=====================================================
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
 smap_save arch/x86/include/asm/smap.h:85 [inline]
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:35 [inline]
 __msan_metadata_ptr_for_load_4+0x18/0x40 mm/kmsan/instrumentation.c:93
 stack_trace_consume_entry+0x170/0x220 kernel/stacktrace.c:94
 arch_stack_walk+0x18e/0x280 arch/x86/kernel/stacktrace.c:27
 stack_trace_save+0xc2/0x100 kernel/stacktrace.c:122
 kmsan_save_stack_with_flags+0x2f/0x60 mm/kmsan/core.c:73
 kmsan_alloc_page+0x169/0x210 mm/kmsan/shadow.c:195
 __alloc_frozen_pages_noprof+0x6f7/0x1020 mm/page_alloc.c:5273
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x56/0x1d0 mm/mempolicy.c:2509
 shmem_alloc_folio mm/shmem.c:1930 [inline]
 shmem_alloc_and_add_folio+0xc54/0x1bd0 mm/shmem.c:1972
 shmem_get_folio_gfp+0xad3/0x1fc0 mm/shmem.c:2567
 shmem_fault+0x1e4/0x6b0 mm/shmem.c:2768
 __do_fault+0x136/0x5c0 mm/memory.c:5364
 do_read_fault mm/memory.c:5799 [inline]
 do_fault mm/memory.c:5933 [inline]
 do_pte_missing+0x1871/0x7350 mm/memory.c:4477
 handle_pte_fault mm/memory.c:6317 [inline]
 __handle_mm_fault mm/memory.c:6455 [inline]
 handle_mm_fault+0x2d96/0x6fc0 mm/memory.c:6624
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x2eff/0x5f00 mm/gup.c:1428
 populate_vma_page_range mm/gup.c:1860 [inline]
 __mm_populate+0x626/0xab0 mm/gup.c:1963
 mm_populate include/linux/mm.h:3894 [inline]
 vm_mmap_pgoff+0x577/0x760 mm/util.c:586
 ksys_mmap_pgoff+0x16b/0x7d0 mm/mmap.c:605
 __do_sys_mmap_pgoff mm/mmap.c:616 [inline]
 __se_sys_mmap_pgoff mm/mmap.c:612 [inline]
 __ia32_sys_mmap_pgoff+0x11a/0x1d0 mm/mmap.c:612
 ia32_sys_call+0x3743/0x4360 arch/x86/include/generated/asm/syscalls_32.h:193
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x17f/0x3f0 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 reuse.i created at:
 mas_wr_node_store lib/maple_tree.c:3495 [inline]
 mas_wr_store_entry+0x14bd/0x96d0 lib/maple_tree.c:3764
 mas_store_prealloc+0x1834/0x1e60 lib/maple_tree.c:5169

CPU: 0 UID: 0 PID: 9463 Comm: syz.6.1034 Tainted: G        W    L      syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN, [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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