linux-kernel - Re: 6.15/regression/bisected - lockdep warning: circular locking dependency detected when plugging USB stick after ffa1e7ada456

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Message-ID: <8acbc346-98f8-44fc-9675-0c3a7da87d21@kernel.dk>
Date: Tue, 22 Jul 2025 06:14:18 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Hillf Danton <hdanton@...a.com>,
 Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc: thomas.hellstrom@...ux.intel.com, linux-block@...r.kernel.org,
 linux-kernel@...r.kernel.org, Ming Lei <ming.lei@...hat.com>,
 regressions@...ts.linux.dev
Subject: Re: 6.15/regression/bisected - lockdep warning: circular locking
 dependency detected when plugging USB stick after ffa1e7ada456

On 7/21/25 6:51 PM, Hillf Danton wrote:
> Try the diff that serializes elevator_change() with q->elevator_lock if
> reproducer is available.

Hillf, these seemingly random and not tested or thought through patches
flung out in response to reports is not useful. It just wastes peoples
time and resources.

-- 
Jens Axboe