Greg,
Another problem with your patch is in the call to interruptible_sleep_on
in request_module.
Any signal may wake the caller before modprobe has finished and a lot will
be lost.
About zombies. The parent process (the main kmod thread) must wait for
its children.
I'm working on a fix (based on your patch) that will fix these problems
and also remove the limit on the number of request_modules served at the
same time.
Itai
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