bisecting fixing commit since ed99bf0e81b558df39f7db2fa96d0228be4198c6 building syzkaller on 0c5d9412d774262384cbdbe9d672b077364ed776 testing commit ed99bf0e81b558df39f7db2fa96d0228be4198c6 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 860a4f1db9ae536aa63ce258ea7e129ce1b403e6e6eadb16b9c7d0962d1e7f8c all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD e853993d29aa42ac4b3c2912db975a0a66d7a5b0 testing commit e853993d29aa42ac4b3c2912db975a0a66d7a5b0 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 324b870aec22a1b314522ef04603c37efadebe2d457923475493196ed6bbc592 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m12.329904003s (build: 15m17.010040177s, test: 6m17.195066114s) the crash still happens on HEAD commit msg: Linux 4.14.269 crash: unregister_netdevice: waiting for DEV to become free can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout