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[SOLVED] What do these kernel messages in dmesg mean?

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yaslam
n00b
n00b

Joined: 08 May 2024
Posts: 41

Posted: Sun Apr 27, 2025 5:04 pm Post subject: [SOLVED] What do these kernel messages in dmesg mean?

Hi everyone. I am using Gentoo with a manually configured kernel. I get these errors at boot, they don't seem to impact usage of the system. But what do these messages mean and how can I get rid of them? Perhaps a kernel option that needs to be turned on?

I searched for these messages on the internet and found a few forum posts on the Arch Linux and Ubuntu forums but they don't explain what they mean.

Code:

[ 2.336745] BPF: [135464] ENUM e
[ 2.336747] BPF: size=4 vlen=13
[ 2.336748] BPF:
[ 2.336749] BPF: Invalid name
[ 2.336749] BPF:
[ 2.555873] BPF: 0 type_id=107 bits_offset=1536
[ 2.556344] BPF:
[ 2.556774] BPF: Invalid name
[ 2.557243] BPF:
[ 2.558152] BPF: [135475] FUNC 1_avx_finup
[ 2.558592] BPF: type_id=135472
[ 2.558980] BPF:
[ 2.558982] BPF: Invalid name
[ 2.558983] BPF:
[ 2.700690] BPF: [135475] FUNC 1_avx_finup
[ 2.701069] BPF: type_id=135472
[ 2.701438] BPF:
[ 2.701802] BPF: Invalid name
[ 2.702095] BPF:
[ 2.788862] BPF: [135475] FUNC 1_avx_finup
[ 2.789170] BPF: type_id=135472
[ 2.789473] BPF:
[ 2.789773] BPF: Invalid name
[ 2.790077] BPF:
[ 2.862115] BPF: [135475] FUNC 1_avx_finup
[ 2.862419] BPF: type_id=135472
[ 2.862715] BPF:
[ 2.863005] BPF: Invalid name
[ 2.863292] BPF:
[ 2.928970] BPF: [135467] FUNC
[ 2.929260] BPF: type_id=850
[ 2.929542] BPF:
[ 2.929822] BPF: Invalid name
[ 2.930098] BPF:
[ 3.018932] BPF: [135467] FUNC
[ 3.019210] BPF: type_id=850
[ 3.019482] BPF:
[ 3.019754] BPF: Invalid name
[ 3.020014] BPF:
[ 3.082271] BPF: [135467] FUNC
[ 3.082517] BPF: type_id=850
[ 3.082760] BPF:
[ 3.082998] BPF: Invalid name
[ 3.083243] BPF:
[ 3.142259] BPF: [135467] FUNC
[ 3.142506] BPF: type_id=850
[ 3.142744] BPF:
[ 3.142983] BPF: Invalid name
[ 3.143218] BPF:
[ 3.202309] BPF: [135472] FUNC 512_avx_update
[ 3.202545] BPF: type_id=71446
[ 3.202774] BPF:
[ 3.202999] BPF: Invalid name
[ 3.203234] BPF:
[ 3.268822] BPF: [135472] FUNC 512_avx_update
[ 3.269065] BPF: type_id=71446
[ 3.269302] BPF:
[ 3.269537] BPF: Invalid name
[ 3.269762] BPF:
[ 3.328857] BPF: [135472] FUNC 512_avx_update
[ 3.329099] BPF: type_id=71446
[ 3.329336] BPF:
[ 3.329571] BPF: Invalid name
[ 3.329798] BPF:
[ 3.398709] BPF: [135479] FUNC
[ 3.398943] BPF: type_id=121
[ 3.399174] BPF:
[ 3.399402] BPF: Invalid name
[ 3.399628] BPF:
[ 3.495404] BPF: [135472] FUNC
[ 3.495634] BPF: type_id=123
[ 3.495860] BPF:
[ 3.496079] BPF: Invalid name
[ 3.496307] BPF:

Thanks

Last edited by yaslam on Mon Apr 28, 2025 8:21 am; edited 1 time in total

rab0171610
Guru
Guru

Joined: 24 Dec 2022
Posts: 502

Posted: Mon Apr 28, 2025 4:28 am Post subject:

Do you have these enabled?

Code:

Symbol: DEBUG_INFO_BTF [=n]
Type : bool
Defined at lib/Kconfig.debug:377
Prompt: Generate BTF type information
Depends on: DEBUG_INFO [=y] && !DEBUG_INFO_SPLIT [=n] && !DEBUG_INFO_REDUCED [=n] && (!GCC_PLUGIN │
Location:
-> Kernel hacking
-> Compile-time checks and compiler options
(1) -> Generate BTF type information (DEBUG_INFO_BTF [=n])

Symbol: DEBUG_INFO_BTF_MODULES [=n]
Type : bool
Defined at lib/Kconfig.debug:412
Prompt: Generate BTF type information for kernel modules
Depends on: DEBUG_INFO [=y] && DEBUG_INFO_BTF [=n] && MODULES [=y] && PAHOLE_HAS_SPLIT_BTF [=y] │
Location:
-> Kernel hacking
(2) -> Compile-time checks and compiler options
-> Generate BTF type information for kernel modules (DEBUG_INFO_BTF_MODULES [=n])

Unless you intentionally enabled this, are experimenting with bpf files, eBPF programs or need BTF enabled, you can likely disable this and then rebuild the kernel and modules.
See also:
https://forums.gentoo.org/viewtopic-p-8811286.html

You are not likely to see these types of errors in most other Linux distros, especially the pre-built binary ones like Ubuntu because they likely do not have it enabled in their stock kernels:

Code:

CO-RE requires to have BTF information describing the types of the kernel in order to perform the relocations. This is usually provided by the kernel itself when it's configured with CONFIG_DEBUG_INFO_BTF. However, this configuration is not enabled in all the distributions and it is not available on older kernels.

It's possible to use CO-RE in kernels without CONFIG_DEBUG_INFO_BTF support by providing the BTF information from an external source. BTFHUB contains BTF files to each released kernel not supporting BTF, for the most popular distributions.

https://github.com/aquasecurity/btfhub/blob/main/docs/btfgen-internals.md
https://github.com/aquasecurity/btfhub/

If you like the boring technicals:

https://www.kernel.org/doc/html/v6.1/bpf/verifier.html
https://docs.kernel.org/bpf/btf.html
https://docs.kernel.org/bpf/libbpf/libbpf_overview.html

Removed 'sid' from an URL. —Chiitoo

yaslam
n00b
n00b

Joined: 08 May 2024
Posts: 41

Posted: Mon Apr 28, 2025 8:08 am Post subject:

rab0171610 wrote:

Do you have these enabled?

Code:

Indeed! I had both of those options enabled. Disabling them got rid of the messages. Thanks!

rab0171610 wrote:

You are not likely to see these types of errors in most other Linux distros, especially the pre-built binary ones like Ubuntu because they likely do not have it enabled in their stock kernels:

Code:

Thank you! That is very helpful.

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