bisecting fixing commit since cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 building syzkaller on 9d2ab5dfe7727dfea4b9b279f4edf731acb386ef testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 084fadd1c28b0c5100f48ba60984642f59709444229ae63e891471db9ca1f97f all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD fa33f9094f36943ea32f7fbe323293b62e96151d testing commit fa33f9094f36943ea32f7fbe323293b62e96151d compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 4f30ca68aaa4d7c36f1f279a48e096f962c0e084a4ef010035e1000c688116cf all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 29m31.366019028s (build: 22m35.688526262s, test: 6m19.338324255s) the crash still happens on HEAD commit msg: Linux 4.14.268 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout