bisecting fixing commit since 4e68c9b0763ff55eaa69d6e519f07515f1c9037b building syzkaller on f115ae985a399ddce060f448097b8068450a8f48 testing commit 4e68c9b0763ff55eaa69d6e519f07515f1c9037b compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 932aa6d41131022a6a6e26f19f59b0e84fcfc950f65dabf19bc494e69bdeb6a6 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 5f9f3b0057d5c5782985784ba0159b05b4083055 testing commit 5f9f3b0057d5c5782985784ba0159b05b4083055 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: cee6103fdaa0cb9ab977fa7872fee37ce96d67444190cceb44d475e6b3910899 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m59.425904314s (build: 15m39.622333974s, test: 6m49.466819625s) the crash still happens on HEAD commit msg: Linux 4.14.255 crash: unregister_netdevice: waiting for DEV to become free can: request_module (can-proto-0) failed. Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout