=====================================================
BUG: KMSAN: uninit-value in __flush_smp_call_function_queue+0x343/0x1810 kernel/smp.c:549
 __flush_smp_call_function_queue+0x343/0x1810 kernel/smp.c:549
 generic_smp_call_function_single_interrupt+0x1c/0x30 kernel/smp.c:477
 __sysvec_call_function_single+0x48/0x350 arch/x86/kernel/smp.c:272
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:267 [inline]
 sysvec_call_function_single+0x7c/0x90 arch/x86/kernel/smp.c:267
 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:704
 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x33/0x60 kernel/locking/spinlock.c:198
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 pcpu_alloc_noprof+0x1da4/0x34c0 mm/percpu.c:1864
 snmp6_alloc_dev net/ipv6/addrconf.c:348 [inline]
 ipv6_add_dev+0xa83/0x1d50 net/ipv6/addrconf.c:413
 addrconf_notify+0x808/0x1cf0 net/ipv6/addrconf.c:3664
 notifier_call_chain kernel/notifier.c:85 [inline]
 raw_notifier_call_chain+0xe6/0x450 kernel/notifier.c:453
 call_netdevice_notifiers_info net/core/dev.c:2249 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2287 [inline]
 call_netdevice_notifiers+0x191/0x260 net/core/dev.c:2301
 register_netdevice+0x286c/0x2c50 net/core/dev.c:11461
 register_netdev+0xa3/0xe0 net/core/dev.c:11539
 sit_init_net+0x3be/0xc90 net/ipv6/sit.c:1861
 ops_init+0x2b6/0x9f0 net/core/net_namespace.c:137
 setup_net+0x127/0x6a0 net/core/net_namespace.c:446
 copy_net_ns+0x8a7/0xde0 net/core/net_namespace.c:579
 create_new_namespaces+0x726/0xe90 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0x1c9/0x330 kernel/nsproxy.c:234
 ksys_unshare+0x961/0x1400 kernel/fork.c:3242
 __do_sys_unshare kernel/fork.c:3316 [inline]
 __se_sys_unshare kernel/fork.c:3314 [inline]
 __x64_sys_unshare+0x47/0x70 kernel/fork.c:3314
 x64_sys_call+0x22b2/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable reuse.i created at:
 mas_wr_node_store lib/maple_tree.c:3129 [inline]
 mas_wr_store_entry+0xcf4/0x12a90 lib/maple_tree.c:3531
 mas_store_prealloc+0xb66/0x10c0 lib/maple_tree.c:4936

CPU: 0 UID: 0 PID: 11159 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================