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c0ntrarian
n00b
Joined: 05 May 2020
Posts: 9
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 Posted: Fri May 29, 2020 4:31 am Post subject: Cannot modprobe KVM |
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I cannot get KVM working on my machine. I am currently running Linux 5.4.31-ck kernel. I have rebuilt the kernel several times now -- with KVM as modules and built-in. The kernel just refuses to load the kvm and kvm_intel modules every time. I don't know where else to look for help.
| Code: | ~ % sudo modprobe kvm -vv
modprobe: INFO: custom logging function 0x55cbaffb9f20 registered
insmod /lib/modules/5.4.31-ck/kernel/arch/x86/kvm/kvm.ko
modprobe: INFO: Failed to insert module '/lib/modules/5.4.31-ck/kernel/arch/x86/kvm/kvm.ko': No such file or directory
modprobe: ERROR: could not insert 'kvm': Unknown symbol in module, or unknown parameter (see dmesg)
modprobe: INFO: context 0x55cbb0c6c440 released
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| Code: | [ 32.796808] kvm: Unknown symbol user_return_notifier_unregister (err -2)
[ 32.796811] kvm: Unknown symbol preempt_notifier_inc (err -2)
[ 32.796822] kvm: Unknown symbol preempt_notifier_register (err -2)
[ 32.796836] kvm: Unknown symbol irq_bypass_unregister_consumer (err -2)
[ 32.796871] kvm: Unknown symbol user_return_notifier_register (err -2)
[ 32.796873] kvm: Unknown symbol preempt_notifier_dec (err -2)
[ 32.796878] kvm: Unknown symbol irq_bypass_register_consumer (err -2)
[ 32.796881] kvm: Unknown symbol preempt_notifier_unregister (err -2)
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Here is my .kernel config: http://dpaste.com/0S936AZ
I have ensured that VT-d is enabled in my BIOs as well. I even updated the BIOS firmware to the latest.
Any suggestions? |
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fturco
Veteran
Joined: 08 Dec 2010
Posts: 1181
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| Posted: Fri May 29, 2020 9:10 am Post subject: Re: Cannot modprobe KVM |
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Welcome to the Gentoo forums!
| c0ntrarian wrote: | | Code: | | modprobe: INFO: Failed to insert module '/lib/modules/5.4.31-ck/kernel/arch/x86/kvm/kvm.ko': No such file or directory |
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Does the /lib/modules/5.4.31-ck/kernel/arch/x86/kvm/kvm.ko file exist on your system?
Also, what does the following command return?
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c0ntrarian
n00b
Joined: 05 May 2020
Posts: 9
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| Posted: Fri May 29, 2020 5:01 pm Post subject: Re: Cannot modprobe KVM |
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| fturco wrote: | Welcome to the Gentoo forums!
| c0ntrarian wrote: | | Code: | | modprobe: INFO: Failed to insert module '/lib/modules/5.4.31-ck/kernel/arch/x86/kvm/kvm.ko': No such file or directory |
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Does the /lib/modules/5.4.31-ck/kernel/arch/x86/kvm/kvm.ko file exist on your system?
Also, what does the following command return?
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Yes, both kvm.ko and kvm-intel.ko exist in that folder.
uname shows this:
| Code: | /lib/modules/5.4.31-ck/kernel/arch/x86/kvm % uname -r
5.4.31-ck
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Anon-E-moose
Watchman
Joined: 23 May 2008
Posts: 6205
Location: Dallas area
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| Posted: Fri May 29, 2020 5:11 pm Post subject: |
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Typically you load with modprobe kvm-amd/intel and let it load kvm under it.
Edit to add: what does modinfo kvm and kvm-intel return?
_________________
UM780, 6.12 zen kernel, gcc 13, openrc, wayland |
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54782
Location: 56N 3W
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| Posted: Fri May 29, 2020 5:38 pm Post subject: |
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c0ntrarian,
| Code: | | [ 32.796808] kvm: Unknown symbol user_return_notifier_unregister (err -2) |
Unknown symbol like this usually means that your kernel and modules are not from the same kernel build.
This is easy to get when you forget to mount boot for the kernel install.
It all looks right but you get your old kernel and new modules.
Its easy to detect.
What is the date/time in That's the build date and time of the running kernel. Is it what you expected?
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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c0ntrarian
n00b
Joined: 05 May 2020
Posts: 9
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| Posted: Fri May 29, 2020 5:59 pm Post subject: |
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| NeddySeagoon wrote: | c0ntrarian,
| Code: | | [ 32.796808] kvm: Unknown symbol user_return_notifier_unregister (err -2) |
Unknown symbol like this usually means that your kernel and modules are not from the same kernel build.
This is easy to get when you forget to mount boot for the kernel install.
It all looks right but you get your old kernel and new modules.
Its easy to detect.
What is the date/time in That's the build date and time of the running kernel. Is it what you expected? |
\
May 5th which is a few weeks ago. This doesn't seem right since I make cleaned, and make'd my kernel yesterday and installed to boot. Although, I mount boot through fstab and is always mounted while I use the machine. (lsblk shows /boot mounted to partition 3) My kernel in /boot shows up as being modified on May 28th Should I manually cp my kernel to my boot partition? |
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c0ntrarian
n00b
Joined: 05 May 2020
Posts: 9
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| Posted: Fri May 29, 2020 6:20 pm Post subject: |
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| NeddySeagoon wrote: | c0ntrarian,
| Code: | | [ 32.796808] kvm: Unknown symbol user_return_notifier_unregister (err -2) |
Unknown symbol like this usually means that your kernel and modules are not from the same kernel build.
This is easy to get when you forget to mount boot for the kernel install.
It all looks right but you get your old kernel and new modules.
Its easy to detect.
What is the date/time in That's the build date and time of the running kernel. Is it what you expected? |
Solved thank you so much. My PC was mounting boot to the wrong drive after I DD'd it. Silly me. I KNEW it was something silly and obvious. |
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Hu
Administrator
Joined: 06 Mar 2007
Posts: 23055
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| Posted: Fri May 29, 2020 11:37 pm Post subject: |
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| It may be obvious now, but it is a sufficiently common mistake that long time helpers have learned to prompt requesters to check it early in the troubleshooting process. |
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