syzbot


WARNING in nested_vmx_vmexit

Status: premoderation: reported C repro on 2025/10/22 16:54
Bug presence: origin:lts
[Documentation on labels]
Reported-by: syzbot+7a39174c3456b1b1a948@syzkaller.appspotmail.com
First crash: 143d, last: 25d
Bug presence (2)
Date Name Commit Repro Result
2025/10/23 lts (merge base) b0c51e95f54e C [report] WARNING in nested_vmx_vmexit
2025/10/23 upstream (ToT) 43e9ad0c55a3 C Didn't crash
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in nested_vmx_vmexit kvm-x86 -1 C done 101 1543d 1560d 20/29 fixed on 2022/03/08 16:11
Last patch testing requests (3)
Created Duration User Patch Repo Result
2026/02/17 06:32 15m retest repro android16-6.12 report log
2026/01/15 06:05 4m retest repro android16-6.12 error
2025/11/05 23:14 9m retest repro android16-6.12 error

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 447 at arch/x86/kvm/vmx/nested.c:4933 nested_vmx_vmexit+0x18d1/0x27c0 arch/x86/kvm/vmx/nested.c:4933
Modules linked in:
CPU: 0 UID: 0 PID: 447 Comm: syz.2.38 Not tainted syzkaller #0 d2070f6ccd239e5a47ec9c1c2f682235c3170fcc
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:nested_vmx_vmexit+0x18d1/0x27c0 arch/x86/kvm/vmx/nested.c:4933
Code: 00 0f 85 47 03 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d e9 0f ea 6e 04 cc e8 f9 76 55 00 e9 43 f6 ff ff e8 ef 76 55 00 <0f> 0b e9 38 e8 ff ff b8 00 44 00 00 0f 78 c0 0f 86 74 0e 00 00 89
RSP: 0018:ffffc90000f6f3c0 EFLAGS: 00010293
RAX: ffffffff81322621 RBX: ffff888118b40000 RCX: ffff888117d7a600
RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff888118b41c9c
RBP: ffffc90000f6f518 R08: ffff888118b4003f R09: 1ffff11023168007
R10: dffffc0000000000 R11: ffffed1023168008 R12: ffff888118b40000
R13: dffffc0000000000 R14: ffff888118b41c9b R15: ffff888118b40000
FS:  00007f947a84d6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94798708c0 CR3: 0000000117144000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 nested_vmx_triple_fault+0x35/0x40 arch/x86/kvm/vmx/nested.c:5107
 vcpu_enter_guest arch/x86/kvm/x86.c:10814 [inline]
 vcpu_run+0x2221/0x7840 arch/x86/kvm/x86.c:11321
 kvm_arch_vcpu_ioctl_run+0x1167/0x1bd0 arch/x86/kvm/x86.c:11645
 kvm_vcpu_ioctl+0xa48/0x1000 virt/kvm/kvm_main.c:4515
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x132/0x1b0 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:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f947999aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f947a84d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9479c15fa0 RCX: 00007f947999aeb9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f9479a08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9479c16038 R14: 00007f9479c15fa0 R15: 00007ffd33b29ab8
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/02/03 01:42 android16-6.12 12691bc9c3f1 d78927dd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in nested_vmx_vmexit
2025/10/22 16:53 android16-6.12 0d6730ee6542 252fbbad .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in nested_vmx_vmexit
* Struck through repros no longer work on HEAD.