=====================================================
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_restore arch/x86/include/asm/smap.h:90 [inline]
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:39 [inline]
 __msan_metadata_ptr_for_load_8+0x2c/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
 insert_page_into_pte_locked+0x96a/0x10e0 mm/memory.c:-1
 insert_page+0x457/0x650 mm/memory.c:2396
 vm_insert_page+0x4b2/0x5c0 mm/memory.c:2547
 kcov_mmap+0xb8/0x130 kernel/kcov.c:514
 vfs_mmap include/linux/fs.h:2070 [inline]
 mmap_file mm/internal.h:167 [inline]
 __mmap_new_file_vma mm/vma.c:2468 [inline]
 __mmap_new_vma mm/vma.c:2532 [inline]
 __mmap_region mm/vma.c:2759 [inline]
 mmap_region+0x3a98/0x6220 mm/vma.c:2837
 do_mmap+0x17aa/0x1d70 mm/mmap.c:559
 vm_mmap_pgoff+0x40c/0x760 mm/util.c:581
 ksys_mmap_pgoff+0x524/0x7d0 mm/mmap.c:605
 __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+0x134/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Local variable tmp created at:
 number+0x83/0x2190 lib/vsprintf.c:470
 vsnprintf+0xd0d/0x1b00 lib/vsprintf.c:2912

CPU: 0 UID: 0 PID: 6261 Comm: syz.2.110 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
=====================================================