=====================================================
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
 native_irq_enable arch/x86/include/asm/irqflags.h:42 [inline]
 arch_local_irq_enable arch/x86/include/asm/irqflags.h:119 [inline]
 raw_spin_rq_unlock_irq kernel/sched/sched.h:1644 [inline]
 finish_lock_switch kernel/sched/core.c:5125 [inline]
 finish_task_switch+0x37e/0xbc0 kernel/sched/core.c:5243
 context_switch kernel/sched/core.c:5391 [inline]
 __schedule+0x2930/0x8750 kernel/sched/core.c:7189
 __schedule_loop kernel/sched/core.c:7268 [inline]
 schedule+0x17c/0x3c0 kernel/sched/core.c:7283
 do_nanosleep+0x12c/0x7d0 kernel/time/hrtimer.c:2293
 hrtimer_nanosleep+0x228/0x480 kernel/time/hrtimer.c:2339
 common_nsleep+0x118/0x160 kernel/time/posix-timers.c:1345
 __do_sys_clock_nanosleep_time32 kernel/time/posix-timers.c:1419 [inline]
 __se_sys_clock_nanosleep_time32 kernel/time/posix-timers.c:1396 [inline]
 __ia32_sys_clock_nanosleep_time32+0x652/0x760 kernel/time/posix-timers.c:1396
 ia32_sys_call+0x3617/0x4360 arch/x86/include/generated/asm/syscalls_32.h:268
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 do_int80_emulation+0x177/0x380 arch/x86/entry/syscall_32.c:172
 asm_int80_emulation+0x1f/0x30 arch/x86/include/asm/idtentry.h:621

Uninit was stored to memory at:
 mas_topiary_replace lib/maple_tree.c:1893 [inline]
 mas_wmb_replace+0x3977/0x4690 lib/maple_tree.c:2083
 mas_wr_store_entry+0x9401/0x12a90 lib/maple_tree.c:-1
 mas_store_prealloc+0xb66/0x10c0 lib/maple_tree.c:4936
 vma_iter_store_overwrite mm/vma.h:616 [inline]
 vma_iter_store_new mm/vma.h:623 [inline]
 __mmap_new_vma mm/vma.c:2583 [inline]
 __mmap_region mm/vma.c:2771 [inline]
 mmap_region+0x4235/0x5f20 mm/vma.c:2857
 do_mmap+0x17aa/0x1d70 mm/mmap.c:560
 vm_mmap_pgoff+0x40c/0x760 mm/util.c:581
 vm_mmap+0xdb/0x120 mm/util.c:617
 __x86_set_memory_region+0x52c/0x830 arch/x86/kvm/x86.c:13458
 kvm_alloc_apic_access_page+0xc4/0x180 arch/x86/kvm/lapic.c:2866
 vmx_vcpu_create+0x5ef/0x1470 arch/x86/kvm/vmx/vmx.c:7740
 kvm_arch_vcpu_create+0x9d1/0xc60 arch/x86/kvm/x86.c:12905
 kvm_vm_ioctl_create_vcpu+0x525/0xdf0 virt/kvm/kvm_main.c:4201
 kvm_vm_ioctl+0xaa4/0x1680 virt/kvm/kvm_main.c:5159
 kvm_vm_compat_ioctl+0x347/0x630 virt/kvm/kvm_main.c:5461
 __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+0x195/0x470 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 tmp_next.i created at:
 mas_topiary_replace lib/maple_tree.c:1817 [inline]
 mas_wmb_replace+0xf1/0x4690 lib/maple_tree.c:2083
 mas_wr_store_entry+0x9401/0x12a90 lib/maple_tree.c:-1

CPU: 0 UID: 0 PID: 5590 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
=====================================================