Hello Kienan, I've continued investigating my issue and discovered something new that might shed some light. Here's the rundown:
1. To ensure my add-ons weren't causing problems, deleted all old modules and I followed the documentation on the LTTng website ( https://lttng.org/docs/v2.13/#doc-building-from-source) and downloaded `lttng-modules-2.13.13`. 2. Inside the downloaded folder, I successfully executed `make KERNELDIR=/usr/src/linux-source-6.5.0` without any issues. 3. Subsequently, I ran `make KERNELDIR=/usr/src/linux-source-6.5.0 modules_install`, which also completed successfully. 4. After that, I updated the module dependencies using `sudo depmod -a`, which went fine. However, when I tried to load a module, such as `sudo modprobe lttng-probe-kvm`, it reported that the module couldn't be found at `/lib/modules/6.5.0-41-generic/`. Upon checking the logs, I confirmed that step 3 had installed the modules in `/lib/modules/6.5.0/`. To address this, I modified step 3 to simply `make modules_install`, which then installed the modules correctly at `/lib/modules/6.5.0-41-generic/` and ran again step 4. But now, when attempting to load a module, I'm encountering the error `modprobe: ERROR: could not insert 'lttng_probe_kvm': Exec format error`. Do you have any insights or ideas on what might be causing this issue? Thanks again for your assistance. Le mar. 16 juill. 2024, à 09 h 05, Kienan Stewart <kstew...@efficios.com> a écrit : > Hi François, > > On 7/15/24 6:10 PM, François Belias via lttng-dev wrote: > > Hello, > > > > I'm currently running Linux kernel version 6.5.0-41-generic and > > attempting to install LTTng from source. Here are the steps I followed: > > > > - I cloned the LTTng git repository to my computer from > > [ > https://github.com/lttng/lttng-modules.git](https://github.com/lttng/lttng-modules.git) > < > https://github.com/lttng/lttng-modules.git](https://github.com/lttng/lttng-modules.git) > >. > > - Downloaded the kernel source tree corresponding to my kernel version > > to enable compilation. > > - Executed `make KERNELDIR=/path/to/my/linux/source`, which was > > completed successfully. > > - Ran `make KERNELDIR=/path/to/my/linux/source modules_install`, also > > without any issues. > > - Finally, I executed `sudo depmod -a`, which was completed successfully. > > > > However, when I attempt to load a module with commands like `sudo > > modprobe lttng-ketprobes` or "sudo modprobe lttng-tracer", I encounter > > the following errors: > > > > - For `lttng-ketprobes`: `modprobe: FATAL: Module lttng-ketprobes not > > found in directory /lib/modules/6.5.0-41-generic`. > > - For `lttng-tracer`: `modprobe: ERROR: could not insert 'lttng_tracer': > > Exec format error`. > > If you rebuilt modules on the master branch as of yesterday you may need > to clean the LTTng modules install directory, rebuild, and reinstall. > > This is due to kprobes, kretprobes, and uprobes modules being included > in the tracer core module. C.f. > > https://github.com/lttng/lttng-modules/commit/0c2c6606eb66cb5222ab7a2a4f8329fd5dfdef70 > > You may want to stick with running lttng-modules 2.13.x which will not > have breaking changes merged in. > > The exec format error also could be due to modules that are installed > but built against a different version of the Linux kernel. > > A few things to check > > - If your kernel has been upgraded recently, ensure the new kernel is > the one actually running > - If the modules haven't been rebuilt since the upgrade, they should be > rebuilt and reinstalled > - As I recall, you are playing around with some addon modules - do any > of those modules define dependencies on the kprobes, kretprobes, or > uprobes modules which now are no longer produced by builds of the master > branch > > Is there further information in dmesg or journalctl regarding the module > loading? > > hope this helps. > > thanks, > kienan > > > > > I've confirmed that the modules exist but can't load them. I'm unsure > > how to resolve these issues. Could someone please assist me? > > > > Thank you. > > > > _______________________________________________ > > lttng-dev mailing list > > lttng-dev@lists.lttng.org > > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev >
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