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From: Tejun Heo <tj@kernel.org>
To: Andrea Righi <arighi@nvidia.com>
Cc: David Vernet <void@manifault.com>,
	Changwoo Min <changwoo@igalia.com>,
	linux-kernel@vger.kernel.org, Breno Leitao <leitao@debian.org>
Subject: Re: [PATCH] sched_ext: Fix potential deadlock in destroy_dsq()
Date: Thu, 16 Jan 2025 16:06:26 -1000	[thread overview]
Message-ID: <Z4m7Iq_eiTZmASd_@slm.duckdns.org> (raw)
In-Reply-To: <20250116115101.549175-1-arighi@nvidia.com>

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

  reply	other threads:[~2025-01-17  2:06 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-16 11:51 [PATCH] sched_ext: Fix potential deadlock in destroy_dsq() Andrea Righi
2025-01-17  2:06 ` Tejun Heo [this message]
2025-01-17  9:46   ` Breno Leitao
2025-01-17  9:55     ` Andrea Righi

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