WARNING: CPU: 0 PID: 7004 at net/netfilter/nf_conntrack_seqadj.c:43 nf_ct_seqadj_set+0x337/0x340 net/netfilter/nf_conntrack_seqadj.c:43 Modules linked in: CPU: 0 PID: 7004 Comm: syz.0.507 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:nf_ct_seqadj_set+0x337/0x340 net/netfilter/nf_conntrack_seqadj.c:43 Code: 8c 73 fe ff ff 4c 89 ef e8 76 ec 8b f9 e9 66 fe ff ff e8 4c a4 46 f9 c6 05 4b e1 26 06 01 48 c7 c7 80 34 26 8b e8 79 00 8c 01 <0f> 0b e9 da fe ff ff 66 90 55 41 57 41 56 41 55 41 54 53 89 cb 89 RSP: 0018:ffffc9000357ebb0 EFLAGS: 00010246 RAX: 568442531f038300 RBX: ffff888079019200 RCX: 0000000000080000 RDX: ffffc9000ea5d000 RSI: 0000000000004e70 RDI: 0000000000004e71 RBP: 0000000000000001 R08: ffff8880b8e33d7f R09: 1ffff110171c67af R10: dffffc0000000000 R11: ffffed10171c67b0 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000002 FS: 00007f71d35e36c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff32d0efe8 CR3: 000000005ef72000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __nf_nat_mangle_tcp_packet+0x2be/0x510 net/netfilter/nf_nat_helper.c:118 nf_nat_mangle_tcp_packet include/net/netfilter/nf_nat_helper.h:26 [inline] ip_vs_ftp_out+0xae5/0xf30 net/netfilter/ipvs/ip_vs_ftp.c:381 app_tcp_pkt_out net/netfilter/ipvs/ip_vs_app.c:392 [inline] ip_vs_app_pkt_out+0x5ab/0xac0 net/netfilter/ipvs/ip_vs_app.c:424 tcp_snat_handler+0x5fc/0xa50 net/netfilter/ipvs/ip_vs_proto_tcp.c:174 handle_response+0x2da/0x730 net/netfilter/ipvs/ip_vs_core.c:1275 ip_vs_out+0x58b/0xeb0 net/netfilter/ipvs/ip_vs_core.c:1406 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584 nf_hook+0x205/0x360 include/linux/netfilter.h:257 __ip_local_out+0x4b7/0x5e0 net/ipv4/ip_output.c:115 ip_local_out net/ipv4/ip_output.c:124 [inline] __ip_queue_xmit+0x1120/0x1c60 net/ipv4/ip_output.c:538 __tcp_transmit_skb+0x1ca3/0x31e0 net/ipv4/tcp_output.c:1404 tcp_transmit_skb net/ipv4/tcp_output.c:1422 [inline] tcp_write_xmit+0x1a8d/0x65c0 net/ipv4/tcp_output.c:2718 __tcp_push_pending_frames+0x92/0x250 net/ipv4/tcp_output.c:2903 tcp_sendmsg_locked+0x2bdd/0x3330 net/ipv4/tcp.c:1432 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1460 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1090 call_write_iter include/linux/fs.h:2179 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x748/0xd70 fs/read_write.c:594 ksys_write+0x153/0x260 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f71d53adb19 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f71d35e3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f71d5634090 RCX: 00007f71d53adb19 RDX: 0000000000000029 RSI: 0000200000000240 RDI: 0000000000000007 RBP: 00007f71d5445af8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f71d5634128 R14: 00007f71d5634090 R15: 00007ffcc028caa8 </TASK>