Bug: segfault on hot reload of configs in current falco master

[incertum]

When hot reloading a Falco rules file, Falco segfaults while actually reloading the config file aka at the very beginning of the (re-)init phase.

Thread 3 "falco" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffefe006c0 (LWP 119895)]
yaml_helper::load_from_file (path="../falco.yaml", this=0x390)
    at /falco/userspace/falco/yaml_helper.h:97
97			m_root = load_from_file_int(path);
Missing separate debuginfos, use: dnf debuginfo-install elfutils-libelf-0.191-2.fc39.x86_64 glibc-2.38-16.fc39.x86_64 libcap-2.48-9.fc39.x86_64 libstdc++-13.2.1-6.fc39.x86_64 sssd-client-2.9.4-1.fc39.x86_64 systemd-libs-254.10-1.fc39.x86_64 zlib-1.2.13-4.fc39.x86_64
(gdb) 

To repro just run current Falco master and then modify and save a rules file that was initially loaded.

Note: I tested it with tag 0.37.1 and there were no issues, therefore the bug was recently introduced.
@FedeDP mind helping? Thanks!

This bug is blocking the following PR: #3187

[FedeDP]

I will check it and report back, hopefully with a fix :D

[FedeDP]

/assign

[FedeDP]

So, the issue is caused by #3184 .
Digging deeper to look for a fix!

[FedeDP]

Opened the fix: #3190

[FedeDP]

Also added a test to the testing framework for hot reload: falcosecurity/testing#54