bisecting fixing commit since e3a56aaade89bc89f33baec11b12538fc22536e2 building syzkaller on 1fa34c1b4ca31728acc7dfc7ec2f221443b8d40f testing commit e3a56aaade89bc89f33baec11b12538fc22536e2 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 4edf942316e16714f6319645d03766993b9e3cb5a68a1278dcfcb337fd76426b all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 501eec4f9e138b958fc7438e7a745c0d6a7c68b3 testing commit 501eec4f9e138b958fc7438e7a745c0d6a7c68b3 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: ca004f917c4f4a76d2c3014988654069295d540916dfa935a7aa137595d8b2bf all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 29m54.710546508s (build: 23m18.094580131s, test: 6m2.901459013s) the crash still happens on HEAD commit msg: Linux 4.14.281 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout