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Bug#995773: linux-image-5.10.0-8-amd64: NMI panic on HP ProLiant DL380G6 and DL360G7

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On Wed, 6 Oct 2021 08:11:05 +0200 Claudio Kuenzler <ck@claudiokuenzler.com> wrote:
> I've seen this too and documented my findings here:
> https://www.claudiokuenzler.com/blog/1125/debian-11-bullseye-boot-freeze-kernel-panic-hp-proliant-dl380
> 
> (reason is the hpwdt module)
> 
> This bug is most likely a duplicate of
> https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=898336 where the same
> NMI's are reported with Kernel 4.16 but with Kernel 5.10 the boot
> issues/crashes seem to be even worse.
> 
> Maintainers, please consider disabling (blacklisting) the hpwdt module by
> default (same as Ubuntu). If anyone REALLY needs it, it can be manually
> enabled.


My HPE ProLiant BL460c Gen9 has the same problem.
And with some debug, I find the problem is due to
   CONFIG_INTEL_IOMMU_DEFAULT_ON=y

So, as a workaround, we can use intel_iommu=off kernel option.

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Bug#995773: linux-image-5.10.0-8-amd64: NMI panic on HP ProLiant DL380G6 and DL360G7 Claudio Kuenzler <ck@claudiokuenzler.com> - 2021-10-06 08:30 +0200
  Bug#995773: linux-image-5.10.0-8-amd64: NMI panic on HP ProLiant DL380G6 and DL360G7 Yunqiang Su <wzssyqa@gmail.com> - 2021-10-23 18:10 +0200

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