bisecting fixing commit since 6b6446efedb27c2766745a04f9b5d4449f51391d building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 6b6446efedb27c2766745a04f9b5d4449f51391d compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 4924b7ade863e989f083a60abb607c2cde412ad1c6414ac2324c4a7f3b3f31f1 all runs: crashed: WARNING in ieee80211_probe_client testing current HEAD dffb5c6ff09c51ed585e3e7665143df103867fc8 testing commit dffb5c6ff09c51ed585e3e7665143df103867fc8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d2cba73eb8862e9ef68b1917cddb5bb301e7aab84652da36498ac29dfcd09ebb all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 23m10.78907241s (build: 16m9.684500993s, test: 6m30.738409605s) the crash still happens on HEAD commit msg: Linux 4.14.280 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