Bug#898336: hpwdt NMI kernel crash on shutdown/reboot 4.16.5-1~bpo9+1

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From	Claudio Kuenzler <ck@claudiokuenzler.com>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#898336: hpwdt NMI kernel crash on shutdown/reboot 4.16.5-1~bpo9+1
Date	Thu, 16 Sep 2021 11:30:01 +0200
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I can confirm (somewhat) similar issues with the newest Debian 11
(Bullseye) and Kernel 5.10 on HP Proliant DL380 G7 servers. Boot does
sometimes work, then it doesn't work (with a freeze caused by NMI), leading
to a very unstable OS.

After disabling hpwdt (module blacklist), the problems were gone. I
documented the troubleshooting and solution on my blog:
https://www.claudiokuenzler.com/blog/1125/debian-11-bullseye-boot-freeze-kernel-panic-hp-proliant-dl380

Ubuntu seems to have disabled/blacklisted the hpwdt module since 2015
already: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1432837
Maybe something Debian should also consider?

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Bug#898336: hpwdt NMI kernel crash on shutdown/reboot 4.16.5-1~bpo9+1 Claudio Kuenzler <ck@claudiokuenzler.com> - 2021-09-16 11:30 +0200

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