bisecting fixing commit since bd634aa6416382439890b78f7be0023020a86207 building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9 testing commit bd634aa6416382439890b78f7be0023020a86207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 90237378eebc190a76aa19775555b9bf48c93da6af045442a2908718f0d193ba all runs: crashed: WARNING in hsr_addr_subst_dest testing current HEAD af48f51cb5934738a3ee97e951d7dededf029488 testing commit af48f51cb5934738a3ee97e951d7dededf029488 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d94666f2ef5f1bec9508947f8a82cac7246c80633c4d80607a68957dfe4df822 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 39m48.348728364s (build: 26m58.548454679s, test: 12m19.465134259s) the crash still happens on HEAD commit msg: Linux 4.14.271 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout