syzbot


WARNING in kvm_read_guest_offset_cached

Status: premoderation: reported C repro on 2025/07/16 05:33
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+5d2bd424139cb58c8e3d@syzkaller.appspotmail.com
First crash: 11d, last: 11d
Bug presence (2)
Date Name Commit Repro Result
2025/07/16 lts (merge base) e0e2f7824338 C Didn't crash
2025/07/16 upstream (ToT) 155a3c003e55 C [report] WARNING in kvm_read_guest_offset_cached
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in kvm_read_guest_offset_cached kvm -1 C 4 9d21h 11d 0/29 upstream: reported C repro on 2025/07/16 05:05

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 297 at arch/x86/kvm/../../../virt/kvm/kvm_main.c:3574 kvm_read_guest_offset_cached+0x26d/0x2a0 virt/kvm/kvm_main.c:3574
Modules linked in:
CPU: 1 UID: 0 PID: 297 Comm: syz-executor376 Not tainted 6.12.30-syzkaller-g603af016e4a8 #0 c515e79d845c5a778cd5838f9063bc4edcb1333e
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:kvm_read_guest_offset_cached+0x26d/0x2a0 virt/kvm/kvm_main.c:3574
Code: bb f2 ff ff ff 0f 44 d8 31 ff e8 9e ab 71 00 89 d8 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 49 06 74 04 cc e8 a3 a6 71 00 <0f> 0b b8 ea ff ff ff eb de 4c 8b 75 c0 4c 03 75 d0 e8 8d a6 71 00
RSP: 0018:ffffc9000121f3a0 EFLAGS: 00010293
RAX: ffffffff8114045d RBX: 0000000000000004 RCX: ffff88810378b900
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008
RBP: ffffc9000121f3f0 R08: 0000000000000004 R09: 1ffff11023fae007
R10: dffffc0000000000 R11: ffffed1023fae008 R12: ffff88811fd71128
R13: 0000000000000000 R14: ffffc90000d194a8 R15: 0000000000000008
FS:  000055556fb55380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000129096000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 apf_pageready_slot_free arch/x86/kvm/x86.c:13376 [inline]
 kvm_arch_can_dequeue_async_page_present+0x142/0x300 arch/x86/kvm/x86.c:13495
 kvm_check_async_pf_completion+0xf9/0x3d0 virt/kvm/async_pf.c:158
 vcpu_enter_guest arch/x86/kvm/x86.c:10853 [inline]
 vcpu_run+0x2eab/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: 0033:0x7f9ae4eb81f9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff7d2c7378 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f9ae4eb81f9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f9ae4f2b610 R08: 00007fff7d2c7548 R09: 00007fff7d2c7548
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff7d2c7538 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/16 05:32 android16-6.12 603af016e4a8 03fcfc4b .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in kvm_read_guest_offset_cached
* Struck through repros no longer work on HEAD.