bisecting fixing commit since bd634aa6416382439890b78f7be0023020a86207 building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9 testing commit bd634aa6416382439890b78f7be0023020a86207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: e5728593a85a7e3b3123563f101a448057d3aab31205c970bdf0cac1126b2bfd all runs: crashed: WARNING in hsr_addr_subst_dest testing current HEAD 1ccc597f801cbecffcaed7f2d1f620ec48f6f8df testing commit 1ccc597f801cbecffcaed7f2d1f620ec48f6f8df compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 572be0557248c325cc5f67ad5baa45703de9c0baf5e7676c97e66208c9620686 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 22m9.997322131s (build: 15m12.717764251s, test: 6m24.798635886s) the crash still happens on HEAD commit msg: Linux 4.14.283 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