bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on f89ed068375b8e31b9575a0ecc834c602657a9a9 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: c15fef972e0d052480d379e68ca4dacd053409d81e42a605204bbfb9d56f564c 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: netlink read failed run #3: crashed: SYZFAIL: netlink_send_ext: short netlink write 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 fa33f9094f36943ea32f7fbe323293b62e96151d testing commit fa33f9094f36943ea32f7fbe323293b62e96151d compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 0b377b74b037fd78de64129f37a27515493f7496457fc1f9a5ba4dba70437f78 all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 21m49.004731631s (build: 14m29.376203375s, test: 6m56.810888905s) the crash still happens on HEAD commit msg: Linux 4.14.268 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: hci2 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci5 command 0x0419 tx timeout Bluetooth: hci1 command 0x0419 tx timeout Bluetooth: hci2 command 0x0419 tx timeout Bluetooth: hci3 command 0x0419 tx timeout Bluetooth: hci4 command 0x0419 tx timeout