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with SMTP id 5614622812f47-4d72cd31708mr15583967b6e.23.1790624491377; Mon, 28 Sep 2026 12:41:31 -0700 (PDT) Date: Mon, 28 Sep 2026 12:41:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6abac2eb.3654fce1.1bec97.0000.GAE@google.com> Subject: [syzbot] [net?] WARNING in __skb_flow_dissect (8) From: syzbot To: davem@davemloft.net, edumazet@google.com, horms@kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: e8e60d3ddd25 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=14800605580000 kernel config: https://syzkaller.appspot.com/x/.config?x=375776a45e10c065 dashboard link: https://syzkaller.appspot.com/bug?extid=9408fbe0e6452a12e9ab compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12800605580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=138b2605580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ca9fd6dc9b6c/disk-e8e60d3d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/690b32d87cdf/vmlinux-e8e60d3d.xz kernel image: https://storage.googleapis.com/syzbot-assets/35db39da550c/Image-e8e60d3d.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9408fbe0e6452a12e9ab@syzkaller.appspotmail.com tipc: Started in network mode tipc: Node identity ac14143b, cluster identity 4711 tipc: New replicast peer: 10.1.1.0 ------------[ cut here ]------------ WARNING: net/core/flow_dissector.c:1131 at __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126, CPU#1: syz.0.17/4912 Modules linked in: CPU: 1 UID: 0 PID: 4912 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126 lr : __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126 sp : ffff800094906200 x29: ffff800094906700 x28: 0000000000000000 x27: 0000000000000002 x26: 0000000000000000 x25: ffff0000d05fd3c0 x24: dfff800000000000 x23: 0000000000000000 x22: 1ffff0001114beb7 x21: ffff800088a5f5b0 x20: 0000000000000000 x19: ffff700012920c58 x18: 00000000ffffffff x17: ffff8000863d2120 x16: ffff8000863d32f4 x15: ffff80008a707000 x14: 000000000064059a x13: 0000000000000009 x12: 0000000000000009 x11: 00000000d6794b26 x10: 0000000000000003 x9 : 0000000000000400 x8 : 0000000000000000 x7 : ffff800084c05fcc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff800084c05fe8 x2 : 0000000000000001 x1 : ffff0000c46c9d80 x0 : 0000000000000000 Call trace: __skb_flow_dissect+0x910/0x5368 net/core/flow_dissector.c:1126 (P) __skb_get_hash_net+0xe0/0x29c net/core/flow_dissector.c:1903 skb_get_hash include/linux/skbuff.h:1663 [inline] seg6_make_flowlabel+0xcc/0x1ec net/ipv6/seg6_iptunnel.c:132 __seg6_do_srh_encap+0x320/0xbf4 net/ipv6/seg6_iptunnel.c:161 seg6_do_srh+0x4b4/0xa44 net/ipv6/seg6_iptunnel.c:431 seg6_output_core+0x164/0x688 net/ipv6/seg6_iptunnel.c:681 seg6_output+0x44/0x1ac net/ipv6/seg6_iptunnel.c:744 lwtunnel_output+0x3d0/0x664 net/core/lwtunnel.c:356 dst_output include/net/dst.h:470 [inline] ip_local_out+0x110/0x148 net/ipv4/ip_output.c:131 iptunnel_xmit+0x50c/0xd38 net/ipv4/ip_tunnel_core.c:97 udp_tunnel_xmit_skb+0x220/0x348 net/ipv4/udp_tunnel_core.c:187 tipc_udp_xmit+0x75c/0x9c0 net/tipc/udp_media.c:202 tipc_udp_send_msg+0x214/0x374 net/tipc/udp_media.c:274 tipc_bearer_xmit_skb+0x260/0x3b0 net/tipc/bearer.c:576 tipc_enable_bearer net/tipc/bearer.c:366 [inline] __tipc_nl_bearer_enable+0xc90/0xfb0 net/tipc/bearer.c:1048 tipc_nl_bearer_enable+0x2c/0x48 net/tipc/bearer.c:1057 genl_family_rcv_msg_doit+0x1e4/0x2d4 net/netlink/genetlink.c:1114 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline] genl_rcv_msg+0x43c/0x620 net/netlink/genetlink.c:1209 netlink_rcv_skb+0x238/0x414 net/netlink/af_netlink.c:2575 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1218 netlink_unicast_kernel net/netlink/af_netlink.c:1338 [inline] netlink_unicast+0x600/0x7f8 net/netlink/af_netlink.c:1364 netlink_sendmsg+0x648/0x948 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:800 [inline] __sock_sendmsg+0xc8/0x17c net/socket.c:815 ____sys_sendmsg+0x3d0/0x6c8 net/socket.c:2713 ___sys_sendmsg+0x198/0x224 net/socket.c:2767 __sys_sendmsg+0x158/0x204 net/socket.c:2799 __do_sys_sendmsg net/socket.c:2804 [inline] __se_sys_sendmsg net/socket.c:2802 [inline] __arm64_sys_sendmsg+0x88/0x9c net/socket.c:2802 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 irq event stamp: 1573 hardirqs last enabled at (1572): [] __local_bh_enable_ip+0x14c/0x234 kernel/softirq.c:478 hardirqs last disabled at (1573): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483 softirqs last enabled at (1546): [] __alloc_skb+0x1c0/0x610 net/core/skbuff.c:698 softirqs last disabled at (1552): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1552): [] tipc_udp_xmit+0xb8/0x9c0 net/tipc/udp_media.c:181 ---[ end trace 0000000000000000 ]--- tipc: Enabled bearer , priority 10 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup