On Mon, 22 Apr 2002, Matthew Dharm wrote:
> The question then becomes one of how do I distinguish a race condition from
> a legitimate load/unload cycle?
> Isn't the problem here just the misuse of rmmod -a? Perhaps we should
> attach a warning to the documentation to indicate the possible badness that
> can happen.
Not really. _Any_ use of rmmod -a (i.e. unload stuff not in use) can
trigger that.
As for legitimate load/unload cycle... in this situation thing should be
considered busy. It's that simple - what happens here is that we are asking
for module because we want to make it busy as soon as we get it. Race
window is between the sys_create_module() from modprobe and try_inc_use_count()
in whatever wants it in the kernel or sys_init_module() for module depending
on it.
IOW, unload is _not_ legitimate here.
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This archive was generated by hypermail 2b29 : Tue Apr 23 2002 - 22:00:34 EST