=====================================================
BUG: KMSAN: uninit-value in native_apic_mem_write+0x72/0x90 arch/x86/include/asm/apic.h:105
 native_apic_mem_write+0x72/0x90 arch/x86/include/asm/apic.h:105
 apic_eoi arch/x86/include/asm/apic.h:398 [inline]
 ack_APIC_irq arch/x86/include/asm/apic.h:444 [inline]
 __sysvec_reschedule_ipi arch/x86/kernel/smp.c:227 [inline]
 sysvec_reschedule_ipi+0x35/0x120 arch/x86/kernel/smp.c:225
 asm_sysvec_reschedule_ipi+0x1f/0x30 arch/x86/include/asm/idtentry.h:654
 smap_restore arch/x86/include/asm/smap.h:56 [inline]
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:37 [inline]
 __msan_metadata_ptr_for_store_4+0x2e/0x40 mm/kmsan/instrumentation.c:91
 __skb_dst_copy include/net/dst.h:275 [inline]
 skb_dst_copy include/net/dst.h:283 [inline]
 __copy_skb_header+0x24d/0xac0 net/core/skbuff.c:1192
 __skb_clone+0xa2/0xa40 net/core/skbuff.c:1243
 skb_clone+0x4a9/0x670 net/core/skbuff.c:1721
 ipv6_raw_deliver net/ipv6/raw.c:194 [inline]
 raw6_local_deliver+0x1498/0x1950 net/ipv6/raw.c:209
 ip6_protocol_deliver_rcu+0x5c4/0x3290 net/ipv6/ip6_input.c:385
 ip6_input_finish net/ipv6/ip6_input.c:484 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip6_input+0x1d9/0x530 net/ipv6/ip6_input.c:493
 dst_input include/net/dst.h:454 [inline]
 ip6_rcv_finish+0x647/0x900 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ipv6_rcv+0x154/0x440 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5482 [inline]
 __netif_receive_skb+0x1f1/0x640 net/core/dev.c:5596
 process_backlog+0x50c/0xb80 net/core/dev.c:5924
 __napi_poll+0x144/0xbb0 net/core/dev.c:6485
 napi_poll net/core/dev.c:6552 [inline]
 net_rx_action+0xa41/0x1a90 net/core/dev.c:6663
 __do_softirq+0x211/0x818 kernel/softirq.c:571
 do_softirq+0x171/0x220 kernel/softirq.c:472
 __local_bh_enable_ip+0xd9/0xe0 kernel/softirq.c:396
 local_bh_enable+0x3a/0x40 include/linux/bottom_half.h:33
 rcu_read_unlock_bh include/linux/rcupdate.h:834 [inline]
 ip6_finish_output2+0x244e/0x2c60 net/ipv6/ip6_output.c:135
 __ip6_finish_output net/ipv6/ip6_output.c:195 [inline]
 ip6_finish_output+0xcd3/0x1630 net/ipv6/ip6_output.c:206
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip6_output+0x493/0x820 net/ipv6/ip6_output.c:227
 dst_output include/net/dst.h:444 [inline]
 ip6_local_out+0x184/0x1f0 net/ipv6/output_core.c:155
 ip6_send_skb net/ipv6/ip6_output.c:1984 [inline]
 ip6_push_pending_frames+0x275/0x580 net/ipv6/ip6_output.c:2004
 rawv6_push_pending_frames+0xf56/0xfe0 net/ipv6/raw.c:583
 rawv6_sendmsg+0x308d/0x33c0 net/ipv6/raw.c:926
 inet_sendmsg+0x15f/0x1d0 net/ipv4/af_inet.c:828
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 ____sys_sendmsg+0xe11/0x1250 net/socket.c:2476
 ___sys_sendmsg+0x4e6/0x580 net/socket.c:2530
 __sys_sendmmsg+0x75c/0xcf0 net/socket.c:2609
 __compat_sys_sendmmsg net/compat.c:359 [inline]
 __do_compat_sys_sendmmsg net/compat.c:366 [inline]
 __se_compat_sys_sendmmsg net/compat.c:363 [inline]
 __ia32_compat_sys_sendmmsg+0x12b/0x180 net/compat.c:363
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0xa2/0x100 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/common.c:203
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/common.c:246
 entry_SYSENTER_compat_after_hwframe+0x70/0x82

Uninit was created at:
 slab_post_alloc_hook+0x271/0xf70 mm/slab.h:766
 slab_alloc_node mm/slub.c:3452 [inline]
 slab_alloc mm/slub.c:3460 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3467 [inline]
 kmem_cache_alloc+0x586/0xb40 mm/slub.c:3476
 skb_clone+0x3ec/0x670 net/core/skbuff.c:1714
 ipv6_raw_deliver net/ipv6/raw.c:194 [inline]
 raw6_local_deliver+0x1498/0x1950 net/ipv6/raw.c:209
 ip6_protocol_deliver_rcu+0x5c4/0x3290 net/ipv6/ip6_input.c:385
 ip6_input_finish net/ipv6/ip6_input.c:484 [inline]
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ip6_input+0x1d9/0x530 net/ipv6/ip6_input.c:493
 dst_input include/net/dst.h:454 [inline]
 ip6_rcv_finish+0x647/0x900 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:302 [inline]
 ipv6_rcv+0x154/0x440 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5482 [inline]
 __netif_receive_skb+0x1f1/0x640 net/core/dev.c:5596
 process_backlog+0x50c/0xb80 net/core/dev.c:5924
 __napi_poll+0x144/0xbb0 net/core/dev.c:6485
 napi_poll net/core/dev.c:6552 [inline]
 net_rx_action+0xa41/0x1a90 net/core/dev.c:6663
 __do_softirq+0x211/0x818 kernel/softirq.c:571

CPU: 0 PID: 6086 Comm: syz-executor.3 Not tainted 6.2.0-rc8-syzkaller-80999-g31b504f219a9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
=====================================================