Re: [Patch -mm 0/3] RFC: module unloading vs. release function

["Dmitry Torokhov" <dmitry.torokhov@gmail.com>]

On 4/16/07, Cornelia Huck <cornelia.huck@de.ibm.com> wrote:
> Hi,
>
> based on the discussion in "How should an exit routine wait for
> release() callbacks?", I've cooked up some patches that make module
> unload wait until the last reference for a kobject has been dropped.
> This should plug the "release function in already deleted module" race;
> however, if the last kobject_put() from the module containing the
> release function is not in the module's exit function, there's still a
> small window (not sure if and how to plug this).

Unfortunately all this "wait for refcount in module's exit" schemas
lead to the following deadlock:

       rmmod my_module < /path/to/some/file/incrementing/my/refcount

--
Dmitry
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