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RaspbianUser1
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CPU1: fail to come online

Mon Jul 20, 2020 4:03 pm

Erm bit of a weird one here,

My Pi has started to produce an error at boot which says that CPU1 has failed to come online, I have looked it up and there are others experiencing this after updating which I have just done

if I do the command

Code: Select all

cat /sys/devices/system/cpu/online 
0,2-3
indicating that core 1 isn't running, however I have been rebooting and about 50% of the time it runs normal and that command outputs "0-3"

I will test a different SD card if no one has any ideas, I am overclocked and that could be an issue but I have never seen this before
Running either Raspberry Pi OS desktop Full or Raspberry Pi OS MATE desktop
Overclocked at 2200MHz CPU and 700 MHz GPU with a over voltage of 7
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RaspbianUser1
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Re: CPU1: fail to come online

Mon Jul 20, 2020 4:14 pm

So because of a simple update I lose 1/4 of my CPU
Will I get this back and if so how long will it take (I know your probably not a dev, this question is to anyone who updates the firmware)

Sorry for getting a worried tone, just seems worrying when I get a message "YOUR CPU BROKEN", I joke and go off track
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trejan
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Re: CPU1: fail to come online

Mon Jul 20, 2020 4:26 pm

RaspbianUser1 wrote:
Mon Jul 20, 2020 4:14 pm
So because of a simple update I lose 1/4 of my CPU
Whilst it was applied as a "simple" update, it was a major Linux kernel change with many subsystems being upgraded or altered.
RaspbianUser1 wrote:
Mon Jul 20, 2020 4:14 pm
Will I get this back and if so how long will it take (I know your probably not a dev, this question is to anyone who updates the firmware)
It will be fixed but there is no set timescale for this. They may find the issue today or next few days. It'll be fixed when it is fixed. Pestering the Pi devs for status updates will only delay it.

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Re: CPU1: fail to come online

Mon Jul 20, 2020 5:07 pm

trejan wrote:
Mon Jul 20, 2020 4:26 pm
RaspbianUser1 wrote:
Mon Jul 20, 2020 4:14 pm
So because of a simple update I lose 1/4 of my CPU
Whilst it was applied as a "simple" update, it was a major Linux kernel change with many subsystems being upgraded or altered.
RaspbianUser1 wrote:
Mon Jul 20, 2020 4:14 pm
Will I get this back and if so how long will it take (I know your probably not a dev, this question is to anyone who updates the firmware)
It will be fixed but there is no set timescale for this. They may find the issue today or next few days. It'll be fixed when it is fixed. Pestering the Pi devs for status updates will only delay it.
Wasn’t trying to pester, but I understand your reasoning
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Re: CPU1: fail to come online

Mon Jul 20, 2020 5:50 pm

RaspbianUser1 wrote:
Mon Jul 20, 2020 5:07 pm
Wasn’t trying to pester, but I understand your reasoning
Probably unrelated, but...

I've noticed ~ 2'c increase in temperature since updating this morning, not a concern in itself, as Data would say "working within normal parameters" but have you tried without overclocking?
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RaspbianUser1
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Re: CPU1: fail to come online

Mon Jul 20, 2020 6:15 pm

I have noticed the pi getting slightly hotter which gets hot enough to turn my pi fan on when doing normal activities
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emma1997
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Re: CPU1: fail to come online

Mon Jul 20, 2020 6:25 pm

Moral of the story. Do NOT update w/o making a copy of current card. I make at least a half dozen each time having learned my lesson before and also having streamlined it down to seconds vs minutes or hours.

cleverca22
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Re: CPU1: fail to come online

Mon Jul 20, 2020 6:28 pm

emma1997 wrote:
Mon Jul 20, 2020 6:25 pm
Moral of the story. Do NOT update w/o making a copy of current card. I make at least a half dozen each time having learned my lesson before and also having streamlined it down to seconds vs minutes or hours.
and thats exactly why i choose to run www.nixos.org, the distro makes undoing any update trivial, without needing constant backups

but it does have a rather steep learning curve, and no pre-built 32bit arm binaries

bjtheone
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Re: CPU1: fail to come online

Mon Jul 20, 2020 6:56 pm

Or take the middle road of some backups and not jumping on big updates that you don't desperately need. If you update interactively and look at stuff anything with a big kernel change is an automatic "heck no, let others go bravely into the great unknown" for a week or so, before making the jump.

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dickon
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Re: CPU1: fail to come online

Mon Jul 20, 2020 7:16 pm

Or network boot, and just roll back the filesystem if you subsequently find a problem...

Lots of solutions, but yeah.

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Re: CPU1: fail to come online

Mon Jul 20, 2020 8:20 pm

Obviously there are going to be bugs but it seems like a big bug which has been willingly released as the github issue was brought up 3 days ago and the update has been pushed through knowing it has a bug
Running either Raspberry Pi OS desktop Full or Raspberry Pi OS MATE desktop
Overclocked at 2200MHz CPU and 700 MHz GPU with a over voltage of 7
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Re: CPU1: fail to come online

Mon Jul 20, 2020 9:47 pm

RaspbianUser1 wrote:
Mon Jul 20, 2020 8:20 pm
Obviously there are going to be bugs but it seems like a big bug which has been willingly released as the github issue was brought up 3 days ago and the update has been pushed through knowing it has a bug
All software is released with bugs. Looks like we can occasionally replicate this one, so at least we can do some debugging on it - that will be done as a matter of urgency. These 'marginal' issues where most Pi's work fine are the worst to narrow down. I'm sure it'll be fixed soon. Meanwhile, you'll get by on three. Or you can probably revert to an earlier kernel, but I don't know the runes for that.

Also, the release to 5.4 was before this bug was reported (Friday AIUI) - it's just takes time to propagate through the release system. I doubt we would have released had the bug been reported before.
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Re: CPU1: fail to come online

Mon Jul 20, 2020 10:00 pm

jamesh wrote:
Mon Jul 20, 2020 9:47 pm
RaspbianUser1 wrote:
Mon Jul 20, 2020 8:20 pm
Obviously there are going to be bugs but it seems like a big bug which has been willingly released as the github issue was brought up 3 days ago and the update has been pushed through knowing it has a bug
All software is released with bugs. Looks like we can occasionally replicate this one, so at least we can do some debugging on it - that will be done as a matter of urgency. These 'marginal' issues where most Pi's work fine are the worst to narrow down. I'm sure it'll be fixed soon. Meanwhile, you'll get by on three. Or you can probably revert to an earlier kernel, but I don't know the runes for that.

Also, the release to 5.4 was before this bug was reported (Friday AIUI) - it's just takes time to propagate through the release system. I doubt we would have released had the bug been reported before.
Thanks for the reply, gives me a good mindset about it, I only happens about 50% of the time so I can run the command to view how many cores are running and reboot accordingly
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Re: CPU1: fail to come online

Mon Jul 20, 2020 10:08 pm

jamesh wrote:
Mon Jul 20, 2020 9:47 pm
Or you can probably revert to an earlier kernel, but I don't know the runes for that.
Easiest route back to 4.19.118 is sudo rpi-update e1050e94821a70b2e4c72b318d6c6c968552e9a2.
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Re: CPU1: fail to come online

Mon Jul 20, 2020 10:53 pm

DougieLawson wrote:
Mon Jul 20, 2020 10:08 pm
jamesh wrote:
Mon Jul 20, 2020 9:47 pm
Or you can probably revert to an earlier kernel, but I don't know the runes for that.
Easiest route back to 4.19.118 is sudo rpi-update e1050e94821a70b2e4c72b318d6c6c968552e9a2.
Thanks for your assistance but I wont risk and i will wait for a correct update as I like to update often
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Re: CPU1: fail to come online

Tue Jul 21, 2020 12:53 am

RaspbianUser1 wrote:
Mon Jul 20, 2020 10:53 pm
… as I like to update often
Why? rpi-update hasn't been a thing that most users need to run for ages. I think I last ran it in 2014. Sure, you might need it to get early access to the fancy boot features, but you also get things like knocking out ¼ of your CPU.
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Re: CPU1: fail to come online

Tue Jul 21, 2020 12:57 am

scruss wrote:
Tue Jul 21, 2020 12:53 am
Why? rpi-update hasn't been a thing that most users need to run for ages. I think I last ran it in 2014. Sure, you might need it to get early access to the fancy boot features, but you also get things like knocking out ¼ of your CPU.
Whilst I agree that rpi-update shouldn't be used unless there is a specific reason, this CPU core was temporarily misplaced due to a stable kernel update that came via apt.

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Re: CPU1: fail to come online

Tue Jul 21, 2020 1:27 am

Sorry, I didn’t mean i run rpi-update, I have never used it
I like to update with apt full-upgrade
Surely if I revert I either wont get future updates or it will just update back to the new broken kernel (for me)
Running either Raspberry Pi OS desktop Full or Raspberry Pi OS MATE desktop
Overclocked at 2200MHz CPU and 700 MHz GPU with a over voltage of 7
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trejan
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Re: CPU1: fail to come online

Tue Jul 21, 2020 1:34 am

RaspbianUser1 wrote:
Tue Jul 21, 2020 1:27 am
Surely if I revert I either wont get future updates or it will just update back to the new broken kernel (for me)
If you revert using rpi-update then it'll stay on 4.19 until the next time there is an update published to the repo.

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Re: CPU1: fail to come online

Tue Jul 21, 2020 1:57 am

trejan wrote:
Tue Jul 21, 2020 1:34 am
RaspbianUser1 wrote:
Tue Jul 21, 2020 1:27 am
Surely if I revert I either wont get future updates or it will just update back to the new broken kernel (for me)
If you revert using rpi-update then it'll stay on 4.19 until the next time there is an update published to the repo.
Ok thanks for the knowledge, have a backed up card and I will try later
Running either Raspberry Pi OS desktop Full or Raspberry Pi OS MATE desktop
Overclocked at 2200MHz CPU and 700 MHz GPU with a over voltage of 7
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Re: CPU1: fail to come online

Tue Jul 21, 2020 8:51 am

wildfire wrote:
Mon Jul 20, 2020 5:50 pm
I've noticed ~ 2'c increase in temperature since updating this morning, not a concern in itself
False alarm, temperature is back to the way it was before, it must have been a slight rise in ambient temperature.
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JovianPyx
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Re: CPU1: fail to come online

Tue Jul 21, 2020 2:52 pm

I too have seen the missing CPU1. After a reboot, all 4 were there. I just rebooted again and all 4 are there. Being low power systems, I leave them on 24/7 so this is inconvenient, but not serious.

Thanks for the thread, at least I know the pi hardware is fine.

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Re: CPU1: fail to come online

Tue Jul 21, 2020 3:01 pm

We are looking at this with some urgency.
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Re: CPU1: fail to come online

Tue Jul 21, 2020 3:10 pm

jamesh wrote:
Tue Jul 21, 2020 3:01 pm
We are looking at this with some urgency.
Good to know!

I have got it back to normal by underclocking and then overclocking I feel as I haven't had it happen it quite a few power cycles and reboots
Running either Raspberry Pi OS desktop Full or Raspberry Pi OS MATE desktop
Overclocked at 2200MHz CPU and 700 MHz GPU with a over voltage of 7
Think before you delete something a stranger on the internet told you to.

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