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Re: kernel deadlock on fstchg with vnd (Taylor R Campbell) writes:

>This would need to be integrated into autoconf/specfs to avoid races
>in config_pseudo_spawn, sc->sc_configured, and config_pseudo_unspawn,

vnd is peculiar in that it spawns a unit whenever it is opened and
removes it again when it is closed.

VNDIOCSET for the same unit marks it VNF_INITED on success, and then
it persists.

VNDIOCSET for a different unit spawns that unit first and then marks

It would be simpler if there were a static dedicated control unit that
is used only for creating / purging other units.

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