dtrace vs module unloading

[George Neville-Neil]

On Jan 27, 2013, at 07:24 , Andriy Gapon <avg at FreeBSD.org> wrote:

> 
> It seems that FreeBSD DTrace currently does not track module loading / unloading
> at all.  dtrace_module_loaded/dtrace_module_unloaded are both under ifdef sun.
> 
> I think that this is a root cause of e.g. fbt probes for some functions
> remaining after a module that provides the functions is unloaded.
> 
> It looks like currently we do not post any event when a module gets loaded /
> unloaded.  Perhaps this is one of the factors in current situation.
> OTOH, in Solaris they just have some dtrace hooks in the form of function
> pointers directly in the module handling code (equivalent of our kern_linker).
> 

Hrm, sounds like a bug more than anythign else.  I don't know enough yet to say how to solve
this but if you want to track this you're welcome to create a PR and assign it to me.

Best,
George