syzbot


WARNING in __nf_unregister_net_hook (9)

Status: upstream: reported on 2025/07/30 05:30
Subsystems: netfilter
[Documentation on labels]
Reported-by: syzbot+78ac1e46d2966eb70fda@syzkaller.appspotmail.com
First crash: 57d, last: 10d
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly netfilter report (Sep 2025) 0 (1) 2025/09/20 18:33
[syzbot] [netfilter?] WARNING in __nf_unregister_net_hook (9) 0 (1) 2025/07/30 05:30
Similar bugs (8)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in __nf_unregister_net_hook (4) netfilter -1 C error 66 1294d 1624d 20/29 fixed on 2022/03/08 16:11
upstream WARNING in __nf_unregister_net_hook netfilter -1 1 1976d 1972d 0/29 auto-closed as invalid on 2020/06/22 17:41
upstream WARNING in __nf_unregister_net_hook (6) netfilter -1 C error 2 587d 704d 25/29 fixed on 2024/03/26 17:39
upstream WARNING in __nf_unregister_net_hook (8) netfilter -1 2 161d 173d 28/29 fixed on 2025/06/10 16:19
upstream WARNING in __nf_unregister_net_hook (7) netfilter -1 2 347d 347d 0/29 auto-obsoleted due to no activity on 2025/01/17 09:21
upstream WARNING in __nf_unregister_net_hook (5) netfilter -1 183 1207d 1292d 0/29 auto-closed as invalid on 2022/07/31 13:33
upstream WARNING in __nf_unregister_net_hook (2) netfilter -1 C done 9 1896d 1895d 15/29 fixed on 2020/09/16 22:51
upstream WARNING in __nf_unregister_net_hook (3) netfilter -1 1 1830d 1830d 0/29 auto-closed as invalid on 2020/12/16 11:13

Sample crash report:
------------[ cut here ]------------
hook not found, pf 2 num 3
WARNING: CPU: 0 PID: 24790 at net/netfilter/core.c:514 __nf_unregister_net_hook+0x30a/0x700 net/netfilter/core.c:514
Modules linked in:
CPU: 0 UID: 0 PID: 24790 Comm: syz.3.5667 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__nf_unregister_net_hook+0x30a/0x700 net/netfilter/core.c:514
Code: e2 d5 e3 05 01 90 48 8b 44 24 10 0f b6 04 28 84 c0 0f 85 e3 03 00 00 41 8b 17 48 c7 c7 c0 c1 99 8c 44 89 ee e8 d7 95 d9 f7 90 <0f> 0b 90 90 e9 d8 01 00 00 e8 48 ea d0 01 89 c3 31 ff 89 c6 e8 ed
RSP: 0018:ffffc90012de6f10 EFLAGS: 00010246
RAX: fa62a82776b8a800 RBX: ffff8880206e1c00 RCX: 0000000000080000
RDX: ffffc9000c9cd000 RSI: 0000000000001819 RDI: 000000000000181a
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa1f4 R12: ffff88802d150000
R13: 0000000000000002 R14: ffff88802d151260 R15: ffff8880784e083c
FS:  00007f32a04836c0(0000) GS:ffff888125c14000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f32a0482f98 CR3: 000000009ec2e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __nf_tables_unregister_hook net/netfilter/nf_tables_api.c:414 [inline]
 nf_tables_unregister_hook net/netfilter/nf_tables_api.c:421 [inline]
 nft_table_disable+0x37e/0x440 net/netfilter/nf_tables_api.c:1348
 nf_tables_table_disable net/netfilter/nf_tables_api.c:1380 [inline]
 nf_tables_commit+0x5458/0x8700 net/netfilter/nf_tables_api.c:10987
 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:574 [inline]
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
 nfnetlink_rcv+0x1a4b/0x2520 net/netfilter/nfnetlink.c:665
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f329f58eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f32a0483038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f329f7d5fa0 RCX: 00007f329f58eba9
RDX: 0000000000002000 RSI: 0000200000000100 RDI: 0000000000000003
RBP: 00007f329f611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f329f7d6038 R14: 00007f329f7d5fa0 R15: 00007ffc6b2421a8
 </TASK>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/09/11 02:59 net-next 38611e5adae3 fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in __nf_unregister_net_hook
2025/09/11 02:59 net-next 38611e5adae3 fdeaa69b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in __nf_unregister_net_hook
2025/07/26 05:18 net-next 9312ee76490d fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce WARNING in __nf_unregister_net_hook
* Struck through repros no longer work on HEAD.