syzbot


WARNING in vcpu_run

Status: premoderation: reported C repro on 2025/08/27 20:44
Bug presence: origin:upstream
[Documentation on labels]
Reported-by: syzbot+def2445f26d2611b4933@syzkaller.appspotmail.com
First crash: 302d, last: 2d09h
Bug presence (2)
Date Name Commit Repro Result
2026/06/11 lts (merge base) e7a3953084a7 C [report] lost connection to test machine
2026/06/11 upstream (ToT) 9716c086c8e8 C [report] lost connection to test machine
Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in vcpu_run (2) kvm-x86 prio:high -1 C error 5 6d15h 6d02h 0/29 upstream: reported C repro on 2026/06/20 03:58
upstream WARNING in vcpu_run kvm-x86 -1 C done 43 163d 608d 29/29 fixed on 2026/05/06 16:40
Last patch testing requests (8)
Created Duration User Patch Repo Result
2026/05/22 23:36 16m retest repro android16-6.12 log
2026/04/25 08:47 27m retest repro android16-6.12 OK log
2026/04/25 08:47 21m retest repro android16-6.12 OK log
2026/04/25 08:47 30m retest repro android16-6.12 OK log
2026/04/25 08:47 22m retest repro android16-6.12 OK log
2026/03/06 05:19 9m retest repro android16-6.12 report log
2026/02/09 07:53 10m retest repro android16-6.12 report log
2026/02/09 07:53 7m retest repro android16-6.12 report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1710 at arch/x86/kvm/x86.c:10488 kvm_check_and_inject_events arch/x86/kvm/x86.c:10488 [inline]
WARNING: CPU: 0 PID: 1710 at arch/x86/kvm/x86.c:10488 vcpu_enter_guest arch/x86/kvm/x86.c:10937 [inline]
WARNING: CPU: 0 PID: 1710 at arch/x86/kvm/x86.c:10488 vcpu_run+0x5ad4/0x78e0 arch/x86/kvm/x86.c:11335
Modules linked in:
CPU: 0 UID: 0 PID: 1710 Comm: syz.3.453 Not tainted syzkaller #0 471281939cd7bfdfff4c6b6074d5d68627c837ba
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:10488 [inline]
RIP: 0010:vcpu_enter_guest arch/x86/kvm/x86.c:10937 [inline]
RIP: 0010:vcpu_run+0x5ad4/0x78e0 arch/x86/kvm/x86.c:11335
Code: 24 10 e9 6c ae ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 94 ae ff ff 4c 89 ff e8 c6 d9 c3 00 e9 87 ae ff ff e8 8c 26 6b 00 <0f> 0b 4d 89 fc e9 0c f2 ff ff e8 7d 26 6b 00 0f 0b e9 00 f2 ff ff
RSP: 0018:ffffc90002fef540 EFLAGS: 00010293
RAX: ffffffff811c9b24 RBX: 00000000ffffffff RCX: ffff88811c708000
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: ffffc90002fef9d0 R08: ffff88811db444b7 R09: 1ffff11023b68896
R10: dffffc0000000000 R11: ffffed1023b68897 R12: ffff88811db44300
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88811db44300
FS:  0000555574c7c500(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb277e72780 CR3: 0000000104386000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 kvm_arch_vcpu_ioctl_run+0x1167/0x1bd0 arch/x86/kvm/x86.c:11659
 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: 0033:0x7fb277f9ce59
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:00007fff422a21e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb278215fa0 RCX: 00007fb277f9ce59
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fb278032e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb278215fac R14: 00007fb278215fa0 R15: 00007fb278215fa0
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/19 15:40 android16-6.12 8f68185b8289 570c59ee .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/09/29 10:47 android16-6.12 4560d0e9d5a5 001c9061 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2026/06/23 21:22 android16-6.12 8f68185b8289 4b1d8f01 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2026/04/09 19:50 android16-6.12 52e4cd7f0a1a 38c8e246 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2026/01/21 09:17 android16-6.12 f33ca06267f8 6f1aa2f9 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2026/01/21 07:39 android16-6.12 f33ca06267f8 6f1aa2f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2026/01/21 07:39 android16-6.12 f33ca06267f8 6f1aa2f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/09/08 03:02 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/09/08 03:02 android16-6.12 ad3375325ca2 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/08/27 21:45 android16-6.12 c17d1926681a e12e5ba4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/08/27 21:16 android16-6.12 c17d1926681a e12e5ba4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/08/27 20:44 android16-6.12 c17d1926681a e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
2025/08/27 20:43 android16-6.12 c17d1926681a e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust WARNING in vcpu_run
* Struck through repros no longer work on HEAD.