WARNING in kvm_arch_vcpu_ioctl_run

Status: upstream: reported C repro on 2023/04/09 03:02
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+412c9ae97b4338c5187e@syzkaller.appspotmail.com
First crash: 1213d, last: 3h09m
▶ ▼ Discussions (3)
Title Replies (including bot) Last reply
Re: [v5.15] WARNING in kvm_arch_vcpu_ioctl_run 1 (1) 2024/01/10 05:09
Re: [v5.15] WARNING in kvm_arch_vcpu_ioctl_run 1 (1) 2023/11/27 08:40
Re: [v5.15] WARNING in kvm_arch_vcpu_ioctl_run 3 (3) 2023/08/28 15:23
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/05/12 linux-5.15.y (ToT) b0ece631f84a C [report] WARNING in kvm_arch_vcpu_ioctl_run
2023/05/12 upstream (ToT) cc3c44c9fda2 C Didn't crash
▶ ▼ Similar bugs (11)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream WARNING in kvm_arch_vcpu_ioctl_run (5) kvm-x86 -1 syz, C error 343 1060d 1148d 23/29 fixed on 2023/10/12 12:47
upstream WARNING in kvm_arch_vcpu_ioctl_run (4) kvm-x86 -1 syz, C error 288 1153d 1236d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in kvm_arch_vcpu_ioctl_run (2) kvm-x86 -1 syz, C 61018 3108d 3197d 4/29 fixed on 2018/03/13 09:44
linux-6.6 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 syz, C done 2 325d 325d 2/2 fixed on 2025/10/19 16:15
upstream WARNING in kvm_arch_vcpu_ioctl_run (6) kvm-x86 -1 syz, C 117 301d 382d 29/29 fixed on 2025/10/29 21:02
upstream WARNING in kvm_arch_vcpu_ioctl_run -1 syz, C 20284 3234d 3299d 3/29 fixed on 2017/09/26 01:38
linux-4.14 WARNING in kvm_arch_vcpu_ioctl_run -1 syz, C inconclusive 71 1419d 2596d 0/1 upstream: reported C repro on 2019/06/25 23:07
upstream WARNING in kvm_arch_vcpu_ioctl_run (3) kvm-x86 -1 syz, C done error 16157 1257d 3051d 22/29 fixed on 2023/02/24 13:50
linux-4.19 WARNING in kvm_arch_vcpu_ioctl_run -1 syz, C error 116 1329d 2604d 0/1 upstream: reported C repro on 2019/06/17 10:07
android-6-12 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 syz, C 51 281d 383d 0/1 premoderation: reported C repro on 2025/07/17 01:43
linux-6.1 WARNING in kvm_arch_vcpu_ioctl_run origin:lts-only -1 syz, C done 1567 1d08h 1229d 0/3 upstream: reported C repro on 2023/03/23 13:22
▶ ▼ Fix bisection attempts (1)
Created Duration User Patch Repo Result
2024/01/10 23:47 1h01m fix candidate upstream OK (0) job log

Sample crash report:
L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details.
kvm: vcpu 1: requested lapic timer restore with starting count register 0x390=3966564501 (7933129002 ns) > initial count (7656495500 ns). Using initial count to start timer.
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4328 at arch/x86/kvm/x86.c:10372 kvm_arch_vcpu_ioctl_run+0x1bc4/0x1f40 arch/x86/kvm/x86.c:10372
Modules linked in:
CPU: 0 PID: 4328 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:kvm_arch_vcpu_ioctl_run+0x1bc4/0x1f40 arch/x86/kvm/x86.c:10372
Code: e8 a1 18 af 00 e9 03 e9 ff ff 44 89 f9 80 e1 07 38 c1 0f 8c d5 ed ff ff 4c 89 ff e8 86 18 af 00 e9 c8 ed ff ff e8 dc f9 69 00 <0f> 0b e9 31 fd ff ff 44 89 f9 80 e1 07 38 c1 0f 8c d2 ed ff ff 4c
RSP: 0018:ffffc90002f4fc30 EFLAGS: 00010293
RAX: ffffffff810f3ab4 RBX: ffff88802099c000 RCX: ffff888027190000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88802099c000
RBP: 0000000000000000 R08: ffffffff8d89f02f R09: 1ffffffff1b13e05
R10: dffffc0000000000 R11: fffffbfff1b13e06 R12: ffff8880236b7001
R13: 1ffff1100413381e R14: ffff88802099c0f0 R15: ffff8880236b7000
FS:  0000555562a15500(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ed3b213db0 CR3: 0000000026393000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kvm_vcpu_ioctl+0x8f7/0xc10 virt/kvm/kvm_main.c:3894
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f15f106add9
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:00007ffe01531be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f15f12e3fa0 RCX: 00007f15f106add9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f15f1100d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f15f12e3fac R14: 00007f15f12e3fa0 R15: 00007f15f12e3fa0
 </TASK>

Crashes (2035):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/05/09 16:58 linux-5.15.y de8dfb3f0278 29233ece .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/04 12:54 linux-5.15.y 91d48252ad4b 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/03/22 11:34 linux-5.15.y 91d48252ad4b 5b92003d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/12/11 15:00 linux-5.15.y 68efe5a6c16a d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/09/02 09:07 linux-5.15.y 01879f56bdde 807a3b61 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/05/25 07:14 linux-5.15.y 98f47d0e9b8c ed351ea7 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2025/02/23 13:49 linux-5.15.y c16c81c81336 d34966d1 .config console log report syz / log C [disk image] [vmlinux] [kernel image] [mounted in repro] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/11/09 12:48 linux-5.15.y 3c17fc483905 6b856513 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/07/31 15:25 linux-5.15.y 7e89efd3ae1c 6fde257d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/04/20 08:50 linux-5.15.y c52b9710c83d af24b050 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2024/01/11 05:40 linux-5.15.y 26c690eff0a5 04815ef1 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/05/05 08:28 linux-5.15.y 8a7f2a5c5aa1 518a39a6 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/07/12 12:11 linux-5.15.y d54cfc420586 2f19aa4f .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/06/25 11:58 linux-5.15.y f67653019430 79782afc .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/05/29 11:21 linux-5.15.y 1fe619a7d252 cf184559 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/05/15 00:06 linux-5.15.y b0ece631f84a 2b9ba477 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/04 04:05 linux-5.15.y 6e2fd6534337 9451e17e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/02 20:47 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/02 13:16 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/02 12:09 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/02 06:17 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/08/01 05:33 linux-5.15.y 6e2fd6534337 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/31 20:45 linux-5.15.y 6e2fd6534337 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/29 22:49 linux-5.15.y 674f684f7c61 6ef5c1e2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/28 19:51 linux-5.15.y 674f684f7c61 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/28 18:23 linux-5.15.y 674f684f7c61 edc8a875 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/28 09:29 linux-5.15.y 674f684f7c61 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/27 17:57 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/27 17:46 linux-5.15.y 674f684f7c61 aae9036b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/26 10:23 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/25 07:39 linux-5.15.y 674f684f7c61 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/24 20:53 linux-5.15.y 674f684f7c61 dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/24 06:14 linux-5.15.y c86c4726e7f0 544adce9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/22 18:25 linux-5.15.y c86c4726e7f0 4a865b71 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/22 09:47 linux-5.15.y c86c4726e7f0 b561ce9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/21 04:52 linux-5.15.y c86c4726e7f0 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/21 02:32 linux-5.15.y c86c4726e7f0 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/20 22:05 linux-5.15.y c86c4726e7f0 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/20 21:15 linux-5.15.y c86c4726e7f0 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/20 14:57 linux-5.15.y c86c4726e7f0 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/19 13:12 linux-5.15.y c86c4726e7f0 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/19 10:29 linux-5.15.y c86c4726e7f0 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/18 18:24 linux-5.15.y c86c4726e7f0 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/18 12:06 linux-5.15.y c86c4726e7f0 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/18 09:40 linux-5.15.y c86c4726e7f0 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/17 23:07 linux-5.15.y c86c4726e7f0 8aaff637 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/17 01:45 linux-5.15.y c86c4726e7f0 71b49442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/15 21:35 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/15 14:27 linux-5.15.y c86c4726e7f0 a4ed0f4f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/15 06:41 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/15 04:16 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/14 18:04 linux-5.15.y c86c4726e7f0 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 13:59 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 05:18 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 05:18 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 02:37 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/12 01:36 linux-5.15.y c86c4726e7f0 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/10 23:38 linux-5.15.y c86c4726e7f0 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/10 19:59 linux-5.15.y c86c4726e7f0 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/09 06:35 linux-5.15.y c86c4726e7f0 b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/07/09 05:09 linux-5.15.y c86c4726e7f0 b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2023/04/09 03:02 linux-5.15.y d86dfc4d95cd 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
* Struck through repros no longer work on HEAD.