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Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2

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  Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2 Bernhard Schmidt <berni@debian.org> - 2026-10-01 10:30 +0200

#94300 — Bug#1149564: linux-image-6.12.111+deb13-amd64: 6.12.111-1 regression crash bnxt_en: DMAR: DRHD: handling fault status reg 2

On 30/09/26 09:57 PM, Bernhard Schmidt wrote:

> After upgrading to todays security kernel a pair of BCM57416 onboard
> ports fail after a couple of minutes uptime with the following error
> message in the log
> 
> Sep 30 21:33:27 nm3 kernel: Linux version 6.12.111+deb13-amd64 (debian-kernel@lists.debian.org) (x86_64-linux-gnu-gcc-14 (Debian 14.2.0-19) 14.2.0,
> [...]
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.0 eth0: Broadcom BCM57416 NetXtreme-E 10GBase-T Ethernet found at mem 9dc10000, node addr 00:0a:f7:e7:f0:5c
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.0: 63.008 Gb/s available PCIe bandwidth (8.0 GT/s PCIe x8 link)
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.1 (unnamed net_device) (uninitialized): Device requests max timeout of 100 seconds, may trigger hung task watchdog (kernel default 120s)
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.1 eth1: Broadcom BCM57416 NetXtreme-E 10GBase-T Ethernet found at mem 9dc00000, node addr 00:0a:f7:e7:f0:5d
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.1: 63.008 Gb/s available PCIe bandwidth (8.0 GT/s PCIe x8 link)
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.0 eno1np0: renamed from eth0
> Sep 30 21:33:27 nm3 kernel: bnxt_en 0000:19:00.1 eno2np1: renamed from eth1
> [...]
> Sep 30 21:37:42 nm3 kernel: DMAR: DRHD: handling fault status reg 2
> Sep 30 21:37:42 nm3 kernel: DMAR: [DMA Read NO_PASID] Request device [19:00.0] fault addr 0xefffc000 [fault reason 0x06] PTE Read access is not set

A friend reminded me that they were seeing the same thing after a
Proxmox kernel upgrade from 6.7.13-21-pve to 7.0.14-12 (so across major
versions). It was reported to Proxmox and a fix is not known. However,
as workaround you can set the IOMMU in Passthrough mode (iommu=pt on the
kernel commandline) which fixes the problem. This also works for 6.12.111+deb13-amd64

Bernhard

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