IBT breaks `kallsyms_lookup_name` address lookup

[stuxnot]

Environment

• Component: executor
• OS: NixOS 25.11
• Kernel: 6.12
• CPU: Intel Ultra 7 255H

Issue description

The kprobe-based lookup mechanism for kallsyms_lookup_name leads to a crash in the kernel module during insertion. I've found the root cause to be Indirect Branch Tracking, disabling it via ibt=off fixes this issue for me.

[OleksiiOleksenko]

Hey. Thanks for reporting the issue!

Since you've found a workaround, I'm assigning this a lower priority. This will be targeted for v2.0.1.

As for the fix, I think it's a sign that we should get rid of the lookup calls. Those were a hacky solution in the first place, and it's time to replace them with something more reliable. I'll look into this.