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Tue, 22 Jul 2025 17:55:48 -0700 (PDT) Date: Tue, 22 Jul 2025 17:55:48 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68803314.a70a0220.693ce.010e.GAE@google.com> Subject: [moderation/CI] Re: vrf: Drop existing dst reference in vrf_ip6_input_dst From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] vrf: Drop existing dst reference in vrf_ip6_input_dst https://lore.kernel.org/all/<20250722210256.143208-1-sdf@fomichev.me> * [PATCH net 1/2] vrf: Drop existing dst reference in vrf_ip6_input_dst * [PATCH net 2/2] net: Warn when overriding referenced dst entry and found the following issue: WARNING in nf_reject_fill_skb_dst Full report is available here: https://ci.syzbot.org/series/c92e1af5-3b8b-4c26-8104-acca93ad8939 *** WARNING in nf_reject_fill_skb_dst tree: net URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net.git base: cf074eca0065bc5142e6004ae236bb35a2687fdf arch: amd64 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 config: https://ci.syzbot.org/builds/235c4af3-77ea-4670-9c9e-9de1ef0a5aa6/config syz repro: https://ci.syzbot.org/findings/1038832f-72d8-4491-9ac9-28339d31f0f7/syz_repro ------------[ cut here ]------------ WARNING: CPU: 1 PID: 12 at ./include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x313/0x3b0 Modules linked in: CPU: 1 UID: 0 PID: 12 Comm: kworker/u8:0 Not tainted 6.16.0-rc6-syzkaller-00135-gcf074eca0065-dirty #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:nf_reject_fill_skb_dst+0x313/0x3b0 Code: 8b 0d f1 35 98 08 48 3b 8c 24 e0 00 00 00 75 6b 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 54 19 69 01 cc e8 9e 7e b8 f7 90 <0f> 0b 90 e9 43 ff ff ff e8 90 7e b8 f7 90 0f 0b 90 e9 e3 fe ff ff RSP: 0018:ffffc900001e0360 EFLAGS: 00010246 RAX: ffffffff8a07aa52 RBX: ffff888110f75500 RCX: ffff88801c2f5640 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900001e0490 R08: ffffffff8fa1d6f7 R09: 1ffffffff1f43ade R10: dffffc0000000000 R11: fffffbfff1f43adf R12: ffff888110f75501 R13: dffffc0000000001 R14: 1ffff9200003c070 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881a3c22000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000000c0 CR3: 000000001ff6e000 CR4: 00000000000006f0 Call Trace: nf_send_unreach+0x17b/0x700 nft_reject_inet_eval+0x4bc/0x690 nft_do_chain+0x40c/0x1920 nft_do_chain_inet+0x25d/0x340 nf_hook_slow+0xc5/0x220 NF_HOOK+0x206/0x3a0 __netif_receive_skb+0x143/0x380 process_backlog+0x60e/0x14f0 __napi_poll+0xc7/0x480 net_rx_action+0x707/0xe30 handle_softirqs+0x286/0x870 do_softirq+0xec/0x180 __local_bh_enable_ip+0x17d/0x1c0 __dev_queue_xmit+0x1cd7/0x3a70 ip6_finish_output2+0x11fe/0x16a0 ndisc_send_skb+0xc77/0x1500 ndisc_send_ns+0xcb/0x150 addrconf_dad_work+0xaae/0x14b0 process_scheduled_works+0xae1/0x17b0 worker_thread+0x8a0/0xda0 kthread+0x711/0x8a0 ret_from_fork+0x3fc/0x770 ret_from_fork_asm+0x1a/0x30 --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com. The email will later be sent to: [andrew@lunn.ch davem@davemloft.net dsahern@kernel.org edumazet@google.com horms@kernel.org kuba@kernel.org linux-kernel@vger.kernel.org netdev@vger.kernel.org pabeni@redhat.com sdf@fomichev.me] If the report looks fine to you, reply with: #syz upstream