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CPU errors? (feddit.nl)

submitted 20 hours ago* (last edited 13 hours ago) by lemmyvore@feddit.nl to c/linux@lemmy.ml

19 comments fedilink hide all child comments

I'm trying a new CPU in my PC (Ryzen 5500GT) and I'm seeing:

Sporadic kernel panics during boot.
Random .ko.zst module files (different one each boot) complaining that ZST decompression failed checksum.
Random .so's failing to find a symbol and causing programs to crash/fail to start.
Started a stress-ng sequential session at 5s per stressor and it hung up after a dozen stressors. Couldn't ctrl-c it and also ps didn't work anymore. 😅

Funny thing is, other than that the system runs fine (when it boots, that is).

Switched back to my old CPU (that's the only change in the machine) and all of these things stopped.

That CPU that's doing that is defective, correct? Just double-checking I'm not missing anything else.

I've reset BIOS between CPU swaps and left it at defaults. Could default settings cause a CPU to act like this?

Edit: cooling is good, all temps (chipset, CPU etc.) are in the 30's C in idle, CPU went up to 75C when stressed. Have a tower cooler (Scythe Kotetsu) with a 120mm fan.

I'm also adding some voltage readings I took from sensors while the problematic CPU was installed:

Vcore: 840mV
+3.3V: 3.31V
+12.0V: 12.10V
+5.0V: 5.01V
VSOC: 780mV
VDDP: 900mV
DRAM: 1.21V
3VSB: 3.29V
VBAT: 3.26V

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[–] KnightontheSun@lemmy.world 3 points 14 hours ago (3 children)

What motherboard? What cpu did you have? Is this new Ryzen 5600 on the hardware list for the motherboard? If so, are there any voltage, stepping or other settings (listed in the manual) required to make it run stably?

Make sure the new cpu is clean with no potential shorts from anything. Also ensure good heatsink contact. If you’ve done all the normal and necessary steps then yes it might be a bad cpu, but they aren’t frequent failure items in my experience. Disagreeable conditions for the cpu is more commonly the culprit. Engineering sample cpus are the most fickle, but even some normal batch cpus might sometimes require a bit more (or less) juice or a system tweak.

[–] lemmyvore@feddit.nl 2 points 13 hours ago (2 children)

Motherboard is a Gigabyte B450 Aorus M. It's fully updated and support for this particular CPU is explicitly listed in a past revision of the mobo firmware.

Manual doesn't list any specific CPU settings but their website says stepping A0, and that's what the defaults were setting. Also I got "core speed: 400 MHz", "multiplier: x 4.0 (14-36)".

even some normal batch cpus might sometimes require a bit more (or less) juice or a system tweak

What does that involve? I wouldn't know where to begin changing voltages or other parameters. I suspect I shouldn't just faff about in the BIOS and hope for the best. :/

[–] KnightontheSun@lemmy.world 1 points 4 hours ago (1 children)

No, I would search for your motherboard model and forums to see what situations might match yours so that you might glean something useful as far as settings go. A quick check revealed nothing useful that stands out to me. Resetting all electrical connections was the lone useful tip. (The reddit link blocked me, lol. Fine) Perhaps more detailed (or different) search terms would produce better results.

I think you've taken the right steps to this point. Another CPU to test with would prove useful (though your original should suffice). Or another board to test this CPU in. Perhaps the shop you procured this one from has one or the other? Otherwise, I would pursue replacement.

[–] lemmyvore@feddit.nl 1 points 3 hours ago

Honestly I'll just send it back at this point. I have kernel panics that point to at least two of the cores being bad. Which would explain the sporadic nature of the errors. Also why memcheck ran fine because it only uses the first core by default. Too bad I haven't thought about it when running memtest because it lets you select cores explicitly.