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Re: RPC to self with rendez-vous leading to duplicate port destroy


From: Thomas Bushnell, BSG
Subject: Re: RPC to self with rendez-vous leading to duplicate port destroy
Date: Mon, 14 Mar 2011 12:56:45 -0700

On Sun, Mar 13, 2011 at 7:25 PM, Samuel Thibault <address@hidden> wrote:
address@hidden, le Mon 14 Mar 2011 03:21:43 +0100, a écrit :
> >   There, the
> >   rendez-vous port is thus the same as the reply port obtained above,
> >   with the *same name*.
> > - reauth() destroys the rendez-vous port (and thus the name!)
> >   - a bit later, diskfs_S_io_reauthenticate has finished its work,
> >     and deallocates its rendez-vous port. But the name doesn't exist any
> >     more. Bad.
>
> I wonder, why is the rendez-vous port actually destroyed, instead of
> just unreferencing the right?

(using mach_port_deallocate instead of mach_port_destroy indeed seems
to fix the issue, but there may be reasons for destroy rather than
deallocate?)

mach_port_destroy : mach_port_deallocate :: exit : free

 

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