[Qemu-devel] Re: Extending virtio_console to support multiple ports

Jamie Lokier jamie at shareable.org
Sat Aug 29 11:15:17 EST 2009

Alan Cox wrote:
> >  - Then, are we certain that there's no case where the tty layer will
> > call us with some lock held or in an atomic context ? To be honest,
> > I've totally lost track of the locking rules in tty land lately so it
> > might well be ok, but something to verify.
> Some of the less well behaved line disciplines do this and always have
> done.

I had a backtrace in my kernel log recently which looked like that,
while doing PPP over Bluetooth RFCOMM.  Resulted in AppArmor
complaining that it's hook was being called in irq context.

-- Jamie

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