Bug 214795

Summary:	intel_iommu hangs some HPE old server
Product:	Drivers	Reporter:	YunQiang Su (syq)
Component:	IOMMU	Assignee:	drivers_iommu
Status:	NEW ---
Severity:	normal	CC:	devzero, vedran
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	5.15-rc7	Subsystem:
Regression:	No	Bisected commit-id:

Description YunQiang Su 2021-10-23 16:16:05 UTC

On my HPE ProLiant BL460c Gen9, it just hangs suddenly without any screen output, and log info.

iLO IML shows: An Unrecoverable System Error (NMI) has occurred (Service Information: 0x00000008, 0x89480000)

Other people also meet this problem:
HP ProLiant DL380G6 and DL360G7

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=995773


If I disable intel_iommu by boot time option or just disable 
     CONFIG_INTEL_IOMMU_DEFAULT_ON
the problem has gone.

Comment 1 YunQiang Su 2021-10-23 16:20:40 UTC

And another workaround is disable hpwdt.

https://www.claudiokuenzler.com/blog/1125/debian-11-bullseye-boot-freeze-kernel-panic-hp-proliant-dl380

Comment 2 Roland Kletzing 2022-01-06 23:21:24 UTC

since proxmox7 ( 5.13.19-2-pve kernel), several people reporting console freeze / installer sluggishness with hp servers ( e.g. https://forum.proxmox.com/threads/updated-to-ve-7-0-no-web-gui-dmar-errors-on-console.92022/ )

on my dl380e gen8 , console prints

[12925.378093] DMAR: DRHD: handling fault status reg 2
[12925.378158] DMAR: [INTR-REMAP] Request device [01:00.0] fault index 17 [fault reason 38] Blocked an interrupt request due to source-id verification failure

and is frozen afterards.