Bug 203607 - AMD IOMMU BCM 5762 watchdog timeout under heavy traffic
Summary: AMD IOMMU BCM 5762 watchdog timeout under heavy traffic
Status: NEW
Alias: None
Product: Platform Specific/Hardware
Classification: Unclassified
Component: x86-64 (show other bugs)
Hardware: All Linux
: P1 high
Assignee: platform_x86_64@kernel-bugs.osdl.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-05-14 20:17 UTC by Elmar Melcher
Modified: 2019-05-17 21:26 UTC (History)
2 users (show)

See Also:
Kernel Version: starting 4.8-rc1 up to including 5.1.1
Tree: Mainline
Regression: No


Attachments
/var/log/messages running checkout 256e4621c21aa1bf704e1a12e643923fdb732d04 (42.60 KB, text/plain)
2019-05-14 20:17 UTC, Elmar Melcher
Details

Description Elmar Melcher 2019-05-14 20:17:10 UTC
Created attachment 282761 [details]
/var/log/messages running checkout 256e4621c21aa1bf704e1a12e643923fdb732d04

Copying a big file (300MB) over ethernet to the computer causes loss of connection for more than 8 seconds.
computer: HP EliteDesk 705 G3 (AMD cpu)
Ethernet controller: Broadcom Limited NetXtreme BCM5762 Gigabit Ethernet PCIe (rev 10) 14e4:1687 running at 1000Mb/s
Kernel bisect leads to
[256e4621c21aa1bf704e1a12e643923fdb732d04] iommu/amd: Make use of the generic IOVA allocator
as cause.
Attached /var/log/messages running checkout 256e4621c21aa1bf704e1a12e643923fdb732d04.
Problem occurs on all subsequent kernel versions tested, including 5.1.1
Comment 1 Elmar Melcher 2019-05-14 20:26:47 UTC
probably related to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1447664
Comment 2 Elmar Melcher 2019-05-17 21:26:51 UTC
Trying to revert commit 256e4621c21aa1bf704e1a12e643923fdb732d04 in version 4.8-rc1 crashed during boot with DMA error at tg3 startup (tg3 is the driver for BCM5762).
Until somebody gives me some useful input I will give up on this and use 4.4 longterm, which is not affected by this bug.

Note You need to log in before you can comment on or make changes to this bug.