linux-kernel - Re: [syzbot] [netfilter?] WARNING in __nf_unregister_net

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Date: Sat, 17 Feb 2024 04:55:02 -0800
From: syzbot <syzbot+de4025c006ec68ac56fc@...kaller.appspotmail.com>
To: fw@...len.de, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [netfilter?] WARNING in __nf_unregister_net_hook (6)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
WARNING in __nf_unregister_net_hook

------------[ cut here ]------------
hook not found, pf 2 num 1
WARNING: CPU: 1 PID: 5828 at net/netfilter/core.c:517 __nf_unregister_net_hook+0x1de/0x670 net/netfilter/core.c:517
Modules linked in:
CPU: 1 PID: 5828 Comm: syz-executor.3 Not tainted 6.8.0-rc3-syzkaller-00211-g84443741faab #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:__nf_unregister_net_hook+0x1de/0x670 net/netfilter/core.c:517
Code: 14 02 4c 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 7a 04 00 00 8b 53 1c 48 c7 c7 a0 ab ab 8b 8b 74 24 04 e8 b2 64 c6 f8 <0f> 0b e9 ec 00 00 00 e8 f6 f9 00 f9 48 89 e8 48 c1 e0 04 49 8d 7c
RSP: 0018:ffffc90003c272b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff88807dd4da00 RCX: ffffffff814d93f9
RDX: ffff88802c4c9dc0 RSI: ffffffff814d9406 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880699cad90
R13: ffff8880648246f8 R14: ffff888064824660 R15: ffff88807dd4da1c
FS:  00007f51415d46c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f51415b3d58 CR3: 000000007fa81000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nf_unregister_net_hook+0xd5/0x110 net/netfilter/core.c:539
 __nf_tables_unregister_hook net/netfilter/nf_tables_api.c:362 [inline]
 __nf_tables_unregister_hook+0x1a0/0x220 net/netfilter/nf_tables_api.c:341
 nf_tables_unregister_hook net/netfilter/nf_tables_api.c:369 [inline]
 nf_tables_commit+0x3cdb/0x5ae0 net/netfilter/nf_tables_api.c:10174
 nfnetlink_rcv_batch+0xf3b/0x2510 net/netfilter/nfnetlink.c:569
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:639 [inline]
 nfnetlink_rcv+0x3bf/0x430 net/netfilter/nfnetlink.c:657
 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
 netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367
 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0xd5/0x180 net/socket.c:745
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x78/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f514087cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f51415d40c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f514099c050 RCX: 00007f514087cae9
RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000004
RBP: 00007f51408c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f514099c050 R15: 00007ffd31c3ba48
 </TASK>


Tested on:

commit:         84443741 netfilter: nf_tables: fix bidirectional offlo..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf.git main
console output: https://syzkaller.appspot.com/x/log.txt?x=11a08ae8180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=52f6b87f61a6b59c
dashboard link: https://syzkaller.appspot.com/bug?extid=de4025c006ec68ac56fc
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.