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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 9 Nov 2021 09:29:51 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     "Bao, Joseph" <joseph.bao@...el.com>
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

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