From: syzbot ci <syzbot+ci8b43956da1b72f0c@syzkaller.appspotmail.com>
To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com,
horms@kernel.org, jiayuan.chen@linux.dev, kuba@kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
pabeni@redhat.com, pshelar@nicira.com,
syzbot@syzkaller.appspotmail.com, tom@herbertland.com
Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com
Subject: [syzbot ci] Re: net: tunnel: fix stale transport header after GRE/TEB decap
Date: Thu, 16 Apr 2026 00:04:42 -0700 [thread overview]
Message-ID: <69e08a0a.a70a0220.259bc5.0019.GAE@google.com> (raw)
In-Reply-To: <20260416034610.8873-1-jiayuan.chen@linux.dev>
syzbot ci has tested the following series
[v1] net: tunnel: fix stale transport header after GRE/TEB decap
https://lore.kernel.org/all/20260416034610.8873-1-jiayuan.chen@linux.dev
* [PATCH net v1 1/2] net: tunnel: fix stale transport header after GRE/TEB decap
* [PATCH net-next v1 2/2] net: add DEBUG_NET_WARN_ON_ONCE for negative transport offset
and found the following issue:
WARNING in udpv6_err
Full report is available here:
https://ci.syzbot.org/series/3886f2f1-a6d5-4c5c-8dc8-bc1cec577567
***
WARNING in udpv6_err
tree: net
URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git
base: 1f5ffc672165ff851063a5fd044b727ab2517ae3
arch: amd64
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
config: https://ci.syzbot.org/builds/06cf41a2-60fe-4f9b-8f68-57eb6d1e48cc/config
------------[ cut here ]------------
off < 0
WARNING: ./include/linux/skbuff.h:3239 at udpv6_err+0x1521/0x16d0, CPU#0: kworker/u9:2/51
Modules linked in:
CPU: 0 UID: 0 PID: 51 Comm: kworker/u9:2 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: wg-kex-wg0 wg_packet_handshake_send_worker
RIP: 0010:udpv6_err+0x1521/0x16d0
Code: f7 b0 01 89 44 24 30 49 bf 00 00 00 00 00 fc ff df e9 ea ef ff ff e8 8e f2 66 f7 90 0f 0b 90 e9 2a f9 ff ff e8 80 f2 66 f7 90 <0f> 0b 90 e9 bb f9 ff ff e8 72 f2 66 f7 90 0f 0b 90 e9 1a fa ff ff
RSP: 0018:ffffc900000074e0 EFLAGS: 00010246
RAX: ffffffff8a5e6c30 RBX: 0000000080000000 RCX: ffff888106e91d80
RDX: 0000000000000100 RSI: 0000000080000000 RDI: 0000000000000000
RBP: ffffc90000007670 R08: ffff88810be30ae0 R09: 000000000000234e
R10: 000000000000003c R11: ffffffff8a5e5710 R12: ffff888116513390
R13: ffff888114c38900 R14: fffffffffffffff8 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff88818dc43000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555561513898 CR3: 000000016fad2000 CR4: 00000000000006f0
Call Trace:
<IRQ>
icmpv6_notify+0x407/0x850
icmpv6_rcv+0x13b0/0x1d80
ip6_protocol_deliver_rcu+0xe37/0x1610
ip6_input_finish+0x191/0x370
NF_HOOK+0x336/0x3c0
ip6_input+0x16a/0x270
NF_HOOK+0x336/0x3c0
process_backlog+0x7dd/0x1950
__napi_poll+0xae/0x340
net_rx_action+0x627/0xf70
handle_softirqs+0x22a/0x840
do_softirq+0x76/0xd0
</IRQ>
<TASK>
__local_bh_enable_ip+0xf8/0x130
wg_socket_send_skb_to_peer+0x16b/0x1d0
wg_packet_handshake_send_worker+0x203/0x350
process_scheduled_works+0xb5d/0x1860
***
If these findings have caused you to resend the series or submit a
separate fix, please add the following tag to your commit message:
Tested-by: syzbot@syzkaller.appspotmail.com
---
This report is generated by a bot. It may contain errors.
syzbot ci engineers can be reached at syzkaller@googlegroups.com.
To test a patch for this bug, please reply with `#syz test`
(should be on a separate line).
The patch should be attached to the email.
Note: arguments like custom git repos and branches are not supported.
next prev parent reply other threads:[~2026-04-16 7:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-16 3:46 [PATCH net v1 1/2] net: tunnel: fix stale transport header after GRE/TEB decap Jiayuan Chen
2026-04-16 3:46 ` [PATCH net-next v1 2/2] net: add DEBUG_NET_WARN_ON_ONCE for negative transport offset Jiayuan Chen
2026-04-16 7:04 ` syzbot ci [this message]
2026-04-16 7:49 ` [syzbot ci] Re: net: tunnel: fix stale transport header after GRE/TEB decap Jiayuan Chen
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