=====================================================
BUG: KMSAN: uninit-value in nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255
 nf_reject_ip6_tcphdr_put+0x688/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:255
 nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344
 nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161
 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]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip6_xmit+0x2488/0x25d0 net/ipv6/ip6_output.c:366
 tcp_v6_send_synack+0xa7c/0xeb0 net/ipv6/tcp_ipv6.c:565
 tcp_conn_request+0x3cb6/0x4b00 net/ipv4/tcp_input.c:7301
 tcp_v6_conn_request+0x2f5/0x3d0 net/ipv6/tcp_ipv6.c:1325
 tcp_rcv_state_process+0x2f1/0x4c10 net/ipv4/tcp_input.c:6723
 tcp_v6_do_rcv+0xc9b/0x1c30 net/ipv6/tcp_ipv6.c:1666
 tcp_v6_rcv+0x43f1/0x4fa0 net/ipv6/tcp_ipv6.c:1903
 ip6_protocol_deliver_rcu+0x1ad5/0x2cb0 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip6_input+0x161/0x430 net/ipv6/ip6_input.c:490
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x617/0x970 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5662 [inline]
 __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775
 netif_receive_skb_internal net/core/dev.c:5861 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5920
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1550
 tun_get_user+0x5783/0x6c60 drivers/net/tun.c:2007
 tun_chr_write_iter+0x3ac/0x5d0 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xb28/0x1540 fs/read_write.c:683
 ksys_write+0x20f/0x4c0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:748 [inline]
 __se_sys_write fs/read_write.c:745 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:745
 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2
 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:
 nf_reject_ip6_tcphdr_put+0x60c/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:249
 nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344
 nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161
 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]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip6_xmit+0x2488/0x25d0 net/ipv6/ip6_output.c:366
 tcp_v6_send_synack+0xa7c/0xeb0 net/ipv6/tcp_ipv6.c:565
 tcp_conn_request+0x3cb6/0x4b00 net/ipv4/tcp_input.c:7301
 tcp_v6_conn_request+0x2f5/0x3d0 net/ipv6/tcp_ipv6.c:1325
 tcp_rcv_state_process+0x2f1/0x4c10 net/ipv4/tcp_input.c:6723
 tcp_v6_do_rcv+0xc9b/0x1c30 net/ipv6/tcp_ipv6.c:1666
 tcp_v6_rcv+0x43f1/0x4fa0 net/ipv6/tcp_ipv6.c:1903
 ip6_protocol_deliver_rcu+0x1ad5/0x2cb0 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip6_input+0x161/0x430 net/ipv6/ip6_input.c:490
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x617/0x970 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5662 [inline]
 __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775
 netif_receive_skb_internal net/core/dev.c:5861 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5920
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1550
 tun_get_user+0x5783/0x6c60 drivers/net/tun.c:2007
 tun_chr_write_iter+0x3ac/0x5d0 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xb28/0x1540 fs/read_write.c:683
 ksys_write+0x20f/0x4c0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:748 [inline]
 __se_sys_write fs/read_write.c:745 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:745
 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2
 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:
 nf_reject_ip6_tcphdr_put+0x2ca/0x6c0 net/ipv6/netfilter/nf_reject_ipv6.c:231
 nf_send_reset6+0xd84/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:344
 nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161
 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]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip6_xmit+0x2488/0x25d0 net/ipv6/ip6_output.c:366
 tcp_v6_send_synack+0xa7c/0xeb0 net/ipv6/tcp_ipv6.c:565
 tcp_conn_request+0x3cb6/0x4b00 net/ipv4/tcp_input.c:7301
 tcp_v6_conn_request+0x2f5/0x3d0 net/ipv6/tcp_ipv6.c:1325
 tcp_rcv_state_process+0x2f1/0x4c10 net/ipv4/tcp_input.c:6723
 tcp_v6_do_rcv+0xc9b/0x1c30 net/ipv6/tcp_ipv6.c:1666
 tcp_v6_rcv+0x43f1/0x4fa0 net/ipv6/tcp_ipv6.c:1903
 ip6_protocol_deliver_rcu+0x1ad5/0x2cb0 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip6_input+0x161/0x430 net/ipv6/ip6_input.c:490
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x617/0x970 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5662 [inline]
 __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775
 netif_receive_skb_internal net/core/dev.c:5861 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5920
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1550
 tun_get_user+0x5783/0x6c60 drivers/net/tun.c:2007
 tun_chr_write_iter+0x3ac/0x5d0 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xb28/0x1540 fs/read_write.c:683
 ksys_write+0x20f/0x4c0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:748 [inline]
 __se_sys_write fs/read_write.c:745 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:745
 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2
 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:4092 [inline]
 slab_alloc_node mm/slub.c:4135 [inline]
 kmem_cache_alloc_node_noprof+0x6bf/0xb80 mm/slub.c:4187
 kmalloc_reserve+0x13d/0x4a0 net/core/skbuff.c:587
 __alloc_skb+0x363/0x7b0 net/core/skbuff.c:678
 alloc_skb include/linux/skbuff.h:1322 [inline]
 nf_send_reset6+0x98d/0x15b0 net/ipv6/netfilter/nf_reject_ipv6.c:327
 nft_reject_inet_eval+0x3c1/0x880 net/netfilter/nft_reject_inet.c:48
 expr_call_ops_eval net/netfilter/nf_tables_core.c:240 [inline]
 nft_do_chain+0x426/0x2290 net/netfilter/nf_tables_core.c:288
 nft_do_chain_inet+0x41a/0x4f0 net/netfilter/nft_chain_filter.c:161
 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]
 NF_HOOK include/linux/netfilter.h:312 [inline]
 ip6_xmit+0x2488/0x25d0 net/ipv6/ip6_output.c:366
 tcp_v6_send_synack+0xa7c/0xeb0 net/ipv6/tcp_ipv6.c:565
 tcp_conn_request+0x3cb6/0x4b00 net/ipv4/tcp_input.c:7301
 tcp_v6_conn_request+0x2f5/0x3d0 net/ipv6/tcp_ipv6.c:1325
 tcp_rcv_state_process+0x2f1/0x4c10 net/ipv4/tcp_input.c:6723
 tcp_v6_do_rcv+0xc9b/0x1c30 net/ipv6/tcp_ipv6.c:1666
 tcp_v6_rcv+0x43f1/0x4fa0 net/ipv6/tcp_ipv6.c:1903
 ip6_protocol_deliver_rcu+0x1ad5/0x2cb0 net/ipv6/ip6_input.c:436
 ip6_input_finish net/ipv6/ip6_input.c:481 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip6_input+0x161/0x430 net/ipv6/ip6_input.c:490
 dst_input include/net/dst.h:460 [inline]
 ip6_rcv_finish+0x617/0x970 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ipv6_rcv+0xde/0x390 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5662 [inline]
 __netif_receive_skb+0x1da/0xa00 net/core/dev.c:5775
 netif_receive_skb_internal net/core/dev.c:5861 [inline]
 netif_receive_skb+0x58/0x660 net/core/dev.c:5920
 tun_rx_batched+0x3ee/0x980 drivers/net/tun.c:1550
 tun_get_user+0x5783/0x6c60 drivers/net/tun.c:2007
 tun_chr_write_iter+0x3ac/0x5d0 drivers/net/tun.c:2053
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xb28/0x1540 fs/read_write.c:683
 ksys_write+0x20f/0x4c0 fs/read_write.c:736
 __do_sys_write fs/read_write.c:748 [inline]
 __se_sys_write fs/read_write.c:745 [inline]
 __x64_sys_write+0x93/0xe0 fs/read_write.c:745
 x64_sys_call+0x306a/0x3ba0 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 1 UID: 0 PID: 26821 Comm: syz.4.5547 Tainted: G        W          6.11.0-syzkaller-08829-gaf9c191ac2a0 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
=====================================================