resume: system hang due to modem usb bug
saw this once now. the system was not responding anymore:
[ 1223.395134] usb 1-1.2: usb auto-suspend, wakeup 1
[ 1223.416962] hub 1-1:1.0: hub_suspend
[ 1223.440439] usb 1-1: usb auto-suspend, wakeup 1
[ 1223.464948] hub 1-0:1.0: hub_suspend
[ 1230.801792] usb usb1: usb wakeup-resume
[ 1230.805690] hub 1-0:1.0: hub_resume
[ 1230.809266] usb usb1-port1: status 0507 change 0000
[ 1230.814208] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0000
[ 1230.844437] hub 1-0:1.0: state 7 ports 1 chg 0000 evt 0002
[ 1230.876918] usb 1-1: usb wakeup-resume
[ 1230.908994] usb 1-1: Waited 0ms for CONNECT
[ 1230.913202] usb 1-1: finish resume
[ 1230.916750] hub 1-1:1.0: hub_resume
[ 1230.920284] usb 1-1-port1: status 0507 change 0000
[ 1230.925175] usb 1-1-port2: status 0503 change 0004
[ 1230.930074] usb usb1-port1: resume, status 0
[ 1230.934393] hub 1-1:1.0: state 7 ports 3 chg 0000 evt 0004
[ 1230.964940] usb 1-1.2: usb wakeup-resume
[ 1230.996906] usb 1-1.2: Waited 0ms for CONNECT
[ 1231.001291] usb 1-1.2: finish resume
[ 1231.005533] usb 1-1-port2: resume, status 0
[ 1231.923186] hub 1-1:1.0: state 7 ports 3 chg 0000 evt 0004
[ 1231.934572] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.940722] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1231.950555] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.956717] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1231.964846] usb 1-1-port2: status 0100, change 0001, 12 Mb/s
[ 1231.970848] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.970905] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1231.977395] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.977445] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1231.983319] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.983339] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1231.989762] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.989780] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1231.995576] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1231.995598] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1232.002058] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
[ 1232.002075] qmi_wwan 1-1.2:1.4: wdm_int_callback - 0 bytes
[ 1232.007913] qmi_wwan 1-1.2:1.4: nonzero urb status received: -71
(...)
(goes on forever)