Re: [PATCH 4.19-rt] workqueue: Fix deadlock due to recursive locking of pool->lock

[Daniel Wagner]

On Mon, Mar 13, 2023 at 10:36:41AM +0100, Sebastian Andrzej Siewior wrote:
> On 2023-02-28 14:49:38 [-0800], Brennan Lamoreaux (VMware) wrote:
> > Upstream commit d8bb65ab70f7 ("workqueue: Use rcuwait for wq_manager_wait")
> > replaced the waitqueue with rcuwait in the workqueue code. This change
> > involved removing the acquisition of pool->lock in put_unbound_pool(),
> > as it also adds the function wq_manager_inactive() which acquires this same
> > lock and is called one line later as a parameter to rcu_wait_event().
> 
> Daniel, I double checked and this patch is correct - the backport was
> faulty. Could you please pick it up and release an update?

Sure. I've updated the v4.19-rt branch and added this patch. Running local tests
now.