=====================================================
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
 __preempt_count_dec_and_test arch/x86/include/asm/preempt.h:95 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x33/0x60 kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
 class_spinlock_irqsave_destructor include/linux/spinlock.h:618 [inline]
 snd_rawmidi_proceed+0x77b/0x820 sound/core/rawmidi.c:1515
 snd_vmidi_output_work+0x12e/0x4a0 sound/core/seq/seq_virmidi.c:146
 process_one_work kernel/workqueue.c:3275 [inline]
 process_scheduled_works+0xb21/0x1e30 kernel/workqueue.c:3358
 worker_thread+0xede/0x1580 kernel/workqueue.c:3439
 kthread+0x53f/0x600 kernel/kthread.c:467
 ret_from_fork+0x20f/0x910 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Local variable iter created at:
 tdp_mmu_zap_leafs+0x52/0x6e0 arch/x86/kvm/mmu/tdp_mmu.c:983
 kvm_tdp_mmu_unmap_gfn_range+0x910/0xb50 arch/x86/kvm/mmu/tdp_mmu.c:1362

CPU: 0 UID: 0 PID: 5991 Comm: kworker/0:2H Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_highpri snd_vmidi_output_work
=====================================================