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Kernel 4.14 works on one VPS but not the other
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xenogamers
n00b
n00b


Joined: 02 Aug 2017
Posts: 5

PostPosted: Wed Jan 17, 2018 7:29 am    Post subject: Kernel 4.14 works on one VPS but not the other Reply with quote

So the VPS is running on kernel 4.12, and doing an upgrade of that config to 4.14, the VPS won't boot and shows this:
https://i.gyazo.com/f806f1031f02aa77ec2dd7ec78c51970.png

However, with that same config, it boots just fine on another VPS with the same hypervisor type.

I'm not sure how to debug, and has anyone experienced anything similar to this?

Thanks!
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blopsalot
Apprentice
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Joined: 28 Jan 2017
Posts: 231

PostPosted: Sun Jan 21, 2018 4:33 am    Post subject: Reply with quote

if they were truly the same, you wouldn't be having this issue, you need to figure out what's different with the hosts. if you have no control/access to the hosts, you can either start debugging or I would look at gcc plugins and other security options first.

https://wiki.gentoo.org/wiki/Kernel_Crash_Dumps
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ct85711
Veteran
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Joined: 27 Sep 2005
Posts: 1707

PostPosted: Sun Jan 21, 2018 7:16 am    Post subject: Reply with quote

From the output you posted, didn't really give a error message that is significant. The most it said, is that it detected some devices found but not in the kernel. So more likely if there was a more significant error, it was later and not shown. Otherwise a common cause for the startup seem to hang for a while, is that it is attempting to find and load some firmware but unable to find them. Assuming you are using an initrd, I'd check that to make sure it contains the necessary firmware.
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xenogamers
n00b
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Joined: 02 Aug 2017
Posts: 5

PostPosted: Sun Jan 21, 2018 9:16 am    Post subject: Reply with quote

It's odd but I found the issue.

For all the VPSes I set the /etc/default/grub to set the IO scheduler to BFQ:
GRUB_CMDLINE_LINUX_DEFAULT="elevator=bfg numa=off"

And the first one has no issues with this, but I guess commenting out that line in the other two VPSes causes it to boot just fine.

I've just made a script in /etc/local.d to set the IO scheduler from now on.
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