Message-ID: <000000000000c2a6b9061cbca3c3@google.com>
Date: Mon, 08 Jul 2024 06:46:27 -0700
From: syzbot <syzbot+545f1326f405db4e1c3e@...kaller.appspotmail.com>
To: bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com, 
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, mingo@...hat.com, 
	mlevitsk@...hat.com, pbonzini@...hat.com, seanjc@...gle.com, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: [syzbot] [kvm?] WARNING in kvm_recalculate_apic_map

Hello,

syzbot found the following issue on:

HEAD commit:    f3a2439f20d9 Merge tag 'rproc-v6.3' of git://git.kernel.or..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12e2d518c80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=81f5afa0c201c8de
dashboard link: https://syzkaller.appspot.com/bug?extid=545f1326f405db4e1c3e
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16b7be60c80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11a380a8c80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/0719d575f3ac/disk-f3a2439f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/4176aabb67b5/vmlinux-f3a2439f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/2b0e3c0ab205/bzImage-f3a2439f.xz

The issue was bisected to:

commit 76e527509d37a15ff1714ddd003384f5f25fd3fc
Author: Sean Christopherson <seanjc@...gle.com>
Date:   Fri Jan 6 01:12:52 2023 +0000

    KVM: x86: Skip redundant x2APIC logical mode optimized cluster setup

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=124fbe60c80000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=114fbe60c80000
console output: https://syzkaller.appspot.com/x/log.txt?x=164fbe60c80000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+545f1326f405db4e1c3e@...kaller.appspotmail.com
Fixes: 76e527509d37 ("KVM: x86: Skip redundant x2APIC logical mode optimized cluster setup")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5078 at arch/x86/kvm/lapic.c:330 kvm_recalculate_logical_map arch/x86/kvm/lapic.c:330 [inline]
WARNING: CPU: 0 PID: 5078 at arch/x86/kvm/lapic.c:330 kvm_recalculate_apic_map+0x1267/0x14e0 arch/x86/kvm/lapic.c:413
Modules linked in:
CPU: 0 PID: 5078 Comm: syz-executor294 Not tainted 6.2.0-syzkaller-12485-gf3a2439f20d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
RIP: 0010:kvm_recalculate_logical_map arch/x86/kvm/lapic.c:330 [inline]
RIP: 0010:kvm_recalculate_apic_map+0x1267/0x14e0 arch/x86/kvm/lapic.c:413
Code: 8f ae a2 00 48 8b 3c 24 ba 01 00 00 00 be 04 00 00 00 e8 ac 83 fb ff 48 c7 44 24 08 00 00 00 00 e9 9b f7 ff ff e8 49 f9 6c 00 <0f> 0b e9 d2 f6 ff ff e8 3d f9 6c 00 4c 89 23 e9 c5 f6 ff ff 48 8b
RSP: 0018:ffffc900034af800 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff8880776f41c0 RSI: ffffffff811729b7 RDI: 0000000000000004
RBP: 0000000000000400 R08: 0000000000000004 R09: 0000000000000001
R10: 0000000000082000 R11: 0000000000000000 R12: ffff8880299f2000
R13: ffff88807d13c040 R14: dffffc0000000000 R15: 0000000000082000
FS:  0000555556467300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002004d008 CR3: 00000000760bd000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_apic_set_state+0x468/0xeb0 arch/x86/kvm/lapic.c:2951
 kvm_vcpu_ioctl_set_lapic arch/x86/kvm/x86.c:4858 [inline]
 kvm_arch_vcpu_ioctl+0x2862/0x3f90 arch/x86/kvm/x86.c:5593
 kvm_vcpu_ioctl+0x9ad/0xfe0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4255
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f5e46a52109
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcdc080378 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5e46a52109
RDX: 0000000020000880 RSI: 000000004400ae8f RDI: 0000000000000005
RBP: 00007f5e46a15b60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5e46a15bf0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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For information about bisection process see: https://goo.gl/tpsmEJ#bisection

If the report is already addressed, let syzbot know by replying with:
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