linux-kernel - [4.18.7] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed

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Message-ID: <trinity-2b295c8c-de09-422c-b5e2-d6b8c1276de8-1536951407748@3c-app-gmx-bs77>
Date:   Fri, 14 Sep 2018 20:56:47 +0200
From:   "Johann Kieleich" <kieleich@....de>
To:     linux-kernel@...r.kernel.org
Subject: [4.18.7] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed

Hi,

not sure if this is the place to ask.

I'm getting a LOT of these messages:

[70679.212719] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed
[70679.508107] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed
[70679.779284] DMAR: Allocating 2048-page iova for 0000:00:14.0 failed

( 00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05) )

This happens while writing random data to an USB drive (Seagate Backup Plus 6TB).

# pv < /dev/urandom > /dev/usbdrive

The drive is new and I like to overwrite drives as a burn-in test, also as a pre-encryption wipe.

This runs fine for an hour or two (a hundred gigs), then speed drops by more than half,
'top' shows usb-storage process eating CPU, mouse pointer and keyboard get sluggish,
and then a while later, these console messages appear.

So far the only thing that has helped get things back in order (for a while)
is to reboot the machine entirely.

I've no idea where to even start tackling this problem.

Any suggestions?

Thank you