Just FYI, this bug still happens on the new Debian 12 Bookworm Alpha2,
currently Debian Testing.
Solution is the same as previously stated: Disable (blacklsit) hpwdt Kernel
module.
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
Package: src:linux
Version: 4.16.12-1~bpo9+1
Severity: important
[ OK ] Stopped Remount Root and Kernel File Systems.
[ OK ] Reached target Shutdown.
[ 1125.048758] hpwdt: Unexpected close, not stopping watchdog!
[ 1129.467546] Kernel panic - not syncing: An NMI occurred. Depending on your
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