linux-kernel - RE: HW power fault defect cause system hang on kernel 5.4.y

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Date:   Thu, 11 Nov 2021 02:16:57 +0000
From:   "Bao, Joseph" <joseph.bao@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Stuart Hayes <stuart.w.hayes@...il.com>,
        Lukas Wunner <lukas@...ner.de>
Subject: RE: HW power fault defect cause system hang on kernel 5.4.y

Hi Bjorn,

Thanks for the encouragement! Stuart already helps patch the hang issue, do I still go an open a report at https://bugzilla.kernel.org? 

Regards
Joseph

-----Original Message-----
From: Bjorn Helgaas <helgaas@...nel.org> 
Sent: Tuesday, November 9, 2021 11:30 PM
To: Bao, Joseph <joseph.bao@...el.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>; linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org; Stuart Hayes <stuart.w.hayes@...il.com>; Lukas Wunner <lukas@...ner.de>
Subject: Re: HW power fault defect cause system hang on kernel 5.4.y

On Tue, Nov 09, 2021 at 07:59:59AM +0000, Bao, Joseph wrote:
> Hi Lukas/Stuart,
> Want to follow up with you whether the system hang is expected when HW 
> has a defect keeping PCI_EXP_SLTSTA_PFD always HIGH.

A system hang in response to a hardware defect like this is never the expected situation.  Worst case we should be able to work around it with a quirk.  Far better would be a generic fix that could recognize and deal with the situation even without a quirk.

But I don't know the fix yet.  I'm just responding to encourage you to keep pestering us and not give up :)  In the meantime, it might be worth opening a report at https://bugzilla.kernel.org with a description of how you trigger the problem, and attaching the complete dmesg log and "sudo lspci -vv" output.

Bjorn