bisecting fixing commit since a35d65bedfbc38cffe2701798cd6810bbdf07892 building syzkaller on 3cd800e43d452c348a66ba475143831d94969a24 testing commit a35d65bedfbc38cffe2701798cd6810bbdf07892 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5a124d56296ab5a8770b0c2ff66f134e52e6af89da78bc94429b7edf1940f92e all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 84bae26850e3b384a45f0f9a5f8b3b5983afacd8 testing commit 84bae26850e3b384a45f0f9a5f8b3b5983afacd8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: e31808c04c2faa6ef544159abe45f0bdbdf93c556bf8a49773c50f93f0d9e25e all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m46.729816876s (build: 15m28.778012888s, test: 6m55.475445725s) the crash still happens on HEAD commit msg: Linux 4.14.284 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout