=====================================================
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
 next_uptodate_folio+0x561/0x17b0 mm/filemap.c:3713
 filemap_map_pages+0x222/0x3f10 mm/filemap.c:3896
 do_fault_around mm/memory.c:5867 [inline]
 do_read_fault mm/memory.c:5900 [inline]
 do_fault mm/memory.c:6043 [inline]
 do_pte_missing+0x1cfa/0x7350 mm/memory.c:4566
 handle_pte_fault mm/memory.c:6427 [inline]
 __handle_mm_fault mm/memory.c:6565 [inline]
 handle_mm_fault+0x2da3/0x6ee0 mm/memory.c:6734
 faultin_page mm/gup.c:1126 [inline]
 __get_user_pages+0x3403/0x6260 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:4137 [inline]
 vm_mmap_pgoff+0x577/0x760 mm/util.c:586
 ksys_mmap_pgoff+0x16a/0x7e0 mm/mmap.c:606
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x19c/0x260 arch/x86/kernel/sys_x86_64.c:82
 x64_sys_call+0x18cd/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:10
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15d/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable rf created at:
 __schedule+0x3a/0x8750 kernel/sched/core.c:7028
 preempt_schedule_irq+0x50/0xa0 kernel/sched/core.c:7513

CPU: 0 UID: 0 PID: 12798 Comm: syz.8.1084 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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