rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P973 } 4675 jiffies s: 2737 root: 0x0/T rcu: blocking rcu_node structures (internal RCU debug): wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 usb 6-1: new high-speed USB device number 2 using dummy_hcd usb 6-1: config 0 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 0, changing to 7 usb 6-1: New USB device found, idVendor=0926, idProduct=3333, bcdDevice= 0.40 usb 6-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 6-1: config 0 descriptor??