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([2a02:3033:701:244:19c9:79b9:fe6b:6f9]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-48e2581f412sm3923306f8f.16.2026.10.21.00.48.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Oct 2026 00:48:58 -0700 (PDT) Message-ID: <85cde6cc-fdea-4bdd-8575-7e9d50c8781a@suse.com> Date: Wed, 21 Oct 2026 09:48:56 +0200 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] usb-storage: option_ms: bound probe-time bulk transfers To: Greg KH , Lee Yongjun Cc: stern@rowland.harvard.edu, digidietze@draisberghof.de, xiehongyu1@kylinos.cn, linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, syzbot+7317196294d50d6e55c3@syzkaller.appspotmail.com References: <20261013132033.4352-1-jun85566@gmail.com> <2026101310-crier-december-be03@gregkh> Content-Language: en-US From: Oliver Neukum In-Reply-To: <2026101310-crier-december-be03@gregkh> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 13.10.26 18:18, Greg KH wrote: > On Tue, Oct 13, 2026 at 10:20:33PM +0900, Lee Yongjun wrote: >> The Option device initialization path issues bulk transfers >> without a timeout. If a device does not complete a transfer, >> the USB hub worker can remain blocked while holding the device >> mutex, causing usb_device_read() to hang. > > So a broken device? On a generic note, the SCSI layer is ready to deal with broken devices. In consequence, so have SCSI LLDs. We cannot hold a lock that will stall the SCSI layer in error handling indefinitely. Regards Oliver