linux-kernel - [syzbot] [kvmarm?] [kvm?] WARNING: locking bug in vgic_put

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Message-ID: <68acd0d9.a00a0220.33401d.048b.GAE@google.com>
Date: Mon, 25 Aug 2025 14:08:41 -0700
From: syzbot <syzbot+cef594105ac7e60c6d93@...kaller.appspotmail.com>
To: catalin.marinas@....com, joey.gouly@....com, kvm@...r.kernel.org, 
	kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, maz@...nel.org, oliver.upton@...ux.dev, 
	suzuki.poulose@....com, syzkaller-bugs@...glegroups.com, will@...nel.org, 
	yuzenghui@...wei.com
Subject: [syzbot] [kvmarm?] [kvm?] WARNING: locking bug in vgic_put_irq

Hello,

syzbot found the following issue on:

HEAD commit:    7b8346bd9fce KVM: arm64: Don't attempt vLPI mappings when ..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next
console output: https://syzkaller.appspot.com/x/log.txt?x=17b4e862580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7c53d3478750eda0
dashboard link: https://syzkaller.appspot.com/bug?extid=cef594105ac7e60c6d93
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15860634580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1074e862580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/fa3fbcfdac58/non_bootable_disk-7b8346bd.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/74f545807499/vmlinux-7b8346bd.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d83062566dc7/Image-7b8346bd.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cef594105ac7e60c6d93@...kaller.appspotmail.com

=============================
[ BUG: Invalid wait context ]
6.16.0-rc3-syzkaller-g7b8346bd9fce #0 Not tainted
-----------------------------
syz.0.29/3743 is trying to lock:
a3ff80008e2e9e18 (&xa->xa_lock#20){....}-{3:3}, at: vgic_put_irq+0xb4/0x190 arch/arm64/kvm/vgic/vgic.c:137
other info that might help us debug this:
context-{5:5}
3 locks held by syz.0.29/3743:
 #0: a3ff80008e2e90a8 (&kvm->slots_lock){+.+.}-{4:4}, at: kvm_vgic_destroy+0x50/0x624 arch/arm64/kvm/vgic/vgic-init.c:499
 #1: a3ff80008e2e9fa0 (&kvm->arch.config_lock){+.+.}-{4:4}, at: kvm_vgic_destroy+0x5c/0x624 arch/arm64/kvm/vgic/vgic-init.c:500
 #2: 58f0000021be1428 (&vgic_cpu->ap_list_lock){....}-{2:2}, at: vgic_flush_pending_lpis+0x3c/0x31c arch/arm64/kvm/vgic/vgic.c:150
stack backtrace:
CPU: 0 UID: 0 PID: 3743 Comm: syz.0.29 Not tainted 6.16.0-rc3-syzkaller-g7b8346bd9fce #0 PREEMPT 
Hardware name: linux,dummy-virt (DT)
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 dump_stack+0x1c/0x28 lib/dump_stack.c:129
 print_lock_invalid_wait_context kernel/locking/lockdep.c:4833 [inline]
 check_wait_context kernel/locking/lockdep.c:4905 [inline]
 __lock_acquire+0x978/0x299c kernel/locking/lockdep.c:5190
 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5871
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162
 vgic_put_irq+0xb4/0x190 arch/arm64/kvm/vgic/vgic.c:137
 vgic_flush_pending_lpis+0x24c/0x31c arch/arm64/kvm/vgic/vgic.c:158
 __kvm_vgic_vcpu_destroy+0x44/0x500 arch/arm64/kvm/vgic/vgic-init.c:455
 kvm_vgic_destroy+0x100/0x624 arch/arm64/kvm/vgic/vgic-init.c:505
 kvm_arch_destroy_vm+0x80/0x138 arch/arm64/kvm/arm.c:244
 kvm_destroy_vm virt/kvm/kvm_main.c:1308 [inline]
 kvm_put_kvm+0x800/0xff8 virt/kvm/kvm_main.c:1344
 kvm_vm_release+0x58/0x78 virt/kvm/kvm_main.c:1367
 __fput+0x4ac/0x980 fs/file_table.c:465
 ____fput+0x20/0x58 fs/file_table.c:493
 task_work_run+0x1bc/0x254 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 do_notify_resume+0x1b4/0x270 arch/arm64/kernel/entry-common.c:151
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xb4/0x160 arch/arm64/kernel/entry-common.c:768
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600


---
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