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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: 1143d, last: 19h09m
▶ ▼ 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 C error 343 991d 1078d 23/29 fixed on 2023/10/12 12:47
upstream WARNING in kvm_arch_vcpu_ioctl_run (4) kvm-x86 -1 C error 288 1083d 1167d 22/29 fixed on 2023/06/08 14:41
upstream WARNING in kvm_arch_vcpu_ioctl_run (2) kvm-x86 -1 C 61018 3039d 3128d 4/29 fixed on 2018/03/13 09:44
linux-6.6 WARNING in kvm_arch_vcpu_ioctl_run origin:upstream -1 C done 2 255d 255d 2/2 fixed on 2025/10/19 16:15
upstream WARNING in kvm_arch_vcpu_ioctl_run (6) kvm-x86 -1 C 117 232d 313d 29/29 fixed on 2025/10/29 21:02
upstream WARNING in kvm_arch_vcpu_ioctl_run -1 C 20284 3164d 3229d 3/29 fixed on 2017/09/26 01:38
linux-4.14 WARNING in kvm_arch_vcpu_ioctl_run -1 C inconclusive 71 1350d 2526d 0/1 upstream: reported C repro on 2019/06/25 23:07
upstream WARNING in kvm_arch_vcpu_ioctl_run (3) kvm-x86 -1 C done error 16157 1188d 2981d 22/29 fixed on 2023/02/24 13:50
linux-4.19 WARNING in kvm_arch_vcpu_ioctl_run -1 C error 116 1259d 2535d 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 C 51 212d 313d 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 C done 1463 1d00h 1160d 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 (1865):
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
2026/05/26 02:21 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/25 16:28 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/25 13:04 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/25 12:59 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/25 03:26 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/24 18:45 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/24 01:38 linux-5.15.y 241d66fa280c c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/21 23:18 linux-5.15.y 93741761e5e3 e195359d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/21 18:35 linux-5.15.y 93741761e5e3 e195359d .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/20 06:31 linux-5.15.y 93741761e5e3 0909d65f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/18 14:24 linux-5.15.y 93741761e5e3 55156e84 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/18 01:06 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/17 19:10 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/17 02:48 linux-5.15.y 93741761e5e3 de5aae85 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/16 20:13 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/16 20:11 linux-5.15.y 93741761e5e3 a15a64a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/15 06:57 linux-5.15.y de8dfb3f0278 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/14 21:10 linux-5.15.y de8dfb3f0278 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/14 06:46 linux-5.15.y de8dfb3f0278 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/13 19:55 linux-5.15.y de8dfb3f0278 fec2a7ee .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/10 15:21 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/10 07:24 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/10 03:48 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/10 00:35 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/09 15:36 linux-5.15.y de8dfb3f0278 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/06 03:14 linux-5.15.y ef251c45f1cd 26da2c66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/05 19:31 linux-5.15.y ef251c45f1cd 06e69a27 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/05 05:38 linux-5.15.y ef251c45f1cd a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/04 16:04 linux-5.15.y ef251c45f1cd 85f1bcf2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/04 07:13 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/04 04:44 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/03 21:58 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/03 14:15 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/03 11:30 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/02 13:43 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/02 11:13 linux-5.15.y ef251c45f1cd a0d91488 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/02 06:05 linux-5.15.y ef251c45f1cd 753c55b9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/05/01 00:56 linux-5.15.y ef251c45f1cd a7464baf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/30 20:59 linux-5.15.y ef251c45f1cd a7464baf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/30 02:45 linux-5.15.y b9d57c40a767 005438fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/29 13:51 linux-5.15.y b9d57c40a767 7ca9e4d8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/28 13:29 linux-5.15.y b9d57c40a767 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/28 12:24 linux-5.15.y b9d57c40a767 ce741359 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kvm_arch_vcpu_ioctl_run
2026/04/27 17:07 linux-5.15.y b9d57c40a767 0f700595 .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.