Bug 655139 - HP DL320G6 unresponsive when Vt-d enabled
Summary: HP DL320G6 unresponsive when Vt-d enabled
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 14
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: David Woodhouse
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2010-11-19 17:41 UTC by Gerd v. Egidy
Modified: 2012-08-16 18:05 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2012-08-16 18:05:20 UTC
Type: ---

Attachments (Terms of Use)
Screenshot showing the error messages (67.20 KB, image/png)
2010-11-19 17:41 UTC, Gerd v. Egidy
no flags Details
dmesg without vt-d (68.43 KB, text/plain)
2010-11-19 17:46 UTC, Gerd v. Egidy
no flags Details
lspci -vvv -nn (62.12 KB, text/plain)
2010-11-19 17:46 UTC, Gerd v. Egidy
no flags Details

Description Gerd v. Egidy 2010-11-19 17:41:43 UTC
Created attachment 461610 [details]
Screenshot showing the error messages

Description of problem:

The system becomes unresponsive a few seconds after boot. On the console I get messages as in the attached screenshot. The system still responds to ping, but e.g. logging in locally or via ssh is not possible anymore. I guess all disk access is stalled.

The only workarounds I've found are
1) disable vt-d in bios
2) pass "intel_iommu=off" kernel paramenter

But this way I can't use vt-d anymore which I plan to use.

The problem also appears when installing Fedora, here the installer hangs with the same messages.

The kernel I've tried this with is but the problem also appears with some 2.6.34 releases I compiled myself earlier.

The machine is a HP DL320 G6 with one Xeon E5520. The chipset is from the Intel 5500 series. This combination should allow for vt-d.

The BIOS is version W07 (10/16/2010) which is as of today the newest version posted on HP's website.

How reproducible:

Steps to Reproduce:
1. boot with vt-d enabled
2. wait till login prompt appears
3. wait about 10 seconds
4. try to log in or some other action which requires disk access
Actual results:
no login possible, no response exept the DMAR error messages as in screenshot

Expected results:
login possible

I have attached the screenshot, lspci and dmesg. The dmesg is from a boot with intel_iommu=off as due to the bug I can't save one when vt-d is enabled.

Comment 1 Gerd v. Egidy 2010-11-19 17:46:13 UTC
Created attachment 461612 [details]
dmesg without vt-d

Comment 2 Gerd v. Egidy 2010-11-19 17:46:49 UTC
Created attachment 461613 [details]
lspci -vvv -nn

Comment 3 Fedora End Of Life 2012-08-16 18:05:23 UTC
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