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[83.28.48.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49b49236515sm53937925e9.1.2026.08.27.02.08.07 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 27 Aug 2026 02:08:07 -0700 (PDT) Date: Thu, 27 Aug 2026 11:08:03 +0200 From: Michal Pecio To: Greg KH Cc: syzbot , dakr@kernel.org, driver-core@lists.linux.dev, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, rafael@kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [usb?] INFO: task hung in unbind_store Message-ID: <20260827110803.49790ae3.michal.pecio@gmail.com> In-Reply-To: <20260827110006.66b07ea4.michal.pecio@gmail.com> References: <6a8adc31.ae6ddae5.3da009.0064.GAE@google.com> <2026082307-negligent-lusty-750a@gregkh> <20260827110006.66b07ea4.michal.pecio@gmail.com> Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 27 Aug 2026 11:00:06 +0200, Michal Pecio wrote: > And something is also wrong with those timeouts, because 20 times 5s > should still be less than 143 s. I asked Syzbot to try 500ms instead, > which ended up being over 3s in practice: > > [ 566.662036][ T6636] usb 4-1: sisusb_send_bulk_msg() > [ 569.717341][ T6636] usb 4-1: sisusb_send_bulk_msg() > [ 572.777761][ T6636] usb 4-1: sisusb_send_bulk_msg() > [ 575.845365][ T6636] usb 4-1: sisusb_send_bulk_msg() > > Same on my system, but patch below reduces the timeout to 500ms. > > I have no idea what's happening here. Looks like a bug? > Is it known that jiffies are totally unreliable like that? Sorry for the noise, timeouts are 500ms as inteneded but the function tries 6 times, which makes it 3 seconds.