bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d855c7b34524e89c79a081a670ea5af469b10d182e41df47d20f0ac7079e4105 run #0: crashed: inconsistent lock state in sco_sock_timeout run #1: crashed: inconsistent lock state in sco_sock_timeout run #2: crashed: inconsistent lock state in sco_conn_del run #3: crashed: inconsistent lock state in sco_sock_timeout run #4: crashed: inconsistent lock state in sco_conn_del run #5: crashed: inconsistent lock state in sco_sock_timeout run #6: crashed: inconsistent lock state in sco_conn_del run #7: crashed: inconsistent lock state in sco_conn_del run #8: crashed: inconsistent lock state in sco_sock_timeout 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 8ea4f73cfa7e0555dc03aedde52db54a6587ab43 testing commit 8ea4f73cfa7e0555dc03aedde52db54a6587ab43 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: da5aae735ec8a5f49d77ae1dfd82b15d6f158703e11f218278d897db10d5452d all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 34m36.473624605s (build: 19m36.433484338s, test: 14m28.92513932s) the crash still happens on HEAD commit msg: Linux 4.14.247 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout