From: syzbot <syzbot+bc0e18379a290e5edfe4@syzkaller.appspotmail.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
pbonzini@redhat.com, syzkaller-bugs@googlegroups.com
Subject: [syzbot] [kvm?] WARNING in kvm_read_guest_offset_cached
Date: Tue, 15 Jul 2025 22:05:33 -0700 [thread overview]
Message-ID: <6877331d.a00a0220.3af5df.000c.GAE@google.com> (raw)
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:
<TASK>
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
</TASK>
---
This report is generated by a bot. It may contain errors.
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next reply other threads:[~2025-07-16 5:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-16 5:05 syzbot [this message]
2025-07-16 15:23 ` [syzbot] [kvm?] WARNING in kvm_read_guest_offset_cached Sean Christopherson
2026-02-10 9:21 ` Alexander Potapenko
2026-02-26 1:47 ` Sean Christopherson
2026-04-03 3:11 ` [PATCH] KVM: x86: Don't leave APF half-enabled on bad APF data GPA Ethan Yang
2026-04-03 8:11 ` Xiaoyao Li
2026-04-03 10:01 ` [PATCH v2] " Ethan Yang
2026-04-06 16:18 ` Sean Christopherson
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