bisecting fixing commit since 46914f96189be290174e378c6bf9ccadfdb9ca1e building syzkaller on 2489ab887a86e8b1b253aef742e365a606db3a4f testing commit 46914f96189be290174e378c6bf9ccadfdb9ca1e compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: afffcecb39948a0a120fbf5e4cecb0a7f0448fd25ec9a9e7d114e0fabadd4004 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD af48f51cb5934738a3ee97e951d7dededf029488 testing commit af48f51cb5934738a3ee97e951d7dededf029488 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 492fe87f96f86443d4080db3e3ec58830746a67696eb9405cdc1481d9434b444 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 25m13.778924766s (build: 18m20.755239158s, test: 6m12.638367401s) the crash still happens on HEAD commit msg: Linux 4.14.271 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: hci2 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1