------------[ cut here ]------------ memcpy: detected field-spanning write (size 56) of single field "&top_iph->saddr" at net/ipv6/ah6.c:439 (size 16) WARNING: CPU: 1 PID: 9847 at net/ipv6/ah6.c:439 ah6_output+0xec3/0x1500 net/ipv6/ah6.c:439 Modules linked in: CPU: 1 UID: 0 PID: 9847 Comm: syz.4.1069 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:ah6_output+0xec3/0x1500 net/ipv6/ah6.c:439 Code: ff e8 e1 42 7d f7 c6 05 ff 0f 4b 05 01 90 b9 10 00 00 00 48 c7 c7 80 66 a2 8c 4c 89 f6 48 c7 c2 e0 68 a2 8c e8 be e0 40 f7 90 <0f> 0b 90 90 e9 ab fe ff ff e8 6f fd 36 01 48 8b 4c 24 28 80 e1 07 RSP: 0018:ffffc9001d73e3e0 EFLAGS: 00010246 RAX: 370197a73d17fd00 RBX: ffff888059d8ec08 RCX: ffff88801dff3c00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffffc9001d73e570 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bfa1ec R12: dffffc0000000000 R13: 1ffff92003ae7c9c R14: 0000000000000038 R15: 0000000000000040 FS: 00007fe4df9836c0(0000) GS:ffff888125d1b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f202a7f5f98 CR3: 0000000033142000 CR4: 00000000003526f0 Call Trace: xfrm_output_one net/xfrm/xfrm_output.c:555 [inline] xfrm_output_resume+0x2c52/0x6170 net/xfrm/xfrm_output.c:590 __xfrm6_output+0x2ed/0x1070 net/ipv6/xfrm6_output.c:103 NF_HOOK_COND include/linux/netfilter.h:307 [inline] xfrm6_output+0x1c6/0x4f0 net/ipv6/xfrm6_output.c:108 NF_HOOK include/linux/netfilter.h:318 [inline] ip6_xmit+0x107a/0x1840 net/ipv6/ip6_output.c:367 sctp_v6_xmit+0xa33/0x1300 net/sctp/ipv6.c:248 sctp_packet_transmit+0x257e/0x2bb0 net/sctp/output.c:653 sctp_packet_singleton+0x233/0x330 net/sctp/outqueue.c:783 sctp_outq_flush_ctrl net/sctp/outqueue.c:914 [inline] sctp_outq_flush+0x4f0/0x3140 net/sctp/outqueue.c:1212 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:-1 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1204 [inline] sctp_do_sm+0x5332/0x5a20 net/sctp/sm_sideeffect.c:1175 sctp_primitive_ASSOCIATE+0x95/0xc0 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0x102d/0x1810 net/sctp/socket.c:1842 sctp_sendmsg+0x1941/0x2810 net/sctp/socket.c:2032 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x19c/0x270 net/socket.c:729 ____sys_sendmsg+0x52d/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmmsg+0x227/0x430 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2781 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe4deb8ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe4df983038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fe4dedb5fa0 RCX: 00007fe4deb8ebe9 RDX: 0000000000000001 RSI: 0000200000004800 RDI: 0000000000000003 RBP: 00007fe4dec11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000044 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe4dedb6038 R14: 00007fe4dedb5fa0 R15: 00007ffe41c82798