bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d3c8cdcae60184bd44b6271a6634bed6ecaf256c6973d1fb6a9d7bc567bea384 run #0: crashed: inconsistent lock state in sco_conn_del run #1: crashed: inconsistent lock state in sco_conn_del run #2: crashed: inconsistent lock state in sco_sock_timeout run #3: crashed: inconsistent lock state in sco_conn_del run #4: crashed: inconsistent lock state in sco_sock_timeout run #5: crashed: inconsistent lock state in sco_conn_del run #6: crashed: inconsistent lock state in sco_sock_timeout run #7: crashed: inconsistent lock state in sco_sock_timeout run #8: crashed: inconsistent lock state in sco_conn_del run #9: crashed: inconsistent lock state in sco_sock_timeout run #10: crashed: inconsistent lock state in sco_sock_timeout run #11: crashed: inconsistent lock state in sco_sock_timeout run #12: crashed: inconsistent lock state in sco_sock_timeout run #13: crashed: inconsistent lock state in sco_sock_timeout run #14: crashed: inconsistent lock state in sco_sock_timeout run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD 162b95d01320370b80cb2d5724cea4ae538ac740 testing commit 162b95d01320370b80cb2d5724cea4ae538ac740 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5c3d846b22bb8a33ea7054f2c19ade35529492705381b2758648936feecd8a7a all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 39m46.141860882s (build: 24m42.643611414s, test: 14m25.938043162s) the crash still happens on HEAD commit msg: Linux 4.14.244 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci1 command 0x041b 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: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout