Problems syncing this morning : invalid block, please help

[gabrio81]

So, this invalid block thing was happening quite often until i discovered something: I was always running my CPU with an undervolt flag for better temperature under heavy loads.

Are you doing the undervolt though software (e.g. cpupower) or are you setting a hardware setting?

Maybe you're using a hardware undervolt and so CPU cycles are being thrown away as a result without Core realizing it's being slown down. I never had any problems with underclocking with cpupower, you should look into that (but its underclock is system-wide).

No, i am using Intel Extreme Tuning Utility, so software, nothing hardware at all. Don't care as i only use it when needing extra juice and on BTC core i know what to do.

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[gabrio81]

So i am quite happy i managed to find a solution that works. I still run the undervolt for other things and some other wallets but not for BTC core.

It sounds like you've created a hardware problem by undervolting. You may not notice the problems in other applications, but they could still occur.
I'd say improve your cooling instead of using hardware outside it's specifications. For your next computer, consider a processor with lower TDP if possible.

So that's why Bitcoin Core gives a warning when started for the first time:

This initial synchronisation is very demanding, and may expose hardware problems with your computer that had previously gone unnoticed.

Love the mystery stuff, oh well - that's not the initial sync tho, it's the weekly catch-ups that had those issues. i don't use it 24/7, weekly sync usually.

Anyhow just wanted to share in case others also get stuck, disable the undervolting - and yes improving cooling is also great, in fact i have a very good Klim Coolpad when necessary now.