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AFNElJ/n7PkBSWj+iBlXGSfhBoBJXuEAHhdhduZDL5DEYKoiw4poOoZcCLBD12Zgu2yFFGuil2T8sjU=@vger.kernel.org X-Gm-Message-State: AOJu0YzopDQzpCdqWEF7PgARgoP0TdjspnSUaUsa78D3V+5rnydTXsTD NMe+kGqrtdMcQTUnKHc/50vCFPtkv95fbyrNJ+nZMqXTg5R3xIdznehZcUyusvl+4R2x0iQRFCs TkvYGwxnJJjcvmkRVByKwFPe0y3E2CzkddnLooQ4TM1ZRrJjQe8Yuu8KBUwg= Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:6718:b0:485:5982:4cfc with SMTP id 5614622812f47-49079492366mr2337970b6e.33.1782303272549; Wed, 24 Jun 2026 05:14:32 -0700 (PDT) Date: Wed, 24 Jun 2026 05:14:32 -0700 In-Reply-To: <20260624073209.3703492-1-edumazet@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a3bca28.92e8a34c.2b91f1.0008.GAE@google.com> Subject: [syzbot ci] Re: net: clear transport header during tunnel decapsulation From: syzbot ci To: davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, eric.dumazet@gmail.com, horms@kernel.org, idosch@nvidia.com, kuba@kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzbot@syzkaller.appspotmail.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] net: clear transport header during tunnel decapsulation https://lore.kernel.org/all/20260624073209.3703492-1-edumazet@google.com * [PATCH net] net: clear transport header during tunnel decapsulation and found the following issue: WARNING in geneve_udp_encap_recv Full report is available here: https://ci.syzbot.org/series/1f6dc47e-354f-4904-bc18-c2b7ea4d79b2 *** WARNING in geneve_udp_encap_recv tree: net URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git base: d87363b0edfc7504ff2b144fe4cdd8154f90f42e arch: amd64 compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6 config: https://ci.syzbot.org/builds/7bb83c16-d55d-4d99-8c2b-6050e0022ef6/config ------------[ cut here ]------------ !skb_transport_header_was_set(skb) WARNING: ./include/linux/skbuff.h:3094 at geneve_udp_encap_recv+0x26ed/0x4130, CPU#1: kworker/1:3/5072 Modules linked in: CPU: 1 UID: 0 PID: 5072 Comm: kworker/1:3 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: mld mld_ifc_work RIP: 0010:geneve_udp_encap_recv+0x26ed/0x4130 Code: c8 00 00 00 0f b6 04 01 84 c0 0f 85 f2 18 00 00 48 8b 7c 24 78 66 44 89 6f 0a e8 7e 9b 7a 03 e9 8c 00 00 00 e8 f4 fc 33 fb 90 <0f> 0b 90 e9 2e e3 ff ff 49 83 c6 06 4c 89 f0 48 c1 e8 03 48 b9 00 RSP: 0018:ffffc90000a08620 EFLAGS: 00010246 RAX: ffffffff8691f92c RBX: ffff8881bcc8b5d0 RCX: ffff88816a7abb80 RDX: 0000000000000100 RSI: 000000000000ffff RDI: 000000000000ffff RBP: ffffc90000a08790 R08: ffffffff903114f7 R09: 1ffffffff206229e R10: dffffc0000000000 R11: fffffbfff206229f R12: ffff888109f6a108 R13: 1ffff110213ed5df R14: 0000000000000010 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8882a927b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6956ea5440 CR3: 000000016f55c000 CR4: 00000000000006f0 Call Trace: udp_queue_rcv_one_skb+0xfc5/0x10e0 udp_unicast_rcv_skb+0x21a/0x3a0 udp_rcv+0xecb/0x1db0 ip_protocol_deliver_rcu+0x27e/0x440 ip_local_deliver_finish+0x3bb/0x6f0 NF_HOOK+0x336/0x3c0 NF_HOOK+0x336/0x3c0 process_backlog+0xa34/0x1860 __napi_poll+0xaa/0x330 net_rx_action+0x61d/0xf50 handle_softirqs+0x225/0x840 do_softirq+0x76/0xd0 __local_bh_enable_ip+0xf8/0x130 __dev_queue_xmit+0x1ed7/0x37f0 ip6_output+0x337/0x540 NF_HOOK+0x177/0x4f0 mld_sendpack+0x890/0xe10 mld_ifc_work+0x839/0xe70 process_scheduled_works+0xa8e/0x14e0 worker_thread+0xa47/0xfb0 kthread+0x388/0x470 ret_from_fork+0x514/0xb70 ret_from_fork_asm+0x1a/0x30 *** 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.