On Tue, 15 Dec 2015, Cornea, Alexandru wrote: > Hello, > Apologies for the late response. > We tried the patch, and although the system does not crash anymore, another issue occurs. > > Depending on platform (Gigabyte GXBT, Galileo board), the USB port that is used for testing or all USB ports become blocked and cannot recognize new devices. > Also, soft shutdown / reboot seems to hang. > > The below trace gives more information: > > [ 240.304129] INFO: task kworker/3:2:93 blocked for more than 120 seconds. > [ 240.304173] Tainted: G E 4.3.0with-patch #8 > [ 240.304190] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > [ 240.304212] kworker/3:2 D ffff88011e2d6980 0 93 2 0x00000000 > [ 240.304241] Workqueue: usb_hub_wq hub_event > [ 240.304257] ffff8800c73bbb78 0000000000000046 ffff88011931aa00 ffff8800c7107000 > [ 240.304286] ffff8800c73bc000 ffff8800c9bb6494 ffff8800c7107000 00000000ffffffff > [ 240.304315] ffff8800c9bb6498 ffff8800c73bbb90 ffffffff817ab963 ffff8800c9bb6490 > [ 240.304344] Call Trace: > [ 240.304357] [<ffffffff817ab963>] schedule+0x33/0x80 > [ 240.304373] [<ffffffff817abc0e>] schedule_preempt_disabled+0xe/0x10 > [ 240.304393] [<ffffffff817ad445>] __mutex_lock_slowpath+0x95/0x110 > [ 240.304413] [<ffffffff817ad4df>] mutex_lock+0x1f/0x2f > [ 240.304430] [<ffffffff814f20bb>] device_release_driver+0x1b/0x30 > [ 240.304448] [<ffffffff814f0ea1>] bus_remove_device+0x101/0x170 > [ 240.304467] [<ffffffff814ed5f9>] device_del+0x139/0x260 > [ 240.304485] [<ffffffff815b728f>] ? usb_remove_ep_devs+0x1f/0x30 > [ 240.304504] [<ffffffff815b0696>] usb_disable_device+0xa6/0x280 > [ 240.304522] [<ffffffff815a6474>] usb_disconnect+0x94/0x270 > [ 240.304539] [<ffffffff815a8533>] hub_event+0x693/0x1420 > [ 240.304557] [<ffffffff8109259e>] process_one_work+0x14e/0x3d0 > [ 240.304575] [<ffffffff81092c4a>] worker_thread+0x11a/0x470 > [ 240.305058] [<ffffffff817ab378>] ? __schedule+0x358/0x910 > [ 240.305527] [<ffffffff81092b30>] ? rescuer_thread+0x310/0x310 > [ 240.305992] [<ffffffff81098372>] kthread+0xd2/0xf0 > [ 240.306450] [<ffffffff810982a0>] ? kthread_park+0x50/0x50 > [ 240.306905] [<ffffffff817af54f>] ret_from_fork+0x3f/0x70 > [ 240.307357] [<ffffffff810982a0>] ? kthread_park+0x50/0x50 > [ 360.382912] INFO: task kworker/3:2:93 blocked for more than 120 seconds. > // same output every 120s I can't figure out the problem from this trace. Were there any other tasks blocked like this one? Please enable USB debugging (echo 'module usbcore =p' >/sys/kernel/debug/dynamic_debug/control), run the test again, and post the resulting dmesg log. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
