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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_get_metadata+0x0/0x160 mm/kmsan/shadow.c:91
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:38 [inline]
 __msan_metadata_ptr_for_load_8+0x24/0x40 mm/kmsan/instrumentation.c:94
 filter_irq_stacks+0x49/0x190 kernel/stacktrace.c:397
 stack_depot_save_flags+0x35/0x790 lib/stackdepot.c:667
 stack_depot_save+0x12/0x20 lib/stackdepot.c:747
 __msan_poison_alloca+0x100/0x1a0 mm/kmsan/instrumentation.c:286
 ptep_get include/linux/pgtable.h:461 [inline]
 filemap_map_order0_folio mm/filemap.c:3855 [inline]
 filemap_map_pages+0xeb7/0x3f10 mm/filemap.c:3931
 do_fault_around mm/memory.c:5757 [inline]
 do_read_fault mm/memory.c:5790 [inline]
 do_fault mm/memory.c:5933 [inline]
 do_pte_missing+0x2171/0x7350 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
 do_user_addr_fault+0x1760/0x2510 arch/x86/mm/fault.c:1334
 handle_page_fault arch/x86/mm/fault.c:1474 [inline]
 exc_page_fault+0x70/0xb0 arch/x86/mm/fault.c:1527
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618

Local variable mmap_event created at:
 perf_event_mmap+0x47/0x2fe0 kernel/events/core.c:9891
 __mmap_complete mm/vma.c:2585 [inline]
 __mmap_region mm/vma.c:2768 [inline]
 mmap_region+0x5030/0x62b0 mm/vma.c:2844

CPU: 1 UID: 0 PID: 8889 Comm: syz.2.742 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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