bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on f89ed068375b8e31b9575a0ecc834c602657a9a9 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: c387b0fd5f541e004e9d5c982981e31b54078aaeafff6db7334382ef8810416f run #0: crashed: SYZFAIL: netlink_send_ext: short netlink write run #1: crashed: SYZFAIL: netlink_send_ext: short netlink write run #2: crashed: SYZFAIL: netlink_send_ext: short netlink write run #3: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #4: crashed: SYZFAIL: netlink_send_ext: short netlink write run #5: crashed: SYZFAIL: netlink_send_ext: short netlink write run #6: crashed: SYZFAIL: netlink_send_ext: short netlink write run #7: crashed: SYZFAIL: netlink_send_ext: short netlink write run #8: crashed: SYZFAIL: netlink_send_ext: short netlink write run #9: crashed: SYZFAIL: netlink_send_ext: short netlink write run #10: crashed: SYZFAIL: netlink_send_ext: short netlink write run #11: crashed: SYZFAIL: netlink_send_ext: short netlink write run #12: crashed: SYZFAIL: netlink_send_ext: short netlink write run #13: crashed: SYZFAIL: netlink_send_ext: short netlink write run #14: crashed: SYZFAIL: netlink_send_ext: short netlink write run #15: crashed: SYZFAIL: netlink_send_ext: short netlink write run #16: crashed: SYZFAIL: netlink_send_ext: short netlink write run #17: crashed: SYZFAIL: netlink_send_ext: short netlink write run #18: crashed: SYZFAIL: netlink_send_ext: short netlink write run #19: crashed: SYZFAIL: netlink_send_ext: short netlink write testing current HEAD b86ee2b7ae42b6b37a918b66236608e2cc325f59 testing commit b86ee2b7ae42b6b37a918b66236608e2cc325f59 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 032fd5716acc9f072e520762ab392d8f7852db8f18a2eb2ee31a3635e33cdaa0 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 29m56.630427446s (build: 22m43.227798376s, test: 6m47.800905659s) the crash still happens on HEAD commit msg: Linux 4.14.264 crash: unregister_netdevice: waiting for DEV to become free Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout