bisecting fixing commit since b8f3be299d5176348b15cc59d55b85faa3dece68 building syzkaller on c885789257c76ea4479ea36282f5e0a2c7861e26 testing commit b8f3be299d5176348b15cc59d55b85faa3dece68 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: eeed32a87b63388887cce84137158f549eac52d966cd467f366df33c6644e514 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD ed2e96e119365437d6aa26a8a13eb39f77a43542 testing commit ed2e96e119365437d6aa26a8a13eb39f77a43542 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 57e4a147e985aca3b72627894a879e4ff52b69d82d791d6376d2d3c7a9d36305 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 23m49.878656676s (build: 16m57.470657117s, test: 6m31.216466759s) the crash still happens on HEAD commit msg: Linux 4.14.286 crash: unregister_netdevice: waiting for DEV to become free unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout