linux-kernel - Re: [RESEND] Circular locking dependency involving, elevator_lock, rq_qos_mutex and pcpu_alloc

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Message-ID: <aBOosuedqt15xS1K@slm.duckdns.org>
Date: Thu, 1 May 2025 07:00:34 -1000
From: Tejun Heo <tj@...nel.org>
To: Nilay Shroff <nilay@...ux.ibm.com>
Cc: Jakub Kicinski <kuba@...nel.org>, Jens Axboe <axboe@...nel.dk>,
	cgroups@...r.kernel.org, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Ming Lei <ming.lei@...hat.com>
Subject: Re: [RESEND] Circular locking dependency involving, elevator_lock,
 rq_qos_mutex and pcpu_alloc_mutex

Hello,

On Tue, Apr 08, 2025 at 12:32:50PM +0530, Nilay Shroff wrote:
> Thanks for the report! This is now a known issue. And we're currently working on
> it to cut dependency of q->io_lockdep_map (or queue freeze-lock) on q->elevator_lock. 
> Please see below :https://lore.kernel.org/linux-block/67e6b425.050a0220.2f068f.007b.GAE@google.com/
> https://lore.kernel.org/all/20250403105402.1334206-1-ming.lei@redhat.com/

Any progress on this? The last activity on the threads seems to be back on
Apr 10th and we're getting close to rc5. If we need to revert, I think it's
about time to decide.

Thanks.

-- 
tejun