bisecting fixing commit since af1af6ebca0e28a97e5f802b9da695678fcd226a building syzkaller on 42718dd659525414aa0bf2794688ac94a32f7764 testing commit af1af6ebca0e28a97e5f802b9da695678fcd226a compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 07df28117a9f5ad5c0928e30cf8abf75c5e31ff92d1e83f3e8d118855ca470ab all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD f051383ef03bde49ca992f297ec80757a702e774 testing commit f051383ef03bde49ca992f297ec80757a702e774 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: c4f6887c02e882982b155fa67dfde5b41719cc7490b5b17fccc966469a29b407 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 21m22.840783216s (build: 14m22.529017834s, test: 6m39.729518715s) the crash still happens on HEAD commit msg: Linux 4.14.285 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: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout