=====================================================
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
 skb_dst_copy include/net/dst.h:283 [inline]
 __copy_skb_header+0x502/0xac0 net/core/skbuff.c:1192
 __skb_clone+0xa2/0xa40 net/core/skbuff.c:1243
 skb_clone+0x4a9/0x670 net/core/skbuff.c:1721
 ip_mc_output+0x4f9/0x1260 net/ipv4/ip_output.c:392
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x184/0x1f0 net/ipv4/ip_output.c:126
 igmp_send_report+0x1388/0x1490 net/ipv4/igmp.c:793
 igmp_timer_expire+0x7b7/0x1070
 call_timer_fn+0x8d/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x94f/0x11c0 kernel/time/timer.c:2022
 run_timer_softirq+0x75/0xf0 kernel/time/timer.c:2035
 __do_softirq+0x211/0x818 kernel/softirq.c:571
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x117/0x260 kernel/softirq.c:650
 irq_exit_rcu+0x12/0x20 kernel/softirq.c:662
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1107
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:649
 native_irq_enable arch/x86/include/asm/irqflags.h:45 [inline]
 arch_local_irq_enable arch/x86/include/asm/irqflags.h:80 [inline]
 raw_spin_rq_unlock_irq kernel/sched/sched.h:1370 [inline]
 finish_lock_switch kernel/sched/core.c:5053 [inline]
 finish_task_switch+0x22b/0xb50 kernel/sched/core.c:5171
 context_switch kernel/sched/core.c:5297 [inline]
 __schedule+0x2467/0x6b70 kernel/sched/core.c:6618
 preempt_schedule_common+0xfd/0x190 kernel/sched/core.c:6787
 __cond_resched+0x23/0x40 kernel/sched/core.c:8465
 _cond_resched include/linux/sched.h:2071 [inline]
 copy_pte_range mm/memory.c:1060 [inline]
 copy_pmd_range mm/memory.c:1120 [inline]
 copy_pud_range mm/memory.c:1157 [inline]
 copy_p4d_range mm/memory.c:1181 [inline]
 copy_page_range+0x92bd/0xadb0 mm/memory.c:1279
 dup_mmap kernel/fork.c:694 [inline]
 dup_mm kernel/fork.c:1548 [inline]
 copy_mm+0x1f56/0x3170 kernel/fork.c:1597
 copy_process+0x29fe/0x6970 kernel/fork.c:2266
 kernel_clone+0x4d6/0x1130 kernel/fork.c:2681
 __do_sys_clone kernel/fork.c:2822 [inline]
 __se_sys_clone kernel/fork.c:2806 [inline]
 __x64_sys_clone+0x2b0/0x430 kernel/fork.c:2806
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

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
 ip_mc_output+0x4f9/0x1260 net/ipv4/ip_output.c:392
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0x184/0x1f0 net/ipv4/ip_output.c:126
 igmp_send_report+0x1388/0x1490 net/ipv4/igmp.c:793
 igmp_timer_expire+0x7b7/0x1070
 call_timer_fn+0x8d/0x580 kernel/time/timer.c:1700
 expire_timers kernel/time/timer.c:1751 [inline]
 __run_timers+0x94f/0x11c0 kernel/time/timer.c:2022
 run_timer_softirq+0x75/0xf0 kernel/time/timer.c:2035
 __do_softirq+0x211/0x818 kernel/softirq.c:571

CPU: 1 PID: 5010 Comm: syz-executor.2 Tainted: G        W          6.2.0-rc8-syzkaller-80999-g31b504f219a9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
=====================================================