bisecting fixing commit since 964f3712e6a7447d9d3203f2be3f6c50e78ea179 building syzkaller on 4d1b57d4d1aa7f8938163f8debd9293c062482b0 testing commit 964f3712e6a7447d9d3203f2be3f6c50e78ea179 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 638a37edff82d170a38451572373f69fa6c1d7fe05715b7b78ff4ff42bca6c97 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: 4a886ac8f5f120ccffdbd6513564ecbc73cf9a96092a172d245385cc5b02179e all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 21m36.933729565s (build: 14m42.458234498s, test: 6m23.888326342s) the crash still happens on HEAD commit msg: Linux 4.14.285 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