=====================================================
BUG: KMSAN: uninit-value in ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:56 [inline]
BUG: KMSAN: uninit-value in ip6table_mangle_hook+0x97d/0x9c0 net/ipv6/netfilter/ip6table_mangle.c:72
 ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:56 [inline]
 ip6table_mangle_hook+0x97d/0x9c0 net/ipv6/netfilter/ip6table_mangle.c:72
 nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline]
 nf_hook_slow+0xf4/0x400 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:269 [inline]
 __ip6_local_out+0x5ac/0x640 net/ipv6/output_core.c:143
 ip6_local_out+0x4c/0x210 net/ipv6/output_core.c:153
 ip6tunnel_xmit+0x129/0x460 include/net/ip6_tunnel.h:161
 ip6_tnl_xmit+0x345d/0x3900 net/ipv6/ip6_tunnel.c:1281
 __gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
 ip6gre_xmit_ipv6 net/ipv6/ip6_gre.c:873 [inline]
 ip6gre_tunnel_xmit+0xf5e/0x2030 net/ipv6/ip6_gre.c:925
 __netdev_start_xmit include/linux/netdevice.h:5144 [inline]
 netdev_start_xmit include/linux/netdevice.h:5153 [inline]
 xmit_one net/core/dev.c:3735 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3974 [inline]
 __dev_queue_xmit+0x30b9/0x57d0 net/core/dev.c:4550
 dev_queue_xmit include/linux/netdevice.h:3305 [inline]
 packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3132 [inline]
 packet_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:728
 __sys_sendto+0x594/0x750 net/socket.c:2182
 __do_sys_sendto net/socket.c:2189 [inline]
 __se_sys_sendto net/socket.c:2185 [inline]
 __x64_sys_sendto+0x125/0x1d0 net/socket.c:2185
 x64_sys_call+0x346a/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was stored to memory at:
 ip6_tnl_xmit+0x3584/0x3900 net/ipv6/ip6_tunnel.c:1277
 __gre6_xmit+0x14b9/0x1550 net/ipv6/ip6_gre.c:815
 ip6gre_xmit_ipv6 net/ipv6/ip6_gre.c:873 [inline]
 ip6gre_tunnel_xmit+0xf5e/0x2030 net/ipv6/ip6_gre.c:925
 __netdev_start_xmit include/linux/netdevice.h:5144 [inline]
 netdev_start_xmit include/linux/netdevice.h:5153 [inline]
 xmit_one net/core/dev.c:3735 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3974 [inline]
 __dev_queue_xmit+0x30b9/0x57d0 net/core/dev.c:4550
 dev_queue_xmit include/linux/netdevice.h:3305 [inline]
 packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3132 [inline]
 packet_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:728
 __sys_sendto+0x594/0x750 net/socket.c:2182
 __do_sys_sendto net/socket.c:2189 [inline]
 __se_sys_sendto net/socket.c:2185 [inline]
 __x64_sys_sendto+0x125/0x1d0 net/socket.c:2185
 x64_sys_call+0x346a/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:4121 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_node_noprof+0x907/0xe00 mm/slub.c:4216
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
 pskb_expand_head+0x226/0x1a60 net/core/skbuff.c:2275
 __skb_cow include/linux/skbuff.h:3769 [inline]
 skb_cow_head include/linux/skbuff.h:3803 [inline]
 __gre6_xmit+0x7ab/0x1550 net/ipv6/ip6_gre.c:803
 ip6gre_xmit_ipv6 net/ipv6/ip6_gre.c:873 [inline]
 ip6gre_tunnel_xmit+0xf5e/0x2030 net/ipv6/ip6_gre.c:925
 __netdev_start_xmit include/linux/netdevice.h:5144 [inline]
 netdev_start_xmit include/linux/netdevice.h:5153 [inline]
 xmit_one net/core/dev.c:3735 [inline]
 dev_hard_start_xmit+0x247/0xa20 net/core/dev.c:3751
 sch_direct_xmit+0x399/0xd40 net/sched/sch_generic.c:343
 __dev_xmit_skb net/core/dev.c:3974 [inline]
 __dev_queue_xmit+0x30b9/0x57d0 net/core/dev.c:4550
 dev_queue_xmit include/linux/netdevice.h:3305 [inline]
 packet_xmit+0x9c/0x6c0 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3132 [inline]
 packet_sendmsg+0x93e0/0xa7e0 net/packet/af_packet.c:3164
 sock_sendmsg_nosec net/socket.c:713 [inline]
 __sock_sendmsg+0x30f/0x380 net/socket.c:728
 __sys_sendto+0x594/0x750 net/socket.c:2182
 __do_sys_sendto net/socket.c:2189 [inline]
 __se_sys_sendto net/socket.c:2185 [inline]
 __x64_sys_sendto+0x125/0x1d0 net/socket.c:2185
 x64_sys_call+0x346a/0x3c30 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 0 UID: 0 PID: 8947 Comm: syz.2.752 Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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