------------[ cut here ]------------
WARNING: CPU: 1 PID: 1013 at net/ipv6/ip6_output.c:1756 __ip6_append_data+0x3665/0x3bf0 net/ipv6/ip6_output.c:1756
Modules linked in:
CPU: 1 UID: 0 PID: 1013 Comm: syz.0.267 Not tainted syzkaller #0 053bc84e93bdef9c6c9615cbace6655003d8d143
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__ip6_append_data+0x3665/0x3bf0 net/ipv6/ip6_output.c:1756
Code: 00 be 04 00 00 00 e8 5a 33 e9 fc f0 ff 8b f4 01 00 00 eb 05 e8 dc 55 90 fc 8b 84 24 e0 01 00 00 e9 6d d0 ff ff e8 cb 55 90 fc <0f> 0b e9 c7 fe ff ff e8 bf 55 90 fc e9 4c ff ff ff e8 b5 55 90 fc
RSP: 0018:ffffc9000e26ef40 EFLAGS: 00010287
RAX: ffffffff84f72195 RBX: 000000000000003f RCX: 0000000000080000
RDX: ffffc900019e2000 RSI: 0000000000002271 RDI: 0000000000002272
RBP: ffffc9000e26f198 R08: ffff88811a6001a3 R09: 1ffff110234c0034
R10: dffffc0000000000 R11: ffffed10234c0035 R12: 00000000000005c0
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000054
FS:  00007f78ed59d6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f78ed59cff8 CR3: 000000011835e000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ip6_append_data+0x194/0x370 net/ipv6/ip6_output.c:1855
 udpv6_sendmsg+0x904/0x2800 net/ipv6/udp.c:1666
 inet6_sendmsg+0xef/0x120 net/ipv6/af_inet6.c:666
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg net/socket.c:727 [inline]
 sock_sendmsg+0x270/0x470 net/socket.c:750
 splice_to_socket+0xb8c/0x1290 fs/splice.c:889
 do_splice_from fs/splice.c:941 [inline]
 direct_splice_actor+0x279/0x4b0 fs/splice.c:1164
 splice_direct_to_actor+0x4fa/0xbf0 fs/splice.c:1108
 do_splice_direct_actor fs/splice.c:1207 [inline]
 do_splice_direct+0x196/0x290 fs/splice.c:1233
 do_sendfile+0x511/0xed0 fs/read_write.c:1400
 __do_sys_sendfile64 fs/read_write.c:1467 [inline]
 __se_sys_sendfile64 fs/read_write.c:1453 [inline]
 __x64_sys_sendfile64+0x19d/0x200 fs/read_write.c:1453
 x64_sys_call+0xa26/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:41
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f78ec79e159
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:00007f78ed59d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f78eca25fa0 RCX: 00007f78ec79e159
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f78ec83503b R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f78eca26038 R14: 00007f78eca25fa0 R15: 00007fff3cefbbc8
 </TASK>
---[ end trace 0000000000000000 ]---