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[23.128.96.18]) by mx.google.com with ESMTP id b6si14914754ejb.158.2021.05.10.06.13.39; Mon, 10 May 2021 06:14:13 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351120AbhEJNC7 (ORCPT + 99 others); Mon, 10 May 2021 09:02:59 -0400 Received: from mga01.intel.com ([192.55.52.88]:14867 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348919AbhEJMrp (ORCPT ); Mon, 10 May 2021 08:47:45 -0400 IronPort-SDR: ylM7ic+Nf4AEnFt5H5yQ50+eZaZ4+076RsGUra7dW55235pKxTsrxhHPY1mlAzIf7a+LZxlDX6 WiaBQL41Zm3Q== X-IronPort-AV: E=McAfee;i="6200,9189,9979"; a="220130793" X-IronPort-AV: E=Sophos;i="5.82,287,1613462400"; d="scan'208";a="220130793" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 May 2021 05:45:39 -0700 IronPort-SDR: Q7H0TpO7rQN6/tGa1ZcOFjHwC2dxzp0YN6jjFUN+tO/EOqv2ea7XccDolUSV45mV5TjufiGsJ1 QBiNZaBT7Rig== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.82,287,1613462400"; d="scan'208";a="624268577" Received: from mattu-haswell.fi.intel.com (HELO [10.237.72.170]) ([10.237.72.170]) by fmsmga005.fm.intel.com with ESMTP; 10 May 2021 05:45:37 -0700 Subject: Re: Unhandled fault: imprecise external abort (0x1406) at 0x00000000 - PC is at xhci_hub_control To: Naresh Kamboju , linux-usb@vger.kernel.org, open list , lkft-triage@lists.linaro.org Cc: peter.chen@kernel.org, jackp@codeaurora.org, NXP Linux Team , Greg Kroah-Hartman , Alan Stern , mathias.nyman@intel.com, Li Jun References: From: Mathias Nyman Autocrypt: addr=mathias.nyman@linux.intel.com; prefer-encrypt=mutual; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10.5.2021 14.05, Naresh Kamboju wrote: > On Mon, 10 May 2021 at 16:22, Naresh Kamboju wrote: >> >> On Mon, 10 May 2021 at 16:02, Naresh Kamboju wrote: >>> >>> The kernel crash reported on arm architecture BeagleBoard-X15 device running >>> Linux next 5.13.0-rc1-next-20210510 while booting the device. >>> >>> [ 4.956085] xhci-hcd xhci-hcd.1.auto: xHCI Host Controller >>> [ 4.961639] xhci-hcd xhci-hcd.1.auto: new USB bus registered, >>> assigned bus number 2 >>> [ 4.969360] xhci-hcd xhci-hcd.1.auto: Host supports USB 3.0 SuperSpeed >>> [ 4.976165] usb usb2: We don't know the algorithms for LPM for this >>> host, disabling LPM. >>> [ 4.985321] hub 2-0:1.0: USB hub found >>> [ 4.989196] hub 2-0:1.0: 1 port detected >>> [ 5.002197] Waiting for root device >>> PARTUUID=6b10e805-12ad-b44e-88b8-3abf3d5f52ed... >>> [ 5.022918] 8<--- cut here --- >>> [ 5.026000] Unhandled fault: imprecise external abort (0x1406) at 0x00000000 >>> [ 5.033root >>> 081] pgd = ff6a1748 >>> [ 5.035797] [00000000] *pgd=00000000 >>> [ 5.039398] Internal error: : 1406 [#1] SMP ARM >>> [ 5.043975] Modules linked in: >>> [ 5.047027] CPU: 0 PID: 22 Comm: kworker/0:1 Not tainted >>> 5.13.0-rc1-next-20210510 #1 >>> [ 5.054809] Hardware name: Generic DRA74X (Flattened Device Tree) >>> [ 5.060943] Workqueue: pm pm_runtime_work >>> [ 5.065002] PC is at xhci_hub_control+0xd00/0x248c >>> [ 5.069824] LR is at arm_heavy_mb+0x44/0x48 >> >> Since, this crash is not easily reproducible I could bisect it. > > sorry, i mean i could *not* > > Since, this crash is not easily reproducible I could not bisect it. Looks like USB SS roothub is trying to runtime suspend early during boot. Any chance you could look up the source line of xhci_hub_control+0xd00/0x248c in your kernel? gdb vmlinux li *(xhci_hub_control+0xd00) Thanks -Mathias