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`>.
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
_______________________________________________
lttng-dev mailing list
lttng-dev@lists.lttng.org
https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
