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Tue, 15 Jul 2025 22:05:33 -0700 (PDT) Date: Tue, 15 Jul 2025 22:05:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6877331d.a00a0220.3af5df.000c.GAE@google.com> Subject: [syzbot] [kvm?] WARNING in kvm_read_guest_offset_cached From: syzbot To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, pbonzini@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 155a3c003e55 Merge tag 'for-6.16/dm-fixes-2' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=103e858c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8d5ef2da1e1c848 dashboard link: https://syzkaller.appspot.com/bug?extid=bc0e18379a290e5edfe4 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=153188f0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f6198c580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-155a3c00.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/725a320dfe66/vmlinux-155a3c00.xz kernel image: https://storage.googleapis.com/syzbot-assets/9f06899bb6f3/bzImage-155a3c00.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bc0e18379a290e5edfe4@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6107 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:3459 kvm_read_guest_offset_cached+0x3f5/0x4b0 virt/kvm/kvm_main.c:3459 Modules linked in: CPU: 0 UID: 0 PID: 6107 Comm: syz.0.16 Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:kvm_read_guest_offset_cached+0x3f5/0x4b0 virt/kvm/kvm_main.c:3459 Code: 0f 01 e8 3e 6c 61 00 e9 9b fc ff ff e8 14 25 85 00 48 8b 3c 24 31 d2 48 89 ee e8 16 bf fa 00 e9 2e fe ff ff e8 fc 24 85 00 90 <0f> 0b 90 bb ea ff ff ff e9 4d fe ff ff e8 e9 24 85 00 48 8b 74 24 RSP: 0018:ffffc9000349f960 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888050329898 RCX: ffffffff8136ca66 RDX: ffff88803cfa8000 RSI: ffffffff8136cd84 RDI: 0000000000000006 RBP: 0000000000000004 R08: 0000000000000006 R09: 0000000000000008 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004 R13: ffffc90003921000 R14: 0000000000000000 R15: ffffc900039215a0 FS: 000055558378f500(0000) GS:ffff8880d6713000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000025de6000 CR4: 0000000000352ef0 Call Trace: apf_pageready_slot_free arch/x86/kvm/x86.c:13452 [inline] kvm_arch_can_dequeue_async_page_present+0x172/0x310 arch/x86/kvm/x86.c:13571 kvm_check_async_pf_completion+0x61/0x440 virt/kvm/async_pf.c:158 vcpu_enter_guest arch/x86/kvm/x86.c:10930 [inline] vcpu_run+0x48c2/0x5500 arch/x86/kvm/x86.c:11335 kvm_arch_vcpu_ioctl_run+0x51e/0x18c0 arch/x86/kvm/x86.c:11658 kvm_vcpu_ioctl+0x5eb/0x1690 virt/kvm/kvm_main.c:4464 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb7658e929 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:00007ffd25fe7d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fdb767b5fa0 RCX: 00007fdb7658e929 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00007fdb76610b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdb767b5fa0 R14: 00007fdb767b5fa0 R15: 0000000000000003 --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. 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