Re: X-Gene: Unhandled fault: synchronous external abort in pci_generic_config_read32

From: Duc Dang
Date: Mon Aug 10 2015 - 15:07:49 EST

On Mon, Aug 10, 2015 at 10:42 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
> On Mon, Aug 10, 2015 at 12:16 PM, Duc Dang <dhdang@xxxxxxx> wrote:
>> On Monday, August 10, 2015, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote:
>>> On Fri, Jul 31, 2015 at 12:00 PM, Duc Dang <dhdang@xxxxxxx> wrote:
>>> > On Wed, Jul 29, 2015 at 8:55 AM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
>>> > wrote:
>>> >> On Tue, Jul 28, 2015 at 08:22:55PM -0500, Bjorn Helgaas wrote:
>>> >>> On Tue, Jul 28, 2015 at 02:50:39PM -0700, Duc Dang wrote:
>>> >>
>>> >>> > Do you have another PCIe card to try on the same reboot test on this
>>> >>> > board?
>>> >>>
>>> >>> I've seen this on at least two Mellanox cards. I'm running similar
>>> >>> tests
>>> >>> on a different type of card now.
>>> >>
>>> >> FWIW, reboot tests on two machines with Mellanox cards failed, while
>>> >> the
>>> >> same test on a machine with a different proprietary card succeeded.
>>> >
>>> > Thanks, Bjorn.
>>> >
>>> > I don't have the same Mellanox card as yours, but I will also run
>>> > similar reboot test to see if I hit the same issue with my card.
>>> Any more hints on this? Nothing has changed on my end, so of course
>>> I'm still seeing this, always on machines with Mellanox, and never on
>>> other machines. Could this be a hardware issue like a signal
>>> integrity or margin issue? I don't know where to go from here because
>>> I'm not a hardware person, and I don't know anything to do in
>>> software.
>> Hi Bjorn,
>> I tried to run similar reboot tests on 2 different Mellanox cards (Connect-X
>> family, one card has 2 10G interfaces, the other one has 1 port that
>> supports InfiniBand) with U-Boot 1.15.12 and linux 4.2-rc5 and I did not see
>> the crash that you encounterred.
>> Did you check if your Mellanox cards have latest firmware? I did see some
>> link issues on my Mellanox cards with its old firmware before.
> Good idea; I'll check that, too. Also, I just learned that these
> cards on installed with an extender card because of some space issues,
> so we're going to test again without the extender.

Hi Bjorn,

Are other cards that passed your test installed directly to the
on-board PCIe slot?
If yes, then this is a good data point and it will be useful to test
the case where
your Mellanox cards are directly installed into the on-board PCIe slot.

Duc Dang.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at