netdev - [syzbot] [netfilter?] WARNING in dev_setup

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Message-ID: <67cb88d1.050a0220.d8275.022d.GAE@google.com>
Date: Fri, 07 Mar 2025 16:01:21 -0800
From: syzbot <syzbot+0afb4bcf91e5a1afdcad@...kaller.appspotmail.com>
To: coreteam@...filter.org, davem@...emloft.net, edumazet@...gle.com, 
	horms@...nel.org, kadlec@...filter.org, kuba@...nel.org, 
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, 
	netfilter-devel@...r.kernel.org, pabeni@...hat.com, pablo@...filter.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [netfilter?] WARNING in dev_setup_tc

Hello,

syzbot found the following issue on:

HEAD commit:    865eddcf0afb Merge branch 'mlx5-misc-enhancements-2025-03-..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12fcc878580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fbc61e4c6e816b7b
dashboard link: https://syzkaller.appspot.com/bug?extid=0afb4bcf91e5a1afdcad
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/15388530d696/disk-865eddcf.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/dfd22998e59b/vmlinux-865eddcf.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ecc6b8f2a90d/bzImage-865eddcf.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0afb4bcf91e5a1afdcad@...kaller.appspotmail.com

------------[ cut here ]------------
RTNL: assertion failed at net/core/dev.c (1769)
WARNING: CPU: 1 PID: 10093 at net/core/dev.c:1769 dev_setup_tc+0x315/0x360 net/core/dev.c:1769
Modules linked in:
CPU: 1 UID: 0 PID: 10093 Comm: syz.2.1168 Not tainted 6.14.0-rc5-syzkaller-01096-g865eddcf0afb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:dev_setup_tc+0x315/0x360 net/core/dev.c:1769
Code: cc 49 89 ee e8 dc da f7 f7 c6 05 c0 39 5d 06 01 90 48 c7 c7 a0 5e 2e 8d 48 c7 c6 80 5e 2e 8d ba e9 06 00 00 e8 3c 97 b7 f7 90 <0f> 0b 90 90 e9 66 fd ff ff 89 d1 80 e1 07 38 c1 0f 8c aa fd ff ff
RSP: 0018:ffffc90003b8eed0 EFLAGS: 00010246
RAX: 587f1d6754f87800 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90010d68000 RSI: 00000000000049c3 RDI: 00000000000049c4
RBP: ffff8880250f8008 R08: ffffffff81818e32 R09: fffffbfff1d3a67c
R10: dffffc0000000000 R11: fffffbfff1d3a67c R12: ffffc90003b8f070
R13: ffffffff8d4ab1c0 R14: ffff8880250f8008 R15: ffff8880250f8000
FS:  00007f58e67f66c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000030ed6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nf_flow_table_offload_cmd net/netfilter/nf_flow_table_offload.c:1178 [inline]
 nf_flow_table_offload_setup+0x2ff/0x710 net/netfilter/nf_flow_table_offload.c:1198
 nft_register_flowtable_net_hooks+0x24c/0x570 net/netfilter/nf_tables_api.c:8918
 nf_tables_newflowtable+0x19f4/0x23d0 net/netfilter/nf_tables_api.c:9139
 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:524 [inline]
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:647 [inline]
 nfnetlink_rcv+0x14e3/0x2ab0 net/netfilter/nfnetlink.c:665
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x8de/0xcb0 net/netlink/af_netlink.c:1883
 sock_sendmsg_nosec net/socket.c:709 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:724
 ____sys_sendmsg+0x53a/0x860 net/socket.c:2564
 ___sys_sendmsg net/socket.c:2618 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2650
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f58e898d169
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:00007f58e67f6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f58e8ba6160 RCX: 00007f58e898d169
RDX: 0000000000000000 RSI: 0000400000000300 RDI: 000000000000000c
RBP: 00007f58e8a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f58e8ba6160 R15: 00007fff6c4048f8
 </TASK>


---
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