=====================================================
BUG: KMSAN: uninit-value in __flush_smp_call_function_queue+0x362/0x18e0 kernel/smp.c:535
 __flush_smp_call_function_queue+0x362/0x18e0 kernel/smp.c:535
 generic_smp_call_function_single_interrupt+0x1c/0x30 kernel/smp.c:463
 __sysvec_call_function_single+0x4b/0x3e0 arch/x86/kernel/smp.c:271
 instr_sysvec_call_function_single arch/x86/kernel/smp.c:266 [inline]
 sysvec_call_function_single+0x7c/0x90 arch/x86/kernel/smp.c:266
 asm_sysvec_call_function_single+0x1f/0x30 arch/x86/include/asm/idtentry.h:704
 kmsan_metadata_is_contiguous+0x2b/0x1e0 mm/kmsan/core.c:341
 kmsan_get_shadow_origin_ptr+0x27/0xb0 mm/kmsan/shadow.c:96
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:38 [inline]
 __msan_metadata_ptr_for_load_4+0x24/0x40 mm/kmsan/instrumentation.c:93
 slab_post_alloc_hook mm/slub.c:4502 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 kmem_cache_alloc_node_noprof+0x33d/0x12d0 mm/slub.c:4918
 alloc_vmap_area+0x327/0x2e30 mm/vmalloc.c:2065
 __get_vm_area_node+0x263/0x3b0 mm/vmalloc.c:3232
 __vmalloc_node_range_noprof+0x44a/0x2d80 mm/vmalloc.c:4024
 __vmalloc_node_noprof mm/vmalloc.c:4124 [inline]
 __vmalloc_noprof+0x128/0x1f0 mm/vmalloc.c:4140
 __vmalloc_array_noprof mm/util.c:633 [inline]
 __vcalloc_noprof+0x52/0x90 mm/util.c:656
 kvm_alloc_memslot_metadata arch/x86/kvm/x86.c:13489 [inline]
 kvm_arch_prepare_memory_region+0xcee/0x16a0 arch/x86/kvm/x86.c:13566
 kvm_prepare_memory_region virt/kvm/kvm_main.c:1694 [inline]
 kvm_set_memslot+0x56e/0x1950 virt/kvm/kvm_main.c:1939
 kvm_set_memory_region+0x145a/0x18a0 virt/kvm/kvm_main.c:2120
 kvm_vm_ioctl_set_memory_region+0xd3/0x150 virt/kvm/kvm_main.c:2154
 kvm_vm_ioctl+0xc21/0x1680 virt/kvm/kvm_main.c:5208
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0x23c/0x400 fs/ioctl.c:583
 __x64_sys_ioctl+0x97/0xe0 fs/ioctl.c:583
 x64_sys_call+0x1975/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable rf created at:
 __schedule+0x3b/0x8640 kernel/sched/core.c:6775
 preempt_schedule_irq+0x50/0xa0 kernel/sched/core.c:7238

CPU: 0 UID: 0 PID: 9857 Comm: syz.3.534 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
=====================================================