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=-12.1 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 17529C43463 for ; Fri, 18 Sep 2020 10:47:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D665121D24 for ; Fri, 18 Sep 2020 10:47:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726009AbgIRKrQ (ORCPT ); Fri, 18 Sep 2020 06:47:16 -0400 Received: from mga07.intel.com ([134.134.136.100]:3687 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725941AbgIRKrP (ORCPT ); Fri, 18 Sep 2020 06:47:15 -0400 IronPort-SDR: SVtUChuCLG3UJ+Wui5vbTrr8FPNv7Y/kE4LUnT5lCodTIY4tKHMpNeYOaKd9coV83DX8CQOB/Z L9xZz0Zv1zGA== X-IronPort-AV: E=McAfee;i="6000,8403,9747"; a="224076348" X-IronPort-AV: E=Sophos;i="5.77,274,1596524400"; d="scan'208";a="224076348" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Sep 2020 03:47:15 -0700 IronPort-SDR: BVmMABdD3pIz4caY6h39Gm7kFf2xpes3x9+7eLxAQHr1KvFxpQNw8kKMBnRGLtO3C9KBIfPXFQ asbaruBWfX8w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,274,1596524400"; d="scan'208";a="452703055" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by orsmga004.jf.intel.com with ESMTP; 18 Sep 2020 03:47:14 -0700 Subject: Re: xhci problem -> general protection fault To: Andrzej Pietrasiewicz , "linux-usb@vger.kernel.org" Cc: "kernel@collabora.com" References: <65ac3a73-ca57-c3e8-561b-9ba5c15b3c65@collabora.com> From: Mathias Nyman Openpgp: preference=signencrypt Autocrypt: addr=mathias.nyman@linux.intel.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <65ac3a73-ca57-c3e8-561b-9ba5c15b3c65@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On 17.9.2020 18.30, Andrzej Pietrasiewicz wrote: > Dear All, > > I have encountered a problem in xhci which leads to general protection fault. > > The problem is triggered by running this program: > > https://gitlab.collabora.com/andrzej.p/bulk-cancel.git > > $ sudo ./bulk-cancel -D /dev/bus/usb/002/006 -i 1 -b 1 > > where /dev/bus/usb/002/006 is a Gadget Zero: > > It takes less than a minute until the crash happens. > The DMAR (iommu) errors don't happen always, i.e. there are crashes > when they are not reported in the system log. In either case the > > "WARN Cannot submit Set TR Deq Ptr" > "A Set TR Deq Ptr command is pending." > "WARN Set TR Deq Ptr cmd failed due to incorrect slot or ep state." > > messages do appear. > Nice testcase and report, thanks. I started looking at issues in this area some time ago, and wrote a couple patches but it was left hanging. The two patches (now rebased on 5.9-rc3) can be found in my tree in the fix_invalid_context_at_stop_endpoint branch git://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git fix_invalid_context_at_stop_endpoint https://git.kernel.org/pub/scm/linux/kernel/git/mnyman/xhci.git/log/?h=fix_invalid_context_at_stop_endpoint If you could give those a try and see if they help I'd be grateful. also, if possible, can you add xhci dynamic debug and traces to show in more detail what is going on. mount -t debugfs none /sys/kernel/debug echo 'module xhci_hcd =p' >/sys/kernel/debug/dynamic_debug/control echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control echo 81920 > /sys/kernel/debug/tracing/buffer_size_kb echo 1 > /sys/kernel/debug/tracing/events/xhci-hcd/enable < Run the testcase > Send output of dmesg Send content of /sys/kernel/debug/tracing/trace Thanks Mathias