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

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Message-ID: <000000000000f10406060a93dc78@google.com>
Date:   Mon, 20 Nov 2023 03:34:03 -0800
From:   syzbot <syzbot+de4025c006ec68ac56fc@...kaller.appspotmail.com>
To:     eadavis@...a.com, 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: 0 PID: 5838 at net/netfilter/core.c:517 __nf_unregister_net_hook+0x1de/0x670 net/netfilter/core.c:517
Modules linked in:

CPU: 0 PID: 5838 Comm: syz-executor.0 Not tainted 6.6.0-rc3-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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 c0 d4 a8 8b 8b 74 24 04 e8 b2 ce dc f8 <0f> 0b e9 ec 00 00 00 e8 46 a5 16 f9 48 89 e8 48 c1 e0 04 49 8d 7c
RSP: 0018:ffffc90003e8f2b8 EFLAGS: 00010282

RAX: 0000000000000000 RBX: ffff8880655a7800 RCX: 0000000000000000
RDX: ffff888020762000 RSI: ffffffff814cf016 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff888027c57290
R13: ffff888065865b98 R14: ffff888065865b00 R15: ffff8880655a781c
FS:  00007f3c5fffe6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c60d98000 CR3: 0000000079951000 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:361 [inline]
 __nf_tables_unregister_hook+0x1a0/0x220 net/netfilter/nf_tables_api.c:340
 nf_tables_unregister_hook net/netfilter/nf_tables_api.c:368 [inline]
 nf_tables_commit+0x410f/0x59f0 net/netfilter/nf_tables_api.c:9992
 nfnetlink_rcv_batch+0xf36/0x2500 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:1342 [inline]
 netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368
 netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910
 sock_sendmsg_nosec net/socket.c:730 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:753
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2541
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2595
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2624
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3c60c7cae9
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:00007f3c5fffe0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3c60d9c050 RCX: 00007f3c60c7cae9
RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003
RBP: 00007f3c60cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f3c60d9c050 R15: 00007fffd735cc38
 </TASK>


Tested on:

commit:         6465e260 Linux 6.6-rc3
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=127de958e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8d7d7928f78936aa
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
patch:          https://syzkaller.appspot.com/x/patch.diff?x=10447648e80000