Module Loading
The Solaris kernel can dynamic load and unload kernel modules. When FBT is
loaded and a module is dynamically loaded, FBT automatically provides new probes associated with
the new module. If a loaded module has unenabled FBT probes, the
module may be unloaded; the corresponding probes will be destroyed as the module
is unloaded. If a loaded module has enabled FBT probes, the module is considered
busy, and cannot be unloaded.