SYZFAIL: netlink_send_ext: bad netlink ack type

Status: upstream: reported syz repro on 2021/02/23 18:14
Reported-by: syzbot+e608200462ab5329a493@syzkaller.appspotmail.com
First crash: 1991d, last: 1611d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 SYZFAIL: netlink_send_ext: bad netlink ack type origin:upstream -1 syz error 1 387d 1153d 0/3 auto-obsoleted due to no activity on 2025/10/24 18:58
linux-4.14 SYZFAIL: netlink_send_ext: bad netlink ack type -1 1 1964d 1964d 0/1 auto-closed as invalid on 2021/07/21 03:33
linux-6.1 SYZFAIL: netlink_send_ext: bad netlink ack type origin:upstream -1 syz error 1 872d 1154d 0/3 auto-obsoleted due to no activity on 2025/09/10 04:42
upstream SYZFAIL: netlink_send_ext: bad netlink ack type wireless -1 syz inconclusive inconclusive 150 359d 1993d 0/29 auto-obsoleted due to no activity on 2025/11/12 02:25
▶ ▼ Fix bisection attempts (7)
Created Duration User Patch Repo Result
2021/10/31 18:26 10m bisect fix linux-4.19.y error job log
2021/09/27 06:40 32m bisect fix linux-4.19.y OK (0) job log log
2021/08/28 06:02 37m bisect fix linux-4.19.y OK (0) job log log
2021/07/29 05:02 31m bisect fix linux-4.19.y OK (0) job log log
2021/06/29 03:40 29m bisect fix linux-4.19.y OK (0) job log log
2021/05/30 03:00 40m bisect fix linux-4.19.y OK (0) job log log
2021/04/30 01:56 28m bisect fix linux-4.19.y OK (0) job log log

Sample crash report:
2022/03/10 17:06:21 executor failed 11 times: 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

Crashes (20):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/03/10 17:17 linux-4.19.y 3f8a27f9e27b 9e8eaa75 .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/03/02 17:14 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/02/28 13:59 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/01/24 00:21 linux-4.19.y 3f8a27f9e27b 214351e1 .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2021/03/04 00:08 linux-4.19.y 2d19be4653f5 06ed56cd .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2021/03/01 06:25 linux-4.19.y 2d19be4653f5 4c37c133 .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2021/02/25 06:25 linux-4.19.y 2d19be4653f5 fcc6d71b .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2021/02/24 08:31 linux-4.19.y 2d19be4653f5 fcc6d71b .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2021/02/23 18:14 linux-4.19.y 2d19be4653f5 fcc6d71b .config console log report syz ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/03/08 11:41 linux-4.19.y 3f8a27f9e27b 7bdd8b2c .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/03/06 15:03 linux-4.19.y 3f8a27f9e27b 7bdd8b2c .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/03/04 23:00 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/03/04 07:41 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/03/03 05:28 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/02/28 22:28 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/02/28 09:30 linux-4.19.y 3f8a27f9e27b 45a13a73 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/02/13 21:49 linux-4.19.y 3f8a27f9e27b 8b9ca619 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/01/26 08:32 linux-4.19.y 3f8a27f9e27b 2cbffd88 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2022/01/23 19:56 linux-4.19.y 3f8a27f9e27b 214351e1 .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
2021/03/31 01:56 linux-4.19.y 2034d6f0838e 6a81331a .config console log report info ci2-linux-4-19 SYZFAIL: netlink_send_ext: bad netlink ack type
* Struck through repros no longer work on HEAD.