bisecting fixing commit since a35d65bedfbc38cffe2701798cd6810bbdf07892 building syzkaller on 3cd800e43d452c348a66ba475143831d94969a24 testing commit a35d65bedfbc38cffe2701798cd6810bbdf07892 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 449e70aca1a8e93930ac23f0e01f6b186fe07bebb6e43469e91935ae14a9fe0b all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 15a1c6b6f5162f7b70cf9a77cd8ed9771c1f0b53 testing commit 15a1c6b6f5162f7b70cf9a77cd8ed9771c1f0b53 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 6f2ba62d2fb809be00e8774ae29edb88e9273538a951f5515f743ab54ddf0202 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 31m40.240278808s (build: 24m49.628130906s, test: 6m7.161931194s) the crash still happens on HEAD commit msg: Linux 4.14.276 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 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: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout