bisecting fixing commit since 2d19be4653f5e74ed95560b69f94eb6791d49af3 building syzkaller on 06ed56cd22e24a55c40d152880b66b108834c8f2 testing commit 2d19be4653f5e74ed95560b69f94eb6791d49af3 with gcc (GCC) 8.4.1 20210217 kernel signature: ee5ceeae5ddfdea9985bd0d259fe14bca30f4fe5b7c1ae69e1657776b679f78b run #0: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #1: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #2: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #3: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #4: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #5: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #6: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #7: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #8: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #9: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #10: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #11: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #12: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #13: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #14: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #15: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #16: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #17: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type run #18: OK run #19: OK testing current HEAD 6b7b0056defc6eb5c87bbe4690ccda547b2891aa testing commit 6b7b0056defc6eb5c87bbe4690ccda547b2891aa with gcc (GCC) 8.4.1 20210217 kernel signature: efb9c94113d4215537f21d72f58e285a666dce52bc0b49f6c1d45790962a6cb0 all runs: crashed: SYZFAIL: netlink_send_ext: bad netlink ack type revisions tested: 2, total time: 39m46.996845187s (build: 23m41.402675363s, test: 15m19.757771186s) the crash still happens on HEAD commit msg: Linux 4.19.192 crash: SYZFAIL: netlink_send_ext: bad netlink ack type 2021/05/30 03:40:13 result: hanged=false err=executor 0: exit status 67 SYZFAIL: netlink_send_ext: bad netlink ack type type=35 (errno 22: Invalid argument) SYZFAIL: child failed (errno 0: Success) loop exited with status 67 SYZFAIL: netlink_send_ext: bad netlink ack type type=35 (errno 22: Invalid argument) SYZFAIL: child failed (errno 0: Success) loop exited with status 67 2021/05/30 03:40:16 executed programs: 3456 2021/05/30 03:40:21 executed programs: 3539