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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1947:b0:3e5:83c5:fe10 with SMTP id e9e14a558f8ab-3e6764f2d64mr41844415ab.0.1755618096385; Tue, 19 Aug 2025 08:41:36 -0700 (PDT) Date: Tue, 19 Aug 2025 08:41:36 -0700 In-Reply-To: <20250818154032.3173645-1-sdf@fomichev.me> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <68a49b30.050a0220.e29e5.00c8.GAE@google.com> Subject: [syzbot ci] Re: net: Convert to skb_dstref_steal and skb_dstref_restore From: syzbot ci To: abhishektamboli9@gmail.com, andrew@lunn.ch, ayush.sawal@chelsio.com, coreteam@netfilter.org, davem@davemloft.net, dsahern@kernel.org, edumazet@google.com, fw@strlen.de, gregkh@linuxfoundation.org, herbert@gondor.apana.org.au, horms@kernel.org, kadlec@netfilter.org, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, mhal@rbox.co, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pabeni@redhat.com, pablo@netfilter.org, sdf@fomichev.me, steffen.klassert@secunet.com Cc: syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v2] net: Convert to skb_dstref_steal and skb_dstref_restore https://lore.kernel.org/all/20250818154032.3173645-1-sdf@fomichev.me * [PATCH net-next v2 1/7] net: Add skb_dstref_steal and skb_dstref_restore * [PATCH net-next v2 2/7] xfrm: Switch to skb_dstref_steal to clear dst_entry * [PATCH net-next v2 3/7] netfilter: Switch to skb_dstref_steal to clear dst_entry * [PATCH net-next v2 4/7] net: Switch to skb_dstref_steal/skb_dstref_restore for ip_route_input callers * [PATCH net-next v2 5/7] staging: octeon: Convert to skb_dst_drop * [PATCH net-next v2 6/7] chtls: Convert to skb_dst_reset * [PATCH net-next v2 7/7] net: Add skb_dst_check_unset and found the following issue: WARNING in nf_reject_fill_skb_dst Full report is available here: https://ci.syzbot.org/series/74fec874-bca1-42a5-bb58-f3f49b95e348 *** WARNING in nf_reject_fill_skb_dst tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 8159572936392b514e404bab2d60e47cebd5acfe 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/10161afb-c9c1-4272-851c-1ded15995879/config C repro: https://ci.syzbot.org/findings/7f681f6a-9952-49a0-8533-0bc185291f81/c_repro syz repro: https://ci.syzbot.org/findings/7f681f6a-9952-49a0-8533-0bc185291f81/syz_repro ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5862 at ./include/linux/skbuff.h:1165 skb_dst_check_unset include/linux/skbuff.h:1164 [inline] WARNING: CPU: 1 PID: 5862 at ./include/linux/skbuff.h:1165 skb_dst_set include/linux/skbuff.h:1211 [inline] WARNING: CPU: 1 PID: 5862 at ./include/linux/skbuff.h:1165 nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234 Modules linked in: CPU: 1 UID: 0 PID: 5862 Comm: kworker/u8:2 Not tainted 6.17.0-rc1-syzkaller-00207-g815957293639-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:skb_dst_check_unset include/linux/skbuff.h:1164 [inline] RIP: 0010:skb_dst_set include/linux/skbuff.h:1211 [inline] RIP: 0010:nf_reject_fill_skb_dst+0x2a4/0x330 net/ipv4/netfilter/nf_reject_ipv4.c:234 Code: 8b 0d 60 75 8b 08 48 3b 8c 24 e0 00 00 00 75 5d 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 03 91 67 01 cc e8 ad d0 aa f7 90 <0f> 0b 90 e9 38 ff ff ff 44 89 f9 80 e1 07 fe c1 38 c1 0f 8c 2b fe RSP: 0018:ffffc900001e0360 EFLAGS: 00010246 RAX: ffffffff8a14dae3 RBX: ffff88810f943b00 RCX: ffff888109618000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900001e0490 R08: ffffffff8fa37e37 R09: 1ffffffff1f46fc6 R10: dffffc0000000000 R11: fffffbfff1f46fc7 R12: ffff88810ec56101 R13: dffffc0000000001 R14: 1ffff9200003c070 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881a3c1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000002f6a520 CR3: 0000000027716000 CR4: 00000000000006f0 Call Trace: nf_send_unreach+0x17b/0x6e0 net/ipv4/netfilter/nf_reject_ipv4.c:325 nft_reject_inet_eval+0x4bc/0x690 net/netfilter/nft_reject_inet.c:27 expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline] nft_do_chain+0x40c/0x1920 net/netfilter/nf_tables_core.c:285 nft_do_chain_inet+0x25d/0x340 net/netfilter/nft_chain_filter.c:161 nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline] nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623 nf_hook include/linux/netfilter.h:273 [inline] NF_HOOK+0x206/0x3a0 include/linux/netfilter.h:316 __netif_receive_skb_one_core net/core/dev.c:5979 [inline] __netif_receive_skb+0x143/0x380 net/core/dev.c:6092 process_backlog+0x60e/0x14f0 net/core/dev.c:6444 __napi_poll+0xc7/0x360 net/core/dev.c:7494 napi_poll net/core/dev.c:7557 [inline] net_rx_action+0x707/0xe30 net/core/dev.c:7684 handle_softirqs+0x286/0x870 kernel/softirq.c:579 do_softirq+0xec/0x180 kernel/softirq.c:480 __local_bh_enable_ip+0x17d/0x1c0 kernel/softirq.c:407 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline] __dev_queue_xmit+0x1d79/0x3b50 net/core/dev.c:4740 neigh_output include/net/neighbour.h:547 [inline] ip6_finish_output2+0x11fe/0x16a0 net/ipv6/ip6_output.c:141 NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xb96/0x1470 net/ipv6/ndisc.c:512 ndisc_send_ns+0xcb/0x150 net/ipv6/ndisc.c:670 addrconf_dad_work+0xaae/0x14b0 net/ipv6/addrconf.c:4282 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 *** 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.