Re: possible deadlock in send_sigio

[Waiman Long]

On 6/11/20 7:55 PM, Boqun Feng wrote:
> Hi Peter and Waiman,
>
> On Thu, Jun 11, 2020 at 12:09:59PM -0400, Waiman Long wrote:
> > On 6/11/20 10:22 AM, Peter Zijlstra wrote:
> > > On Thu, Jun 11, 2020 at 09:51:29AM -0400, Waiman Long wrote:
> > >
> > > > There was an old lockdep patch that I think may address the issue, but was
> > > > not merged at the time. I will need to dig it out and see if it can be
> > > > adapted to work in the current kernel. It may take some time.
> > > Boqun was working on that; I can't remember what happened, but ISTR it
> > > was shaping up nice.
> > Yes, I am talking about Boqun's patch. However, I think he had moved to
> > another company and so may not be able to actively work on that again.
> I think you are talking about the rescursive read deadlock detection
> patchset:
>
> 	https://lore.kernel.org/lkml/20180411135110.9217-1-boqun.feng@xxxxxxxxx/
>
> Let me have a good and send a new version based on today's master of tip
> tree.
>
> Regards,
> Boqun

Good to hear back from you. I thought you may not able to work on it again.

Cheers,
Longman