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

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Message-ID: <03cf3cd2-8ddc-45ed-81ee-3cf8537f4163@linux.ibm.com>
Date: Thu, 1 May 2025 22:50:30 +0530
From: Nilay Shroff <nilay@...ux.ibm.com>
To: Tejun Heo <tj@...nel.org>
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



On 5/1/25 10:30 PM, Tejun Heo wrote:
> 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.
> 
This is currently actively being worked upon. 
Please see here : https://lore.kernel.org/all/20250430043529.1950194-1-ming.lei@redhat.com/
We expect it to be soon ready for merge.

Thanks,
--Nilay