On Fri, Dec 18, 2015 at 11:30:33AM +0100, David Henningsson wrote:
> Hi Linux PCI maintainers,
>
> My dmesg gets filled with a few lines repeated over and over again:
>
> pcieport 0000:00:1c.0: AER: Corrected error received: id=00e0
> pcieport 0000:00:1c.0: can't find device of ID00e0
> pcieport 0000:00:1c.0: AER: Corrected error received: id=00e0
> pcieport 0000:00:1c.0: PCIe Bus Error: severity=Corrected,
> type=Physical Layer, id=00e0(Receiver ID)
> pcieport 0000:00:1c.0: device [8086:9d14] error
> status/mask=00000001/00002000
> pcieport 0000:00:1c.0: [ 0] Receiver Error
>
> This happens 10-30 times per second (!), so dmesg fills up quickly.
> The bug is present in both vanilla and Ubuntu kernels.
This is a pretty obvious bug in our AER code. We normally clear
correctable errors by writing the PCI_ERR_COR_STATUS register in
handle_error_source(). The execution path looks like this:
aer_isr_one_error
aer_print_port_info
if (find_source_device())
aer_process_err_devices
handle_error_source
pci_write_config_dword(dev, PCI_ERR_COR_STATUS, ...)
In this case, find_source_device() printed "can't find device of
ID00e0" [sic] and returned false, so we don't call
aer_process_err_devices(). The error is never cleared, so
we discover it again and again.
I'll work on fixing this. Incidentally, there's another report
with similar symptoms here:
https://bugzilla.kernel.org/show_bug.cgi?id=109691
Bjorn
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