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c533c4bf96
Since `service_level_controller` outlives `auth_integration`, it may
happen that we try to access it when it has already been deinitialized.
To prevent that, we only try to reload or clear the effective service
level cache when the object is still alive.
These changes solve an existing problem with an invalid memory access.
For more context, see issue scylladb/scylladb#24792.
We provide a reproducer test that consistently fails before these
changes but passes after them.
Fixes scylladb/scylladb#24792
(cherry picked from commit e929279d74)