bisecting fixing commit since 29c52025152bab4c557d8174da58f1a4c8e70438 building syzkaller on fcc6d71be2c3ce7d9305c04fc2e87af554571bac testing commit 29c52025152bab4c557d8174da58f1a4c8e70438 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 2bb3d3342e5cc12d136bc9b5531bcdf0b0ca64ea0f0587f85fa3aa4069e8b5cc all runs: crashed: SYZFAIL: clone failed testing current HEAD 35c4ba160ab6133e548468bd0bd1109990dc7736 testing commit 35c4ba160ab6133e548468bd0bd1109990dc7736 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 90695b6553f5e083a5f0106e06448e43662b106206fed63f4898df1bf44842fd all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 26m37.987380617s (build: 19m20.363664242s, test: 6m45.34512835s) the crash still happens on HEAD commit msg: Linux 4.14.245 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout