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[83.28.48.5]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49b0d263dd5sm25955575e9.1.2026.08.26.23.02.28 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Wed, 26 Aug 2026 23:02:29 -0700 (PDT) Date: Thu, 27 Aug 2026 08:02:26 +0200 From: Michal Pecio To: syzbot Cc: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, rafael@kernel.org, stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [usb?] INFO: task hung in unbind_store Message-ID: <20260827080226.4ec229d3.michal.pecio@gmail.com> In-Reply-To: <6a8efd77.50659fcc.60cd.0001.GAE@google.com> References: <6a8adc31.ae6ddae5.3da009.0064.GAE@google.com> <6a8efd77.50659fcc.60cd.0001.GAE@google.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 Wed, 26 Aug 2026 07:51:35 -0700, syzbot wrote: > INFO: task syz.0.23:5988 blocked for more than 143 seconds. > Not tainted syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz.0.23 state:D stack:27344 pid:5988 tgid:5988 ppid:5772 task_flags:0x400140 flags:0x08080002 > Call Trace: > > context_switch kernel/sched/core.c:5520 [inline] > __schedule+0x17d4/0x5820 kernel/sched/core.c:7270 > __schedule_loop kernel/sched/core.c:7347 [inline] > schedule+0x164/0x2b0 kernel/sched/core.c:7362 > schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419 > __mutex_lock_common kernel/locking/mutex.c:726 [inline] > __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821 > device_lock include/linux/device.h:1104 [inline] > __device_driver_lock drivers/base/dd.c:1170 [inline] > device_release_driver_internal+0x93/0x880 drivers/base/dd.c:1369 > unbind_store+0x1a1/0x1d0 drivers/base/bus.c:244 #syz test --- a/drivers/usb/misc/sisusbvga/sisusbvga.c +++ b/drivers/usb/misc/sisusbvga/sisusbvga.c @@ -323,6 +323,7 @@ static int sisusb_send_bulk_msg(struct sisusb_usb_data *sisusb, int ep, int len, unsigned int pipe; char *buffer; + dev_info(&sisusb->sisusb_dev->dev, "sisusb_send_bulk_msg()\n"); (*bytes_written) = 0; /* Sanity check */ @@ -378,7 +379,7 @@ static int sisusb_send_bulk_msg(struct sisusb_usb_data *sisusb, int ep, int len, result = sisusb_bulkout_msg(sisusb, index, pipe, buffer, thispass, &transferred_len, - async ? 0 : 5 * HZ, tflags); + async ? 0 : HZ / 2, tflags); if (result == -ETIMEDOUT) {