Re: [Qemu-devel] [PATCH] qtest: Fix deadloop by running main loop AIO context's timers

[Fam Zheng <famz@redhat.com>]

On Mon, 01/19 10:29, Paolo Bonzini wrote:
> 
> 
> On 16/01/2015 09:01, Fam Zheng wrote:
> > qemu_clock_run_timers() only takes care of main_loop_tlg, we shouldn't
> > forget aio timer list groups.
> > 
> > Currently, the qemu_clock_deadline_ns_all (a few lines above) counts all
> > the timergroups of this clock type, including aio tlg, but we don't fire
> > them, so they are never cleared, which makes a dead loop.
> > 
> > For example, this function hangs when trying to drive throttled block
> > request queue with qtest clock_step.
> > 
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  cpus.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/cpus.c b/cpus.c
> > index 3a5323b..dd7e595 100644
> > --- a/cpus.c
> > +++ b/cpus.c
> > @@ -387,6 +387,7 @@ void qtest_clock_warp(int64_t dest)
> >          seqlock_write_unlock(&timers_state.vm_clock_seqlock);
> >  
> >          qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
> > +        timerlistgroup_run_timers(&qemu_get_aio_context()->tlg);
> 
> Good catch.  However, I think it's enough to run the QEMU_CLOCK_VIRTUAL
> events, using timerlist_run_timers.

OK, will fix!

Fam