Re: pcieport AER error spam on Intel Skylake

From: Daniel Drake
Date: Thu Sep 03 2015 - 09:32:57 EST

On Wed, Sep 2, 2015 at 7:57 PM, Alexander Duyck
<alexander.duyck@xxxxxxxxx> wrote:
> Since it is correctable errors it is likely some sort of signalling issue.
> Could we get the output of something like an lspci -vt? Then you would be
> able to tell what the device is on the other side of the link from 00:1c.5
> and then we could probably check to see if there has been any changes for
> the device driver on the other end of the link.

"lspci -vt" reliably causes one occurance of the message, which is
logged by the kernel before lspci has written anything to stdout.
pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5
pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected,
type=Physical Layer, id=00e5(Receiver ID)
pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000
pcieport 0000:00:1c.5: [ 0] Receiver Error

-[0000:00]-+-00.0 Intel Corporation Device 1904
+-02.0 Intel Corporation Device 1916
+-04.0 Intel Corporation Device 1903
+-08.0 Intel Corporation Device 1911
+-14.0 Intel Corporation Device 9d2f
+-14.2 Intel Corporation Device 9d31
+-15.0 Intel Corporation Device 9d60
+-15.1 Intel Corporation Device 9d61
+-16.0 Intel Corporation Device 9d3a
+-17.0 Intel Corporation Device 9d03
+-1c.4-[02]----00.0 Realtek Semiconductor Co., Ltd.
RTL8111/8168 PCI Express Gigabit Ethernet controller
+-1c.5-[03]----00.0 Realtek Semiconductor Co., Ltd. Device b723
+-1f.0 Intel Corporation Device 9d48
+-1f.2 Intel Corporation Device 9d21
+-1f.3 Intel Corporation Device 9d70
\-1f.4 Intel Corporation Device 9d23

Does this mean these messages are somehow related to the Realtek b723
device? That is the wifi card.
Using x86_64_defconfig there is not even any driver loaded for this
device, yet the messages appear quite a bit.
If I use a full config with all the relevant drivers including
rtlwifi, the frequency of these messages goes up a lot though.

> My suspicion since this is a laptop is that something like a power
> management change might be responsible if this is a regression as I have
> seen messages like this pop up as a result of ASPM being enabled before.

It's likely not a regression, this is brand new hardware and this
message is seen on all kernels that we have tried (4.1, 4.2, master).
pcie_aspm=off also makes these messages go away.

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