bisecting fixing commit since 501eec4f9e138b958fc7438e7a745c0d6a7c68b3 building syzkaller on 3666edfeb55080ebe138d77417fa96fe2555d6bb testing commit 501eec4f9e138b958fc7438e7a745c0d6a7c68b3 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 3a42959e23e257d556a24faa13ea9568ccc3be62fa23690da41a75229a628215 all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD f051383ef03bde49ca992f297ec80757a702e774 testing commit f051383ef03bde49ca992f297ec80757a702e774 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d068ea0f29d19647ad34c85b30706625dbd18c99b36a3cd916f6ab6be5aa8b72 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 23m1.650024491s (build: 16m21.98437891s, test: 6m20.538391195s) the crash still happens on HEAD commit msg: Linux 4.14.285 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