bisecting fixing commit since 397a88b2cc869c823bf40bc403d36a62afec1edd building syzkaller on f89ed068375b8e31b9575a0ecc834c602657a9a9 testing commit 397a88b2cc869c823bf40bc403d36a62afec1edd compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 523f26757a0b1635ef1b37b39354fed591a34081fc8d47dc90bbd3df04d85587 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: event already set 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: netlink read failed 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: short netlink write run #19: crashed: SYZFAIL: netlink_send_ext: netlink read failed testing current HEAD ed99bf0e81b558df39f7db2fa96d0228be4198c6 testing commit ed99bf0e81b558df39f7db2fa96d0228be4198c6 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: d4658fbc9a88f0cf159d824dfe9e3894eb7d8eaa8585806313fb0343e116e69f all runs: crashed: unregister_netdevice: waiting for DEV to become free revisions tested: 2, total time: 24m57.127411356s (build: 17m55.396492692s, test: 6m33.125703292s) the crash still happens on HEAD commit msg: Linux 4.14.250 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: hci4 command 0x041b tx timeout Bluetooth: hci2 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: hci2 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci4 command 0x0419 tx timeout Bluetooth: hci2 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