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: 149d, last: 3d02h
Bug presence (2)
Date Name Commit Repro Result
2025/08/28 lts (merge base) 259f4977409c C [report] WARNING in vcpu_run
2025/08/28 upstream (ToT) 07d9df80082b C [report] WARNING in vcpu_run
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in vcpu_run kvm-x86 -1 C done 43 10d 455d 2/29 upstream: reported C repro on 2024/10/25 16:30
Last patch testing requests (6)
Created Duration User Patch Repo Result
2025/12/26 04:02 4m retest repro android16-6.12 error
2025/12/01 05:57 3m retest repro android16-6.12 error
2025/12/01 05:57 3m retest repro android16-6.12 error
2025/10/15 04:16 9m retest repro android16-6.12 report log
2025/09/22 04:11 9m retest repro android16-6.12 report log
2025/09/22 04:11 10m retest repro android16-6.12 report log

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 386 at arch/x86/kvm/x86.c:11253 vcpu_block arch/x86/kvm/x86.c:11253 [inline]
WARNING: CPU: 0 PID: 386 at arch/x86/kvm/x86.c:11253 vcpu_run+0x759d/0x7840 arch/x86/kvm/x86.c:11297
Modules linked in:
CPU: 0 UID: 0 PID: 386 Comm: syz.2.17 Not tainted syzkaller #0 bfede744b46277b76d69ebe6cb8c22209d769bcb
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:vcpu_block arch/x86/kvm/x86.c:11253 [inline]
RIP: 0010:vcpu_run+0x759d/0x7840 arch/x86/kvm/x86.c:11297
Code: 1f 48 83 c3 20 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 5c 02 00 00 44 88 33 eb 78 e8 1a e3 6a 00 eb 71 e8 13 e3 6a 00 <0f> 0b 4d 89 f5 eb 65 e8 07 e3 6a 00 48 8b 84 24 b8 00 00 00 42 80
RSP: 0018:ffffc90000f7f540 EFLAGS: 00010293
RAX: ffffffff811ca2fd RBX: 00000000fffffff0 RCX: ffff888110321300
RDX: 0000000000000000 RSI: 00000000fffffff0 RDI: 00000000fffffff0
RBP: ffffc90000f7f9d0 R08: ffff888113c872e7 R09: 1ffff11022790e5c
R10: dffffc0000000000 R11: ffffed1022790e5d R12: dffffc0000000000
R13: ffff88812a72455c R14: dffffc0000000000 R15: ffff88812a724300
FS:  00007f7cc03bd6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7cc03bcff8 CR3: 0000000116c1a000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 kvm_arch_vcpu_ioctl_run+0x1167/0x1bd0 arch/x86/kvm/x86.c:11619
 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:52 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f7cc059acb9
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:00007f7cc03bd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7cc0816180 RCX: 00007f7cc059acb9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f7cc0608bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7cc0816218 R14: 00007f7cc0816180 R15: 00007fff38b7a7e8
 </TASK>
---[ end trace 0000000000000000 ]---

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
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
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
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
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 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.