bisecting fixing commit since 313e82bbefb3d1d926858b58092f5d50f41d924d building syzkaller on 8f5a7b8cde529e0a19a53f79bdf9c6cad306827b testing commit 313e82bbefb3d1d926858b58092f5d50f41d924d compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 8538ba5937cf3ed91bb945d4a00ceb1d55f2f876c7de4517866d022ccd89ee22 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD f96eb53cbd76415edfba99c2cfa88567a885a428 testing commit f96eb53cbd76415edfba99c2cfa88567a885a428 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 31d0c41df49b3687c58160e48d5cbbb08fdfe1bae8c978567833168b2ba6421b all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 26m12.090904273s (build: 19m7.652909634s, test: 6m23.043140498s) the crash still happens on HEAD commit msg: Linux 4.14.246 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 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: hci3 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout