bisecting fixing commit since 7d7d1c0ab3eb7c8d8f63a126535018007823b207 building syzkaller on f54a5c0916af7d798b204eb70c484f154d69e0a3 testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 978ad8749940bcbbe26175ccc4feccc7782ff6417582a5665a43d48fbe288085 run #0: crashed: kernel BUG in llc_sap_action_send_xid_c run #1: crashed: kernel BUG in llc_sap_action_send_xid_c run #2: crashed: kernel BUG in llc_sap_action_send_xid_c run #3: crashed: kernel BUG in llc_sap_action_send_xid_c run #4: crashed: kernel BUG in corrupted run #5: crashed: kernel BUG in llc_sap_action_send_xid_c run #6: crashed: kernel BUG in llc_sap_action_send_xid_c run #7: crashed: kernel BUG in llc_sap_action_send_xid_c run #8: crashed: kernel BUG in llc_sap_action_send_xid_c run #9: crashed: kernel BUG in llc_sap_action_send_xid_c run #10: crashed: kernel BUG in llc_sap_action_send_xid_c run #11: crashed: kernel BUG in llc_sap_action_send_xid_c run #12: crashed: kernel BUG in llc_sap_action_send_xid_c run #13: crashed: kernel BUG in llc_sap_action_send_xid_c run #14: crashed: kernel BUG in llc_sap_action_send_xid_c run #15: crashed: kernel BUG in corrupted run #16: crashed: kernel BUG in llc_sap_action_send_xid_c run #17: crashed: kernel BUG in llc_sap_action_send_xid_c run #18: crashed: kernel BUG in llc_sap_action_send_xid_c run #19: crashed: kernel BUG in corrupted testing current HEAD 21ad423fe5210f5aa50bd43f9ae99b655090a227 testing commit 21ad423fe5210f5aa50bd43f9ae99b655090a227 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 9d00c80eda2a86e08e3cd9f040e90f6d45b626790f168302f684da3415fee160 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 29m36.301452619s (build: 22m17.633623698s, test: 6m35.965256852s) the crash still happens on HEAD commit msg: Linux 4.14.265 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout