Possible dupe of lp: #1886277?
Please follow the instructions to bisect the kernel...
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https://bugs.launchpad.net/bugs/1886057
Title:
Complete System Halt on HP Proliant 380e Gen8
Same symptoms here - on a [past history] stable system.
Experienced a system lockup with linux-image-5.4.0-40-generic yesterday,
while working at an x terminal ssh'ing into a remote host. Have rolled
back to linux-image-5.4.0-39-generic now.
Completely different hardware to your spec - AMD A10