=====================================================
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
 __msan_metadata_ptr_for_load_8+0x5/0x40 mm/kmsan/instrumentation.c:94
 do_iter_readv_writev+0x9e0/0xc10 fs/read_write.c:-1
 vfs_readv+0x34a/0xf30 fs/read_write.c:1020
 do_preadv fs/read_write.c:1134 [inline]
 __do_sys_preadv2 fs/read_write.c:1193 [inline]
 __se_sys_preadv2+0x22f/0x470 fs/read_write.c:1184
 __x64_sys_preadv2+0xe4/0x150 fs/read_write.c:1184
 x64_sys_call+0x3608/0x3ea0 arch/x86/include/generated/asm/syscalls_64.h:328
 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: 1 UID: 0 PID: 11527 Comm: syz.5.988 Tainted: G             L      syzkaller #0 PREEMPT(lazy) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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