Re: [PATCH v2] audio/jack: fix use after free segfault

[Gerd Hoffmann]

  Hi,

> > > schedule a bottom half calling qjack_client_fini()
> > 
> > Does QEMU have such a mechanism for doing this?
> 
> There could also be a possible race here if `jack_client_connect` is called
> before the scheduled shutdown takes place.

You can cancel a scheduled bottom half, and checking ->state on connect
should tell you whenever this is needed or not.  I think you can even
just cancel unconditionally (when not scheduled the cancel is a nop).

HTH,
  Gerd