bisecting fixing commit since 29c52025152bab4c557d8174da58f1a4c8e70438 building syzkaller on 3e5ed8b45e7a561d6344a4d3d7bf3bfb8f24a7b3 testing commit 29c52025152bab4c557d8174da58f1a4c8e70438 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: e159af60abfe5e050e8903a2ea63e2b9149083a38f890394184b871ecb79661a all runs: crashed: WARNING in hsr_forward_skb testing current HEAD ce4d1565392b2dc8ea33032615c934c3dc6a32bb testing commit ce4d1565392b2dc8ea33032615c934c3dc6a32bb compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: c824a2f2beeee28e496df8d92def1eacc4ed6f46db88b029f9563fe6f3ef7be5 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 25m39.948567049s (build: 19m6.391162726s, test: 6m3.119521351s) the crash still happens on HEAD commit msg: Linux 4.14.241 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout