Plex had been in use. Audio got more and more stuttery then the system went down. Photos were being accessed at the same time, so slightly higher workload than idle?

In the syslog I see "Fix Common Problems: Error: Machine Check Events detected on your server

Nov 7 20:33:34 Slipstream root: mcelog: ERROR: AMD Processor family 23: mcelog does not support this processor. Please use the edac_mce_amd module instead.

Nov 7 20:33:34 Slipstream root: CPU is unsupported"

But... this has been running this hardware (Ryzen 3900X) for months without issue.

I see mention of a share reference which has since been rectified. Still rebooting.

Ideas?

diagnostics-20251107-2033.zip

Nov 7 20:30:52 Slipstream kernel: microcode: Current revision: 0x08701034

Nov 7 20:30:52 Slipstream kernel: microcode: Updated early from: 0x08701030

Nov 7 20:30:52 Slipstream kernel: mce: [Hardware Error]: Machine check events logged

Nov 7 20:30:52 Slipstream kernel: mce: [Hardware Error]: CPU 0: Machine Check: 0 Bank 27: baa000000002080b

Nov 7 20:30:52 Slipstream kernel: mce: [Hardware Error]: TSC 0 MISC d012000400000000 SYND 5d020002 IPID 1002e00000500

Nov 7 20:30:52 Slipstream kernel: mce: [Hardware Error]: PROCESSOR 2:870f10 TIME 1762565392 SOCKET 0 APIC 0 microcode 0

MCE happened when the OS updated the microcode on the CPU. Safe to ignore. (A BIOS update might resolve it though)

If it keeps rebooting, there's like a hardware issue, if you have multiple sticks try using the server with just one, if the same try with a different one, that will basically rule out bad RAM.

It felt like a hardware issue out of nowhere. I haven't had time to go tearing into the system, but I did put a fan on it, and it stabilized.

It hasn't rebooted since, to my knowledge. We had a wood fire on that night and it was (by all accounts) unreasonably hot in the basement where the server is. I'm going to chalk it up to heat. But since moving to my old desktop's Ryzen X570 Taichi setup, I've lost the ability to monitor temps and haven't had the time to figure out why.