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Tue, 17 Feb 2026 07:37:43 -0800 (PST) From: Jens Axboe To: nilay@linux.ibm.com, ming.lei@redhat.com, hch@lst.de, Yu Kuai Cc: yi.zhang@redhat.com, shinichiro.kawasaki@wdc.com, kbusch@kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org In-Reply-To: <20260214054350.2322436-1-yukuai@fnnas.com> References: <20260214054350.2322436-1-yukuai@fnnas.com> Subject: Re: [PATCH v2] blk-mq: use NOIO context to prevent deadlock during debugfs creation Message-Id: <177134266269.373694.2745476582847973429.b4-ty@kernel.dk> Date: Tue, 17 Feb 2026 08:37:42 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Mailer: b4 0.14.3 On Sat, 14 Feb 2026 13:43:50 +0800, Yu Kuai wrote: > Creating debugfs entries can trigger fs reclaim, which can enter back > into the block layer request_queue. This can cause deadlock if the > queue is frozen. > > Previously, a WARN_ON_ONCE check was used in debugfs_create_files() > to detect this condition, but it was racy since the queue can be frozen > from another context at any time. > > [...] Applied, thanks! [1/1] blk-mq: use NOIO context to prevent deadlock during debugfs creation (no commit info) Best regards, -- Jens Axboe