------------[ cut here ]------------ WARNING: CPU: 1 PID: 891 at arch/x86/kvm/x86.c:8135 emulator_pio_in_out+0x38a/0x490 arch/x86/kvm/x86.c:8135 Modules linked in: CPU: 1 UID: 0 PID: 891 Comm: syz.4.178 Not tainted 6.12.30-syzkaller-g15178d63ac5e #0 2e49b5e8bba3abd4e44f2eeb6ccfddb4f386a3cf Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:emulator_pio_in_out+0x38a/0x490 arch/x86/kvm/x86.c:8135 Code: b6 04 38 84 c0 0f 85 ec 00 00 00 66 44 89 23 31 c0 48 83 c4 38 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 56 f7 67 00 <0f> 0b e9 e6 fc ff ff 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c ff fd ff RSP: 0018:ffffc9000430f290 EFLAGS: 00010293 RAX: ffffffff811db3ca RBX: ffffc9000430f360 RCX: ffff888120ff9300 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000430f2f0 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: ffffffff812f88f0 R12: 0000000000000021 R13: 0000000000000001 R14: 0000000000000001 R15: ffff8881047ecaf8 FS: 00007fc23426a6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000085200000c CR3: 000000011fb16000 CR4: 00000000003526b0 Call Trace: emulator_pio_in arch/x86/kvm/x86.c:8182 [inline] kvm_fast_pio_in arch/x86/kvm/x86.c:9368 [inline] kvm_fast_pio+0x198/0x5f0 arch/x86/kvm/x86.c:9385 handle_io+0xfe/0x150 arch/x86/kvm/vmx/vmx.c:5402 __vmx_handle_exit arch/x86/kvm/vmx/vmx.c:6609 [inline] vmx_handle_exit+0x12c2/0x1b40 arch/x86/kvm/vmx/vmx.c:6626 vcpu_enter_guest arch/x86/kvm/x86.c:11097 [inline] vcpu_run+0x481a/0x7260 arch/x86/kvm/x86.c:11258 kvm_arch_vcpu_ioctl_run+0x101a/0x1aa0 arch/x86/kvm/x86.c:11582 kvm_vcpu_ioctl+0x96f/0xee0 virt/kvm/kvm_main.c:4511 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0x135/0x1b0 fs/ioctl.c:893 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fc23338e9a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc23426a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc2335b6080 RCX: 00007fc23338e9a9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00007fc233410d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fc2335b6080 R15: 00007ffe95cbab68 ---[ end trace 0000000000000000 ]---