Message-ID: <000000000000497c3c060175aed9@google.com>
Date:   Thu, 27 Jul 2023 03:46:47 -0700
From:   syzbot <syzbot+ff6e85a2812073da0a36@...kaller.appspotmail.com>
To:     bpf@...r.kernel.org, coreteam@...filter.org, davem@...emloft.net,
        edumazet@...gle.com, fw@...len.de, 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 __nf_conntrack_confirm

Hello,

syzbot found the following issue on:

HEAD commit:    15cec633fc7b net: fec: tx processing does not call XDP API..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=17fbd745a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=77b9a3cf8f44c6da
dashboard link: https://syzkaller.appspot.com/bug?extid=ff6e85a2812073da0a36
compiler:       gcc (Debian 12.2.0-14) 12.2.0, 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/cfb97ef3ebf9/disk-15cec633.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2e8df2be69d2/vmlinux-15cec633.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2bdf17720191/bzImage-15cec633.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ff6e85a2812073da0a36@...kaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 1 PID: 12 at net/netfilter/nf_conntrack_core.c:1198 __nf_conntrack_confirm+0x867/0x12c0 net/netfilter/nf_conntrack_core.c:1198
Modules linked in:
CPU: 1 PID: 12 Comm: kworker/u4:1 Not tainted 6.5.0-rc2-syzkaller-00231-g15cec633fc7b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: events_unbound macvlan_process_broadcast
RIP: 0010:__nf_conntrack_confirm+0x867/0x12c0 net/netfilter/nf_conntrack_core.c:1198
Code: df e8 5d 64 ff ff 31 ff 41 89 c4 89 c6 e8 91 b5 1c f9 45 84 e4 0f 84 7a ff ff ff 44 8b 7c 24 18 e9 3b fe ff ff e8 49 ba 1c f9 <0f> 0b 48 8b 7c 24 20 e8 bd f6 cb 01 44 8b 74 24 44 8b 5c 24 38 44
RSP: 0018:ffffc900001e08b0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888077a75bc0 RCX: 0000000000000100
RDX: ffff888015265940 RSI: ffffffff8869b667 RDI: 0000000000000001
RBP: 000000000001e698 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000004f10 R12: ffff888077a75b00
R13: 0000000000000001 R14: 000000000001e698 R15: 00000000000038d1
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fea3059d988 CR3: 000000004f78b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline]
 nf_confirm+0xfae/0x1200 net/netfilter/nf_conntrack_proto.c:155
 nf_hook_entry_hookfn include/linux/netfilter.h:143 [inline]
 nf_hook_slow+0xbf/0x1e0 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:258 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 ip_local_deliver+0x2f1/0x540 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:468 [inline]
 ip_rcv_finish+0x1c4/0x2e0 net/ipv4/ip_input.c:449
 NF_HOOK include/linux/netfilter.h:303 [inline]
 NF_HOOK include/linux/netfilter.h:297 [inline]
 ip_rcv+0xc8/0x410 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x115/0x180 net/core/dev.c:5452
 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5566
 process_backlog+0x101/0x6c0 net/core/dev.c:5894
 __napi_poll.constprop.0+0xb4/0x530 net/core/dev.c:6460
 napi_poll net/core/dev.c:6527 [inline]
 net_rx_action+0x956/0xe90 net/core/dev.c:6660
 __do_softirq+0x218/0x965 kernel/softirq.c:553
 do_softirq kernel/softirq.c:454 [inline]
 do_softirq+0xaa/0xe0 kernel/softirq.c:441
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:381
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 netif_rx net/core/dev.c:4972 [inline]
 netif_rx+0x332/0x420 net/core/dev.c:4961
 macvlan_broadcast+0x37d/0x680 drivers/net/macvlan.c:290
 macvlan_multicast_rx drivers/net/macvlan.c:302 [inline]
 macvlan_multicast_rx+0xd6/0x100 drivers/net/macvlan.c:296
 macvlan_process_broadcast+0x225/0x690 drivers/net/macvlan.c:338
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
 worker_thread+0x687/0x1110 kernel/workqueue.c:2748
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:296
RIP: 0000:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0000:0000000000000000 EFLAGS: 00000000 ORIG_RAX: 0000000000000000
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
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