issue: 4039462 XLIO crashes on thread_local stats

[AlexanderGrissik]

Description

Fixing XLIO crash with thread_local stats object

What

The thread_local objects are deallocated once the thread is finished. Depending on the configuration sockets can use a pointer to a thread_local stats object. If that thread is finished but the socket is still alive, XLIO will try to access deallocated stats object and hit seg fault.

Why ?

Crash fix

How ?

To make things straight forward we always ask if stats object exists. This should also be the most efficient. No more thread_local or global dummy object.

Change type

What kind of change does this PR introduce?

• [X] Bugfix
• [ ] Feature
• [ ] Code style update
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [ ] Documentation content changes
• [ ] Tests
• [ ] Other

Check list

• [ ] Code follows the style de facto guidelines of this project
• [ ] Comments have been inserted in hard to understand places
• [ ] Documentation has been updated (if necessary)
• [ ] Test has been added (if possible)