Solved DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set

[soolan]

Hello

there is such an error on my server. How can I find out what is causing the problem?

On the internet it is recommended to emove the intel_iommu=on from the Linux kernel boot parameters.

Nov 21 08:40:28 soolean kernel: DMAR: DRHD: handling fault status reg 502
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: DRHD: handling fault status reg 102
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: DRHD: handling fault status reg 400
Nov 21 08:40:28 soolean kernel: DMAR: DRHD: handling fault status reg 402
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: [DMA Write] Request device [04:00.1] fault addr 791e2000 [fault reason 05] PTE Write access is not set
Nov 21 08:40:28 soolean kernel: DMAR: DRHD: handling fault status reg 700

 

[f33dm3bits]

Even Redhat solutions suggests that as an answer, so try it? If that doesn't work try updating the servers hardware firmware.

 

[soolan]

Even Redhat solutions suggests that as an answer, so try it? If that doesn't work try updating the servers hardware firmware.

how to remove the intel_iommu=on from the Linux kernel boot parameters.

when I change this, how should I intervene if the operating system does not boot when I restart the server?

 

[soolan]

I've disabled virtualisation on the server. I'll check to see if that solves the problem

edit: the problem still persists

edit2 : grubby --update-kernel=ALL --remove-args="<PARAMETER_TO_REMOVE>" the problem still persists
remove intel_iommu

 cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-4.14.35-2025.403.3.el7uek.x86_64 root=/dev/mapper/ol-root ro rd.lvm.lv=ol/root rd.lvm.lv=ol/swap rhgb quiet LANG=en_US.UTF-8

 

[f33dm3bits]

If that doesn't work try updating the servers hardware firmware.

 

[soolan]

I ran a different kernel on the operating system and the problem was resolved.