=====================================================
BUG: KMSAN: uninit-value in ipv6_find_tlv+0x398/0x410 net/ipv6/exthdrs_core.c:147
 ipv6_find_tlv+0x398/0x410 net/ipv6/exthdrs_core.c:147
 ip6_find_1stfragopt+0x287/0x520 net/ipv6/output_core.c:84
 ip6_fragment+0x1d7/0x3dc0 net/ipv6/ip6_output.c:846
 __ip6_finish_output net/ipv6/ip6_output.c:193 [inline]
 ip6_finish_output+0xd0e/0x1230 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip6_output+0x396/0x640 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:451 [inline]
 ip6_local_out+0xe5/0x140 net/ipv6/output_core.c:161
 ip6_send_skb net/ipv6/ip6_output.c:1969 [inline]
 ip6_push_pending_frames+0x1f4/0x550 net/ipv6/ip6_output.c:1989
 rawv6_push_pending_frames+0xb12/0xb90 net/ipv6/raw.c:579
 rawv6_sendmsg+0x2ba7/0x2ea0 net/ipv6/raw.c:922
 inet_sendmsg+0x101/0x180 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 sock_write_iter+0x495/0x5e0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2187 [inline]
 aio_write+0x63a/0x950 fs/aio.c:1603
 io_submit_one+0x1a36/0x3ad0 fs/aio.c:2022
 __do_sys_io_submit fs/aio.c:2081 [inline]
 __se_sys_io_submit+0x293/0x770 fs/aio.c:2051
 __x64_sys_io_submit+0x92/0xd0 fs/aio.c:2051
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:732 [inline]
 slab_alloc_node mm/slub.c:3258 [inline]
 __kmalloc_node_track_caller+0x814/0x1250 mm/slub.c:4970
 kmalloc_reserve net/core/skbuff.c:362 [inline]
 __alloc_skb+0x346/0xcf0 net/core/skbuff.c:434
 alloc_skb include/linux/skbuff.h:1257 [inline]
 __ip6_append_data+0x51d5/0x6b80 net/ipv6/ip6_output.c:1682
 ip6_append_data+0x437/0x5b0 net/ipv6/ip6_output.c:1852
 rawv6_sendmsg+0x28dc/0x2ea0 net/ipv6/raw.c:915
 inet_sendmsg+0x101/0x180 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 sock_write_iter+0x495/0x5e0 net/socket.c:1108
 call_write_iter include/linux/fs.h:2187 [inline]
 aio_write+0x63a/0x950 fs/aio.c:1603
 io_submit_one+0x1a36/0x3ad0 fs/aio.c:2022
 __do_sys_io_submit fs/aio.c:2081 [inline]
 __se_sys_io_submit+0x293/0x770 fs/aio.c:2051
 __x64_sys_io_submit+0x92/0xd0 fs/aio.c:2051
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

CPU: 1 PID: 3514 Comm: syz-executor191 Not tainted 6.0.0-rc5-syzkaller-48543-g968c2729e576 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
=====================================================