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Interesting enough everything seemed fine on our new(er) hardware until I started optimizing BIOS settings for our workload. Using HPE's document to optimize for low latency recommends disabling a few features that caused these kernel panics for me. The relevant settings are: Intel...

Thanks Alwin, I was not aware there was an updated BIOS. These machines however are only for testing and out of warranty so I'm unable to upgrade the BIOS, we do have newer hardware available to continue our testing so I'm in the process of upgrading the machines as we speak. Hopefully they...

I can confirm the panic and it seems to be related to PTI (page-table isolation), adding the nopti flag to the kernel command line makes the server boot again although I have not yet tested the machine extensively. Previous kernels 4.15.17 all work fine, ever since kernel 4.15.18 my machines...