=====================================================
BUG: KMSAN: uninit-value in irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:464
 irqentry_exit_to_kernel_mode_preempt+0xb0/0xc0 include/linux/irq-entry-common.h:464
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x82/0xa00 kernel/entry/common.c:164
 sysvec_apic_timer_interrupt+0x52/0x90 arch/x86/kernel/apic/apic.c:1061
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:697
 smap_save mm/kmsan/instrumentation.c:92 [inline]
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:35 [inline]
 __msan_metadata_ptr_for_store_2+0x14/0x40 mm/kmsan/instrumentation.c:92
 char2uni+0x13e/0x1d0 fs/nls/nls_utf8.c:-1
 asc2unichar fs/hfsplus/unicode.c:367 [inline]
 hfsplus_asc2uni+0x25f/0x1040 fs/hfsplus/unicode.c:458
 hfsplus_cat_build_key fs/hfsplus/catalog.c:49 [inline]
 hfsplus_create_cat+0x810/0x19c0 fs/hfsplus/catalog.c:296
 hfsplus_mknod+0x1fb/0x5f0 fs/hfsplus/dir.c:538
 hfsplus_mkdir+0x5a/0x80 fs/hfsplus/dir.c:579
 vfs_mkdir+0x653/0x9f0 fs/namei.c:5261
 filename_mkdirat+0x42f/0xa60 fs/namei.c:5294
 __do_sys_mkdirat fs/namei.c:5315 [inline]
 __se_sys_mkdirat+0x82/0x330 fs/namei.c:5312
 __ia32_sys_mkdirat+0x96/0xe0 fs/namei.c:5312
 ia32_sys_call+0x31b7/0x4360 arch/x86/include/generated/asm/syscalls_32.h:297
 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 u created at:
 char2uni+0x43/0x1d0 fs/nls/nls_utf8.c:32
 asc2unichar fs/hfsplus/unicode.c:367 [inline]
 hfsplus_asc2uni+0x25f/0x1040 fs/hfsplus/unicode.c:458

CPU: 1 UID: 0 PID: 10991 Comm: syz.4.1912 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
=====================================================