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@xxxxxxxxxx> 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@xxxxxxxxxxxxxxxxxxxxxxxxx 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
