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

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

From: Claudio Kuenzler <ck@claudiokuenzler.com>

Date: Thu, 16 Sep 2021 11:09:34 +0200

Message-id: <[🔎] CAF-yqggnoWT6XYE20bTs1iMwRXpE+afiRDz89zoMMcJ8CUUojQ@mail.gmail.com>

Reply-to: Claudio Kuenzler <ck@claudiokuenzler.com>, 898336@bugs.debian.org

References: <1525952059.584821237@webmail.futurefoam.com>

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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