bisecting fixing commit since bd634aa6416382439890b78f7be0023020a86207 building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9 testing commit bd634aa6416382439890b78f7be0023020a86207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5ef02fcdcac919b8010e1a8ef19d47875331f9cfe41394e553346e0c76f7c910 all runs: crashed: WARNING in hsr_addr_subst_dest testing current HEAD 74766a973637a02c32c04c1c6496e114e4855239 testing commit 74766a973637a02c32c04c1c6496e114e4855239 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 93a42fffacd4ebb10de623aa4301df7fed3ccab130137d080151db39ecbf7695 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 28m42.15111139s (build: 16m11.300430307s, test: 12m6.661640722s) the crash still happens on HEAD commit msg: Linux 4.14.275 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout