Jan Kiszka wrote:
> I love KVM - not only because I'm heavily hacking on it now, also
> because it is so easy to trigger various kinds of guest issues with
> it (SMP host + threaded virtual CPUs => true SMP guest - and if you
> want to watch fancy things happen, just load one host core).
>
> Here is one I found that way:
>
> void fastcall __ipipe_sync_stage(unsigned long syncmask)
> {
> [ ... ]
> while ((mask = (ipipe_this_cpudom_var(irqpend_himask) & syncmask)) !=
> 0) {
> level = __ipipe_ffnz(mask);
>
> while ((submask = ipipe_this_cpudom_var(irqpend_lomask)[level])
> != 0) {
> rank = __ipipe_ffnz(submask);
> irq = (level << IPIPE_IRQ_ISHIFT) + rank;
>
> if (test_bit(IPIPE_LOCK_FLAG, &ipd->irqs[irq].control))
> {
> __clear_bit(rank,
> &ipipe_this_cpudom_var(irqpend_lomask)[level]);
- continue;
+ goto rpm_needs_more_neurons;
> }
>
> __clear_bit(rank,
> &ipipe_this_cpudom_var(irqpend_lomask)[level]);
>
+ rpm_needs_more_neurons:
> if (ipipe_this_cpudom_var(irqpend_lomask)[level] == 0)
> __clear_bit(level,
> &ipipe_this_cpudom_var(irqpend_himask));
> [ ... ]
>
> Who sees the deadlock? 100 points for the right answer! But be quick,
> I'm already hacking on a fix. :)
>
> Jan
>
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Adeos-main mailing list
> [email protected]
> https://mail.gna.org/listinfo/adeos-main
--
Philippe.
_______________________________________________
Adeos-main mailing list
[email protected]
https://mail.gna.org/listinfo/adeos-main
