------------[ cut here ]------------
WARNING: CPU: 0 PID: 5471 at net/ipv6/ip6_output.c:1799 __ip6_append_data.isra.0+0x1beb/0x47f0 net/ipv6/ip6_output.c:1799
Modules linked in:
CPU: 0 PID: 5471 Comm: syz-executor.0 Not tainted 6.6.0-rc1-syzkaller-00205-g4a0f07d71b04 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:__ip6_append_data.isra.0+0x1beb/0x47f0 net/ipv6/ip6_output.c:1799
Code: db f6 ff ff e8 b6 99 96 f8 49 8d 44 24 ff 48 89 44 24 60 49 8d 6c 24 07 e9 c2 f6 ff ff 4c 8b b4 24 90 01 00 00 e8 95 99 96 f8 <0f> 0b 48 8b 44 24 10 45 89 f4 48 8d 98 74 02 00 00 e8 7f 99 96 f8
RSP: 0018:ffffc90004e7f3b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000001004 RCX: 0000000000000000
RDX: ffff88801cf41dc0 RSI: ffffffff88f134eb RDI: 0000000000000006
RBP: 0000000000001000 R08: 0000000000000006 R09: 0000000000001004
R10: 0000000000001000 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000001004 R15: ffff88802020eb40
FS:  00007f39ce7a96c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e76ea0440 CR3: 0000000024046000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ip6_append_data+0x1e6/0x510 net/ipv6/ip6_output.c:1894
 l2tp_ip6_sendmsg+0xdf9/0x1cc0 net/l2tp/l2tp_ip6.c:631
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:840
 sock_sendmsg_nosec net/socket.c:730 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:753
 splice_to_socket+0xade/0x1010 fs/splice.c:881
 do_splice_from fs/splice.c:933 [inline]
 direct_splice_actor+0x118/0x180 fs/splice.c:1142
 splice_direct_to_actor+0x347/0xa30 fs/splice.c:1088
 do_splice_direct+0x1af/0x280 fs/splice.c:1194
 do_sendfile+0xb88/0x1390 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x1d6/0x220 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f39cda7cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f39ce7a90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f39cdb9bf80 RCX: 00007f39cda7cae9
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 00007f39cdac847a R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000a006 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f39cdb9bf80 R15: 00007fff6ac615b8
 </TASK>