Bug#993948: kernel/amd64: system hang on HPE ProLiant BL460c Gen9
YunQiang Su <wzssyqa@gmail.com> 于2021年10月22日周五 下午10:36写道：
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> Claudio Kuenzler <ck@claudiokuenzler.com> 于2021年10月22日周五 下午2:03写道：
> >
> > The fact that a later Kernel versions work fine _could_ be because of a hpwdt commit after 5.10: https://github.com/torvalds/linux/commit/acc195bd2cc48445ea35d00036d8c0afcc4fcc9c#diff-994ee4b010b5c6222ad7a20e160f733401f46894b36fa3e1fb6ffbb48bedb817
> > I have not tested sid or a newer Kernel on our HP machines though.
> > If you've compiled your own Kernel and this one works (did your do a multiple reboot test?), maybe there's a difference in the Kernel "config"?
> >
> > What happens if you disable the hpwdt module as mentioned in the other bug reports? Does Bullseye with 5.10 and experimental with 5.14 work in this case?
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> I test upstream linux and debian-linux with the same config.
> All of the upstream config works fine, while debian-linux has this problem.
> I guess it is due to one patch by Debian.
>
I find the real problem: it is due to intel_iommu by default.
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=934309
> --
> YunQiang Su
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YunQiang Su
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