bisecting fixing commit since e3a56aaade89bc89f33baec11b12538fc22536e2 building syzkaller on 2df221f6ab480a3f2d315d283f26cfae890da3a1 testing commit e3a56aaade89bc89f33baec11b12538fc22536e2 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 923d734b7fa4ab052cbfe4b5a7b99bdebfaae1e9b06052544e9eb9a859204efd all runs: crashed: unregister_netdevice: waiting for DEV to become free testing current HEAD 424a46ea058e160ae6fdd0693092ba79da533f26 testing commit 424a46ea058e160ae6fdd0693092ba79da533f26 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: b146fa2a9541d3a366d2b655f90588245b978044f542eed704d92595f1b9d01a all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 27m45.365088358s (build: 15m48.161795896s, test: 11m30.160584154s) the crash still happens on HEAD commit msg: Linux 4.14.288 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