linux-kernel - Re: [PATCH] sched_ext: Fix potential deadlock in destroy

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Message-ID: <Z4m7Iq_eiTZmASd_@slm.duckdns.org>
Date: Thu, 16 Jan 2025 16:06:26 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <arighi@...dia.com>
Cc: David Vernet <void@...ifault.com>, Changwoo Min <changwoo@...lia.com>,
	linux-kernel@...r.kernel.org, Breno Leitao <leitao@...ian.org>
Subject: Re: [PATCH] sched_ext: Fix potential deadlock in destroy_dsq()

On Thu, Jan 16, 2025 at 12:51:01PM +0100, Andrea Righi wrote:
> When creating and destroying DSQs concurrently, a potential deadlock can
> occur due to a circular locking dependency between the locks involved in
> the operations:
> 
>  - create_dsq():
> 
>   rhashtable_bucket --> rq->lock --> dsq->lock

Hmm... this is probably the same thing that Breno tried to fix with
rhashtable update. Breno, what's the current state of that patch? I saw bug
reports and fix patch flying by but didn't track them closely.

Thanks.

-- 
tejun