[lttng-dev] loading modules with modprobe
François Belias
beliasossim at gmail.com
Wed Jul 17 11:47:11 EDT 2024
Hello, Kienan
*Right. Which kernel are you actually running at this time? You can
checkusing: `uname -a`*
Linux philippe 6.5.0-41-generic #41~22.04.2-Ubuntu SMP PREEMPT_DYNAMIC Mon
Jun 3 11:32:55 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
*Since you've got a few different images and headers installed, it
ispossible to check that same info the linux-source package: `dpkg -l |grep
linux-source`.*
ii linux-source 5.15.0.116.116
all Linux kernel source with Ubuntu
patches
ii linux-source-5.15.0 5.15.0-116.126
all Linux kernel source for version 5.15.0
with Ubuntu patches
ii linux-source-6.5.0 6.5.0-44.44~22.04.1
all Linux kernel source for version 6.5.0 with
Ubuntu patches
*Could you run either `apt-cache policy` or `apt policy` and
`apt-markshowhold` in order to know which sources you have configured.*
For this part, *apt-mark showhold* gave me nothing I don't know what is
means.
I am looking at the links, but nothing seems to match my kernel version.
Thanks for your assistance.
Le mer. 17 juill. 2024, à 11 h 46, François Belias <beliasossim at gmail.com>
a écrit :
> Hello, Kienan
>
>
>
> *Right. Which kernel are you actually running at this time? You can
> checkusing: `uname -a`*
> Linux philippe 6.5.0-41-generic #41~22.04.2-Ubuntu SMP PREEMPT_DYNAMIC Mon
> Jun 3 11:32:55 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
>
>
>
> *Since you've got a few different images and headers installed, it
> ispossible to check that same info the linux-source package: `dpkg -l |grep
> linux-source`.*
> ii linux-source 5.15.0.116.116
> all Linux kernel source with Ubuntu
> patches
> ii linux-source-5.15.0 5.15.0-116.126
> all Linux kernel source for version 5.15.0
> with Ubuntu patches
> ii linux-source-6.5.0 6.5.0-44.44~22.04.1
> all Linux kernel source for version 6.5.0 with
> Ubuntu patches
>
> *Could you run either `apt-cache policy` or `apt policy` and
> `apt-markshowhold` in order to know which sources you have configured.*
> For this part, *apt-mark showhold* gave me nothing I don't know what is
> means.
>
> I am looking at the links, but nothing seems to match my kernel version.
>
> Thanks for your assistance.
>
> Le mer. 17 juill. 2024, à 10 h 55, Kienan Stewart <kstewart at efficios.com>
> a écrit :
>
>> Hi François,
>>
>> On 7/16/24 4:34 PM, François Belias wrote:
>> > Hello Kienan,
>> >
>> > When I proceed with the following steps:
>> >
>> > ```
>> > # Warning: this removes all untracked content from the lttng-modules
>> > directory
>> > cd /path/to/lttng-modules-source
>> > git clean -dxf
>> >
>> > make
>> > sudo make modules_install
>> > sudo depmod -a
>> > ```
>> >
>> > I encounter a warning in
>> > `/home/philippe/lttng-modules/src/probes/Kbuild:79` stating "File
>> > ./arch/x86/kvm/lapic.h not found. Probe 'kvm' x86-specific is disabled.
>> > Use full kernel source tree to enable it." Although everything compiles
>> > fine and I'm able to load modules, when I execute `sudo lttng list -k`,
>> > I don't see the tracepoints `kvm_entry` and `kvm_exit`, which I believe
>> > should be available. Could this be due to not using my full kernel tree
>> > during compilation?
>>
>>
>> Exactly. Those probes depend on having the full kernel source as they
>> require private headers which aren't shipped as part of the
>> `linux-headers` package.
>>
>> >
>> > Here are the answers to your questions:
>> >
>> > - *Where did `/usr/src/linux-source-6.5.0` come from?*
>> > I initially attempted `sudo apt-get update && sudo apt-get install
>> > linux-source`, but it gave me this answer */linux-source is already the
>> > newest version (5.15.0.116.116)/*`, which doesn't match my current
>> > kernel version. So, I downloaded it directly from kernel.org
>> > <http://kernel.org> using this command: `wget
>> > https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.5.tar.xz`
>> <https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.5.tar.xz>
>> > <https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.5.tar.xz`
>> <https://cdn.kernel.org/pub/linux/kernel/v6.x/linux-6.5.tar.xz>>.
>> >
>>
>> Right. Which kernel are you actually running at this time? You can check
>> using: `uname -a`
>>
>> In any case, Linux upstream 6.5 is not the same as Ubuntus's 6.5.
>>
>> > - *Which Linux distribution and version are you using?*
>> > Running `lsb_release -a` gives me:
>> > ```
>> > No LSB modules are available.
>> > Distributor ID: Ubuntu
>> > Description: Ubuntu 22.04.4 LTS
>> > Release: 22.04
>> > Codename: jammy
>> > ```
>> >
>> > - *Assuming your distribution has kernel packages, which do you have
>> > installed, and do you have the corresponding kernel headers package
>> > installed?*
>> >
>> > Running `dpkg -l | grep linux-image` shows these installed packages:
>> > ```
>> > ii linux-image-5.15.0-116-generic 5.15.0-116.126
>> > amd64 Signed kernel image generic
>> > ii linux-image-6.5.0-28-generic 6.5.0-28.29~22.04.1
>> > amd64 Signed kernel image generic
>> > ii linux-image-6.5.0-41-generic 6.5.0-41.41~22.04.2
>> > amd64 Signed kernel image generic
>> > ii linux-image-6.5.0-44-generic 6.5.0-44.44~22.04.1
>> > amd64 Signed kernel image generic
>> > ii linux-image-generic 5.15.0.116.116
>> > amd64 Generic Linux kernel image
>> > ii linux-image-generic-hwe-22.04 6.5.0.44.44~22.04.1
>> > amd64 Generic Linux kernel image
>> > ```
>> >
>> > And `dpkg -l | grep linux-headers` shows these installed header
>> packages:
>> > ```
>> > ii linux-headers-5.15.0-116 5.15.0-116.126 all
>> > Header files related to Linux kernel version 5.15.0
>> > ii linux-headers-5.15.0-116-generic 5.15.0-116.126
>> > amd64 Linux kernel headers for version 5.15.0 on 64 bit x86 SMP
>> > ii linux-headers-6.5.0-28-generic 6.5.0-28.29~22.04.1
>> > amd64 Linux kernel headers for version 6.5.0 on 64 bit x86 SMP
>> > ii linux-headers-6.5.0-41-generic 6.5.0-41.41~22.04.2
>> > amd64 Linux kernel headers for version 6.5.0 on 64 bit x86 SMP
>> > ii linux-headers-6.5.0-44-generic 6.5.0-44.44~22.04.1
>> > amd64 Linux kernel headers for version 6.5.0 on 64 bit x86 SMP
>> > ii linux-headers-generic 5.15.0.116.116
>> > amd64 Generic Linux kernel headers
>> > ii linux-headers-generic-hwe-22.04 6.5.0.44.44~22.04.1
>> > amd64 Generic Linux kernel headers
>> > ```
>> >
>>
>> Since you've got a few different images and headers installed, it is
>> possible to check that same info the linux-source package: `dpkg -l |
>> grep linux-source`.
>>
>> Maybe one thing tripping this process up is that you don't have an apt
>> source that provides linux-source that matches the kernel you are using.
>> Could you run either `apt-cache policy` or `apt policy` and `apt-mark
>> showhold` in order to know which sources you have configured.
>>
>> There are also alternative sources for the full source tree:
>>
>> - You could download the specific package from packages.ubuntu.com. See
>> https://packages.ubuntu.com and use `apt install
>> ./downloaded_package.deb`
>>
>> - You could clone the kernel source for Ubuntu and checkout the
>> appropriate tag. See
>>
>> https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/jammy/refs/tags
>>
>> thanks,
>> kienan
>>
>
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