bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on f89ed068375b8e31b9575a0ecc834c602657a9a9 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 10782e3b09f26720330a3879a2b2388461c2829c661a5530f3d4d9df6f3c07f1 run #0: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #1: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #2: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #3: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #4: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #5: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #6: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #7: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #8: crashed: SYZFAIL: netlink_send_ext: short netlink write run #9: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #10: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #11: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #12: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #13: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #14: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #15: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #16: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #17: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #18: crashed: SYZFAIL: netlink_send_ext: netlink read failed run #19: crashed: SYZFAIL: netlink_send_ext: netlink read failed testing current HEAD f96eb53cbd76415edfba99c2cfa88567a885a428 testing commit f96eb53cbd76415edfba99c2cfa88567a885a428 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 2c910208d52aa25f522779c4ccb2378afa24e5467b774e7f884beff03c8dff5d all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 21m46.289716274s (build: 15m3.752892823s, test: 6m19.15503095s) the crash still happens on HEAD commit msg: Linux 4.14.246 crash: unregister_netdevice: waiting for DEV to become free can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. unregister_netdevice: waiting for ip6gre0 to become free. Usage count = -1 Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout