SYZFAIL: netlink_send_ext: bad netlink ack type

Status: auto-obsoleted due to no activity on 2025/10/24 18:58
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+0c30d132335257429034@syzkaller.appspotmail.com
First crash: 1153d, last: 387d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (1)
Date Name Commit Repro Result
2023/06/11 upstream (ToT) 4c605260bc60 syz [report] SYZFAIL: netlink_send_ext: bad netlink ack type
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
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
linux-4.19 SYZFAIL: netlink_send_ext: bad netlink ack type -1 syz error 20 1611d 1991d 0/1 upstream: reported syz repro on 2021/02/23 18:14
▶ ▼ Last patch testing requests (5)
Created Duration User Patch Repo Result
2025/09/25 16:43 16m retest repro linux-5.15.y OK log
2025/07/16 18:42 15m retest repro linux-5.15.y report log
2025/05/05 20:21 1h20m retest repro linux-5.15.y report log
2025/02/23 11:11 18m retest repro linux-5.15.y report log
2024/12/15 05:59 16m retest repro linux-5.15.y report log

Sample crash report:
1970/01/01 00:11:15 [FATAL] executor failed 11 times: executor 0: exit status 67
SYZFAIL: netlink_send_ext: bad netlink ack type
type=41 (errno 22: Invalid argument)
SYZFAIL: child failed
 (errno 0: Success)
loop exited with status 67

SYZFAIL: netlink_send_ext: bad netlink ack type
type=41 (errno 22: Invalid argument)
SYZFAIL: child failed
 (errno 0: Success)
loop exited with status 67

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/06/11 19:55 linux-5.15.y 7349e40704a0 49519f06 .config console log report syz [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 SYZFAIL: netlink_send_ext: bad netlink ack type
* Struck through repros no longer work on HEAD.