linux-kernel - Re: Fwd: [WARNING AND ERROR] may be system slow and audio and video breaking

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Date:   Mon, 19 Oct 2020 03:27:48 +0530
From:   Jeffrin Jose T <jeffrin@...agiritech.edu.in>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        jpoimboe@...hat.com, mbenes@...e.cz,
        "peterz@...radead.org" <peterz@...radead.org>,
        shile.zhang@...ux.alibaba.com, lkml <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Shuah Khan <shuah@...nel.org>
Subject: Re: Fwd: [WARNING AND ERROR]  may be  system slow and  audio and
 video breaking

On Sun, 2020-10-18 at 23:03 +0200, Borislav Petkov wrote:
> On Mon, Oct 19, 2020 at 01:51:34AM +0530, Jeffrin Jose T wrote:
> > On Sun, 2020-10-18 at 19:49 +0200, Borislav Petkov wrote:
> > > On Sun, Oct 18, 2020 at 10:42:39PM +0530, Jeffrin Jose T wrote:
> > > > smpboot: Scheduler frequency invariance went wobbly, disabling!
> > > > [ 1112.592866] unchecked MSR access error: RDMSR from 0x123 at
> > > > rIP:
> > > > 0xffffffffb5c9a184 (native_read_msr+0x4/0x30)
> 
> Ok, you forgot to say in your initial mail that this happens when you
> suspend your laptop.
> 
> Now, this unchecked MSR error thing happens only once because that
> early
> during resume the microcode on CPU1 is not updated yet - and that
> needs
> to be debugged separately and I'll try to reproduce that on my
> machine -
> so the microcode is not updated yet and therefore the 0x123 MSR is
> not
> "emulated" by the microcode, so to speak, thus the warning.
> 
> That warning doesn't happen anymore, though, once the microcode is
> updated.
> 
> But what happens after that is you get a flood of correctable PCIe
> errors about a transaction to a device timeoutting:
> 
> pcieport 0000:00:1c.5: AER: Corrected error received: 0000:00:1c.5
> pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Data
> Link Layer, (Transmitter ID)
> pcieport 0000:00:1c.5:   device [8086:9d15] error
> status/mask=00001000/00002000
> pcieport 0000:00:1c.5:    [12] Timeout 
> 
> and it looks like that flood is slowing down the machine because it
> is
> busy logging them.
> 
> Do
> 
> # lspci -nn -xxx
> 
> as root. It'll show us which device that 8086:9d15 is.
> 
> Thx.
> 

$sudo lspci -nn -xxx | grep 9d15
00:1c.5 PCI bridge [0604]: Intel Corporation Sunrise Point-LP PCI
Express Root Port #6 [8086:9d15] (rev f1)
$


file lspci.txt is attached
-- 
software engineer
rajagiri school of engineering and technology

View attachment "lspci.txt" of type "text/plain" (18007 bytes)