Re: WW_MUTEX_SELFTEST hangs w/ 6.9-rc workqueue changes

[John Stultz]

On Fri, May 3, 2024 at 7:47 PM Tejun Heo <tj@xxxxxxxxxx> wrote:
> On Fri, May 03, 2024 at 06:01:49PM -0700, John Stultz wrote:
> > Hey All,
> >    In doing some local testing, I noticed I've started to see boot
> > stalls with CONFIG_WW_MUTEX_SELFTEST with 6.9-rc on a 64cpu qemu
> > environment.
> >
> > I've bisected the problem down to:
> >   5797b1c18919 (workqueue: Implement system-wide nr_active enforcement
> > for unbound workqueues)
> > + the fix needed for that change:
> >   15930da42f89 (workqueue: Don't call cpumask_test_cpu() with -1 CPU
> > in wq_update_node_max_active())
>
> This should be fixed by d40f92020c7a ("workqueue: The default node_nr_active
> should have its max set to max_active"). Can you please confirm the fix?

Ah! Thank you, that does resolve the issue!

> Thanks and sorry about the hassle.

Thanks so much for the quick response (can't beat a fix already in the tree!)
-john