=====================================================
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
 hsr_create_tagged_frame+0x6f8/0x12f0
 hsr_forward_skb+0x22aa/0x3820 net/hsr/hsr_forward.c:620
 send_hsr_supervision_frame+0x920/0xe20 net/hsr/hsr_device.c:326
 hsr_announce+0x100/0x2a0 net/hsr/hsr_device.c:382
 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
 do_softirq+0x171/0x220 kernel/softirq.c:472
 __local_bh_enable_ip+0xd9/0xe0 kernel/softirq.c:396
 __raw_write_unlock_bh include/linux/rwlock_api_smp.h:281 [inline]
 _raw_write_unlock_bh+0x4f/0x60 kernel/locking/spinlock.c:366
 pneigh_ifdown_and_unlock net/core/neighbour.c:888 [inline]
 __neigh_ifdown+0x468/0x8b0 net/core/neighbour.c:439
 neigh_ifdown+0x67/0x90 net/core/neighbour.c:456
 rt6_disable_ip+0x1293/0x12c0 net/ipv6/route.c:4901
 addrconf_ifdown+0x203/0x3020 net/ipv6/addrconf.c:3755
 addrconf_notify+0x22c/0x1e50
 notifier_call_chain kernel/notifier.c:87 [inline]
 raw_notifier_call_chain+0x11b/0x2a0 kernel/notifier.c:455
 call_netdevice_notifiers_info net/core/dev.c:1944 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
 call_netdevice_notifiers net/core/dev.c:1996 [inline]
 unregister_netdevice_many_notify+0x19e1/0x3500 net/core/dev.c:10839
 unregister_netdevice_many+0x4e/0x60 net/core/dev.c:10895
 ip_tunnel_delete_nets+0x64c/0x680 net/ipv4/ip_tunnel.c:1126
 ipip_exit_batch_net+0x6f/0x80 net/ipv4/ipip.c:596
 ops_exit_list net/core/net_namespace.c:174 [inline]
 cleanup_net+0xd77/0x1860 net/core/net_namespace.c:606
 process_one_work+0xe73/0x18d0 kernel/workqueue.c:2289
 worker_thread+0x10fc/0x2230 kernel/workqueue.c:2436
 kthread+0x3c7/0x500 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

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
 hsr_create_tagged_frame+0x6f8/0x12f0
 hsr_forward_skb+0x22aa/0x3820 net/hsr/hsr_forward.c:620
 send_hsr_supervision_frame+0x920/0xe20 net/hsr/hsr_device.c:326
 hsr_announce+0x100/0x2a0 net/hsr/hsr_device.c:382
 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: 9 Comm: kworker/u4:0 Not tainted 6.2.0-rc8-syzkaller-80999-g31b504f219a9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Workqueue: netns cleanup_net
=====================================================