bisecting fixing commit since 2b79150141611d3c6e1b55d4e70f49602482f0b8 building syzkaller on cba33199be220cbf61f7c0c8223d88a25a913d6f testing commit 2b79150141611d3c6e1b55d4e70f49602482f0b8 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 27065d232a2821e603fa479def55e83d0750ac796eff51f17a3879b956f78a7f run #0: crashed: inconsistent lock state in sco_sock_timeout run #1: crashed: inconsistent lock state in sco_conn_del 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_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_sock_timeout run #9: crashed: inconsistent lock state in sco_sock_timeout run #10: crashed: inconsistent lock state in sco_sock_timeout run #11: OK run #12: OK run #13: OK run #14: OK run #15: OK run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD eb045674aab31aa55a4f9aec27cce36e3d946a21 testing commit eb045674aab31aa55a4f9aec27cce36e3d946a21 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 38c33f7d59005cc06321c1bf1cf5ced3f47c83511ad3d702c1fb526bb19e32dd all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 35m51.433669656s (build: 20m28.237262438s, test: 14m38.825407713s) the crash still happens on HEAD commit msg: Linux 4.14.272 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci1 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: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout