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(2001-1c00-0c1e-bf00-d69d-5353-dba5-ee81.cable.dynamic.v6.ziggo.nl. [2001:1c00:c1e:bf00:d69d:5353:dba5:ee81]) by smtp.gmail.com with ESMTPSA id c9-20020a17090618a900b007313a25e56esm3677726ejf.29.2022.08.20.08.29.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 20 Aug 2022 08:29:40 -0700 (PDT) Message-ID: Date: Sat, 20 Aug 2022 17:29:39 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.12.0 From: Hans de Goede Subject: 6.0-rc1 new RCU stall warning/stack trace To: Mathias Nyman , linux-usb , "regressions@lists.linux.dev" Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi All, While dogfooding 6.0-rc1 on my main workstation I noticed the following new RCU stall warning/stack trace after a suspend/resume: [ 290.653114] xhci_hcd 0000:16:00.0: xHC error in resume, USBSTS 0x401, Reinit ... [ 290.653253] usb usb1: root hub lost power or was reset [ 290.653255] usb usb2: root hub lost power or was reset ... [ 290.684960] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 9-...D } 28 jiffies s: 985 root: 0x1/. [ 290.684972] rcu: blocking rcu_node structures (internal RCU debug): l=1:0-15:0x200/. [ 290.684975] Task dump for CPU 9: [ 290.684977] task:kworker/u64:20 state:R running task stack: 0 pid: 3993 ppid: 2 flags:0x00004008 [ 290.684982] Workqueue: events_unbound async_run_entry_fn [ 290.684987] Call Trace: [ 290.684988] [ 290.684994] ? lock_is_held_type+0xe3/0x140 [ 290.684999] ? find_held_lock+0x2b/0x80 [ 290.685003] ? lock_release+0x135/0x2d0 [ 290.685008] ? delay_halt+0x3b/0x60 [ 290.685012] ? xhci_handshake+0x3e/0xb0 [ 290.685016] ? xhci_reset+0x6a/0x100 [ 290.685019] ? xhci_resume+0x1ec/0x600 [ 290.685023] ? resume_common+0xa0/0x100 [ 290.685026] ? pci_pm_poweroff_noirq+0x100/0x100 [ 290.685030] ? dpm_run_callback+0x53/0xc0 [ 290.685034] ? device_resume+0xa8/0x200 [ 290.685038] ? async_resume+0x19/0x30 [ 290.685040] ? async_run_entry_fn+0x30/0x130 [ 290.685043] ? process_one_work+0x257/0x570 [ 290.685050] ? worker_thread+0x4f/0x3a0 [ 290.685054] ? process_one_work+0x570/0x570 [ 290.685056] ? kthread+0xf5/0x120 [ 290.685058] ? kthread_complete_and_exit+0x20/0x20 [ 290.685062] ? ret_from_fork+0x22/0x30 [ 290.685072] Note I've not seen any negative side-effects from this yet, still I thought it would be good to report this. Regards, Hans