linux-kernel - Re: Unhandled fault: imprecise external abort (0x1406) at 0x00000000

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Date:   Mon, 10 May 2021 16:22:32 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     linux-usb@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org
Cc:     peter.chen@...nel.org, jackp@...eaurora.org,
        NXP Linux Team <linux-imx@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        mathias.nyman@...el.com, Li Jun <jun.li@....com>
Subject: Re: Unhandled fault: imprecise external abort (0x1406) at 0x00000000
 - PC is at xhci_hub_control

On Mon, 10 May 2021 at 16:02, Naresh Kamboju <naresh.kamboju@...aro.org> 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.

- Naresh