=====================================================
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
 __msan_metadata_ptr_for_store_8+0x33/0x40 mm/kmsan/instrumentation.c:94
 memset64+0xee/0x180 lib/string.c:605
 mmu_memory_cache_alloc_obj virt/kvm/kvm_main.c:360 [inline]
 __kvm_mmu_topup_memory_cache+0x505/0x9f0 virt/kvm/kvm_main.c:395
 kvm_mmu_topup_memory_cache+0x39/0x50 virt/kvm/kvm_main.c:405
 mmu_topup_memory_caches+0x1a6/0x2d0 arch/x86/kvm/mmu/mmu.c:611
 kvm_mmu_load+0xc8/0x4410 arch/x86/kvm/mmu/mmu.c:6075
 kvm_mmu_reload arch/x86/kvm/mmu.h:123 [inline]
 vcpu_enter_guest arch/x86/kvm/x86.c:11365 [inline]
 vcpu_run+0x60d5/0xa720 arch/x86/kvm/x86.c:11765
 kvm_arch_vcpu_ioctl_run+0x2394/0x2e50 arch/x86/kvm/x86.c:12120
 kvm_vcpu_ioctl+0xf87/0x1de0 virt/kvm/kvm_main.c:4469
 kvm_vcpu_compat_ioctl+0x27e/0x4a0 virt/kvm/kvm_main.c:4690
 __do_compat_sys_ioctl fs/ioctl.c:695 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:638 [inline]
 __ia32_compat_sys_ioctl+0x7f9/0x1270 fs/ioctl.c:638
 ia32_sys_call+0x2854/0x4360 arch/x86/include/generated/asm/syscalls_32.h:55
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x180/0x460 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x37/0x80 arch/x86/entry/syscall_32.c:332
 do_SYSENTER_32+0x1f/0x30 arch/x86/entry/syscall_32.c:370
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e

Local variable iter created at:
 tdp_mmu_zap_leafs+0x52/0x6e0 arch/x86/kvm/mmu/tdp_mmu.c:983
 kvm_tdp_mmu_unmap_gfn_range+0x910/0xb50 arch/x86/kvm/mmu/tdp_mmu.c:1362

CPU: 0 UID: 0 PID: 14036 Comm: syz.9.1976 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
=====================================================