result = PCI_ERS_RESULT_DISCONNECT; > > } else { > > I didn't see log message "Cannot re-enable PCI device after reset" at > > the time of crash. > > > > I can still apply the same logic in e1000_io_error_detected() routine: > > if (state == pci_channel_io_perm_failure) { > > + if (netif_running(netdev)) > > + e1000_free_irq(adapter); > > return PCI_ERS_RESULT_DISCONNECT; > > } > > Will test this once the test hardware is available again. > > Are you sure this is the path you are hitting? Things aren't adding up. > > I thought the issue was that the interface for the error handling was > calling e1000e_down() but not freeing the IRQs? In the path where you > are adding your code I don't see how the __E1000_DOWN would have been > set? > > - Alex We see the same stack every time the crash is triggered. My understanding is not that the interface for the error handling was calling e1000e_down() but not freeing IRQs. In our case, on powerpc , if injecting eeh errors to reach preset threshold value, it will be forced to be offline permanently. In e1000e_close() to bring down link, the check: "if (! test_bit(__E1000_DOWN, &adapter->state))" is false, so e1000e_down() and e1000_free_irq() are both not called. IRQs are not freed. When e1000_remove() is called, it sees IRQs are not free, hence crash the kernel. This is the reason I have the original proposed patch to add an extra check in e1000e_close(). For the 2nd change in e1000_io_error_detected() routine, I haven't tested it yet. Pardon me if causing any confusion, and Thanks for your time again! - David