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([2001:a61:1370:2201:dbf:8c7d:e87d:3baf]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5c8e05eb357sm3204024a12.69.2024.10.07.07.16.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 07 Oct 2024 07:16:28 -0700 (PDT) Message-ID: Date: Mon, 7 Oct 2024 16:16:27 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [usb?] INFO: task hung in usb_register_dev (2) To: syzbot , gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <6703c076.050a0220.49194.0505.GAE@google.com> Content-Language: en-US From: Oliver Neukum In-Reply-To: <6703c076.050a0220.49194.0505.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 07.10.24 13:05, syzbot wrote: > INFO: task kworker/1:0:25 blocked for more than 144 seconds. > Not tainted 6.12.0-rc1-next-20241003-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:kworker/1:0 state:D stack:20416 pid:25 tgid:25 ppid:2 flags:0x00004000 > Workqueue: pm pm_runtime_work > Call Trace: > > context_switch kernel/sched/core.c:5315 [inline] > __schedule+0x1895/0x4b30 kernel/sched/core.c:6675 > __schedule_loop kernel/sched/core.c:6752 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6767 > usb_poison_urb+0x1bc/0x2e0 drivers/usb/core/urb.c:763 This points to a bug in the HCD. usb_poison_urb() is guaranteed to make progress. > poison_urbs drivers/usb/class/cdc-wdm.c:342 [inline] > wdm_suspend+0x174/0x380 drivers/usb/class/cdc-wdm.c:1271 > usb_suspend_interface drivers/usb/core/driver.c:1328 [inline] > usb_suspend_both+0x2a5/0x1140 drivers/usb/core/driver.c:1433 > usb_runtime_suspend+0x59/0x100 drivers/usb/core/driver.c:1968 What HC is used for these tests? Regards Oliver