bisecting fixing commit since cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 building syzkaller on 9d2ab5dfe7727dfea4b9b279f4edf731acb386ef testing commit cfb41ef9deb1e6572ac218ddfcec9567e5d1c101 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5d96b3bddcfa185600cbe84d3e65ae63985696823a15e5b73ae710fdf4e13e69 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD e3a56aaade89bc89f33baec11b12538fc22536e2 testing commit e3a56aaade89bc89f33baec11b12538fc22536e2 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: a9278b00060989059631057c01b48762768ec9b269d9465bc37f8f66b4cb17db all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 23m7.359897565s (build: 16m13.051105637s, test: 6m17.615995069s) the crash still happens on HEAD commit msg: Linux 4.14.277 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout