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[37.188.169.187]) by smtp.gmail.com with ESMTPSA id 69sm462466wma.16.2020.07.20.11.16.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2020 11:16:07 -0700 (PDT) Date: Mon, 20 Jul 2020 20:16:05 +0200 From: Michal Hocko To: Alan Stern Cc: LKML , Greg KH , linux-usb@vger.kernel.org, "Rafael J. Wysocki" Subject: Re: kworker/0:3+pm hogging CPU Message-ID: <20200720181605.GC4061@dhcp22.suse.cz> References: <20200720083956.GA4074@dhcp22.suse.cz> <20200720135857.GB1228057@rowland.harvard.edu> <20200720143213.GJ4074@dhcp22.suse.cz> <20200720151255.GE1228057@rowland.harvard.edu> <20200720163355.GA4061@dhcp22.suse.cz> <20200720173807.GJ1228057@rowland.harvard.edu> <20200720174530.GB4061@dhcp22.suse.cz> <20200720174812.GK1228057@rowland.harvard.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200720174812.GK1228057@rowland.harvard.edu> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 20-07-20 13:48:12, Alan Stern wrote: > On Mon, Jul 20, 2020 at 07:45:30PM +0200, Michal Hocko wrote: > > On Mon 20-07-20 13:38:07, Alan Stern wrote: > > > On Mon, Jul 20, 2020 at 06:33:55PM +0200, Michal Hocko wrote: > > > > On Mon 20-07-20 11:12:55, Alan Stern wrote: > > > > [...] > > > > > sudo echo 'module usbcore =p' >/debug/dynamic_debug/control > > > > > > > > > > Then wait long enough for some interesting messages to appear in the > > > > > kernel log (it should only take a few seconds if the worker thread is as > > > > > busy as you say) and collect the output from the dmesg command. > > > > > > > > > > To turn dynamic debugging back off when you're finished, use the same > > > > > command with "=p" changed to "-p". > > > > > > > > [ 95.395815] hub 2-0:1.0: state 7 ports 6 chg 0006 evt 0000 > > > > [ 95.395824] usb usb2-port1: status 0088, change 0000, 5.0 Gb/s > > > > [ 95.395838] usb usb2-port2: status 0088, change 0000, 5.0 Gb/s > > > > [ 95.396016] hub 2-0:1.0: hub_suspend > > > > [ 95.396023] usb usb2: bus auto-suspend, wakeup 1 > > > > [ 95.396029] usb usb2: bus suspend fail, err -16 > > > > > > Okay, that's the problem. You may get more specific information about > > > the suspend failure if you turn on dynamic debugging for the xhci-hcd > > > module (same command as above but with xhci-hcd instead of usbcore). > > > > Would that help to pinpoint the problem down? > > It might. I can't say for sure without seeing the output. echo 'module xhci-hcd =p' >/sys/kernel/debug/dynamic_debug/control doesn't yield to any output. I have tried both with and without usbcore debug output enabled. In the former there is no new output and for the later I get the same I have posted earlier. -- Michal Hocko SUSE Labs