syzbot


WARNING in vcpu_run (2)

Status: upstream: reported C repro on 2026/06/20 03:58
Subsystems: kvm-x86
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+dd769db18693736eee89@syzkaller.appspotmail.com
First crash: 3d16h, last: 3d07h
Cause bisection: failed (error log, bisect log)
  
✨ AI Patch Versions (1)
Version Stage Reported Report Link Job
1 moderation 2026/06/22 16:19 Discussion 8568ceee-8527-4f42-b840-1fd49498df2e
✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision Error
8568ceee-8527-4f42-b840-1fd49498df2e patching WARNING in vcpu_run (2) 2026/06/22 15:00 2026/06/22 15:00 2026/06/22 16:19 5a630be623a83f54a0e7a5a72d78827acdc85248

			
		
9f360c20-4096-4858-8b3d-27f4baed5163 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ✅ VMHostTrigger: ❌ WARNING in vcpu_run (2) 2026/06/20 00:07 2026/06/20 00:07 2026/06/20 00:50 023e42b533e586523329e56d8cc833583d338ca9

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kvm-x86?] WARNING in vcpu_run (2) 0 (1) 2026/06/20 03:58
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in vcpu_run kvm-x86 -1 C done 43 159d 605d 29/29 fixed on 2026/05/06 16:40
android-6-12 WARNING in vcpu_run origin:upstream -1 C 12 3d07h 299d 0/1 premoderation: reported C repro on 2025/08/27 20:44

Sample crash report:
------------[ cut here ]------------
irq == -1
WARNING: arch/x86/kvm/x86.c:10860 at kvm_check_and_inject_events arch/x86/kvm/x86.c:10860 [inline], CPU#0: syz.4.1716/11103
WARNING: arch/x86/kvm/x86.c:10860 at vcpu_enter_guest arch/x86/kvm/x86.c:11356 [inline], CPU#0: syz.4.1716/11103
WARNING: arch/x86/kvm/x86.c:10860 at vcpu_run+0x57ec/0x7950 arch/x86/kvm/x86.c:11770, CPU#0: syz.4.1716/11103
Modules linked in:
CPU: 0 UID: 0 PID: 11103 Comm: syz.4.1716 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:kvm_check_and_inject_events arch/x86/kvm/x86.c:10860 [inline]
RIP: 0010:vcpu_enter_guest arch/x86/kvm/x86.c:11356 [inline]
RIP: 0010:vcpu_run+0x57ec/0x7950 arch/x86/kvm/x86.c:11770
Code: b5 ff ff 89 d1 80 e1 07 38 c1 0f 8c 64 b1 ff ff 48 8b 7c 24 58 e8 a4 66 eb 00 48 8b 54 24 58 e9 50 b1 ff ff e8 b5 47 7e 00 90 <0f> 0b 90 4c 8b 64 24 10 e9 4c e7 ff ff e8 a2 47 7e 00 90 0f 0b 90
RSP: 0018:ffffc90006e375e0 EFLAGS: 00010293
RAX: ffffffff8147d98b RBX: ffff88805b402cc0 RCX: ffff88807bca5d00
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: ffffc90006e379b0 R08: ffff88805b402c57 R09: 1ffff1100b68058a
R10: dffffc0000000000 R11: ffffed100b68058b R12: 00000000ffffffff
R13: ffff88805b402ca0 R14: 0000000000000001 R15: dffffc0000000000
FS:  0000555579916500(0000) GS:ffff88812525d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c74672780 CR3: 0000000075b22000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 kvm_arch_vcpu_ioctl_run+0x1193/0x2070 arch/x86/kvm/x86.c:12125
 kvm_vcpu_ioctl+0xa61/0xfd0 virt/kvm/kvm_main.c:4470
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c7479ce59
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:00007ffdeb74dbf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1c74a15fa0 RCX: 00007f1c7479ce59
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00007f1c74832e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c74a15fac R14: 00007f1c74a15fa0 R15: 00007f1c74a15fa0
 </TASK>

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/19 15:39 upstream 8c13415c8a43 d7ffd47b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in vcpu_run
2026/06/19 13:34 upstream 8c13415c8a43 d7ffd47b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in vcpu_run
2026/06/19 11:28 upstream 8c13415c8a43 d7ffd47b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in vcpu_run
2026/06/19 09:16 upstream 8c13415c8a43 d7ffd47b .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in vcpu_run
2026/06/19 07:07 upstream 8c13415c8a43 d7ffd47b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce WARNING in vcpu_run
* Struck through repros no longer work on HEAD.