WARNING in x86_emulate

Title	Replies (including bot)	Last reply
[syzbot] [kvm-x86?] WARNING in x86_emulate_insn (2)	1 (3)	2025/11/24 21:13

Title

Replies (including bot)

Last reply

[syzbot] [kvm-x86?] WARNING in x86_emulate_insn (2)

1 (3)

2025/11/24 21:13

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-6-12	WARNING in x86_emulate_insn origin:upstream	-1	syz			1	14d	14d	0/1	premoderation: reported syz repro on 2026/03/03 07:34
upstream	WARNING in x86_emulate_insn kvm-x86	-1	C		error	309	2977d	3023d	0/29	closed as invalid on 2019/11/07 10:18

Rank 🛈

android-6-12

WARNING in x86_emulate_insn origin:upstream

-1

syz

14d

0/1

premoderation: reported syz repro on 2026/03/03 07:34

upstream

WARNING in x86_emulate_insn kvm-x86

-1

error

309

2977d

3023d

0/29

closed as invalid on 2019/11/07 10:18


Created	Duration	User	Repo	Result
2026/02/16 13:21	40m	retest repro	linux-next	report log
2026/02/16 13:12	31m	retest repro	linux-next	report log
2025/12/08 11:27	38m	retest repro	linux-next	report log
2025/11/24 20:20	23m	seanjc@google.com	https://github.com/sean-jc/linux.git x86/emulator_no_avx	report log

------------[ cut here ]------------ __ret WARNING: arch/x86/kvm/emulate.c:5560 at x86_emulate_insn+0x2a5f/0x43d0 arch/x86/kvm/emulate.c:5560, CPU#1: syz.2.45/6172 Modules linked in: CPU: 1 UID: 0 PID: 6172 Comm: syz.2.45 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:x86_emulate_insn+0x2a5f/0x43d0 arch/x86/kvm/emulate.c:5560 Code: 36 31 ff 44 89 f6 e8 80 26 7a 00 45 85 f6 0f 84 fb 01 00 00 e8 32 22 7a 00 41 be 01 00 00 00 e9 25 fd ff ff e8 22 22 7a 00 90 <0f> 0b 90 48 8b 44 24 70 80 3c 18 00 74 0a 48 8b 7c 24 58 e8 99 62 RSP: 0018:ffffc900037a76c0 EFLAGS: 00010293 RAX: ffffffff814bcbae RBX: dffffc0000000000 RCX: ffff8880349d9e80 RDX: 0000000000000000 RSI: 00000000000000ff RDI: 000000000000001f RBP: ffffc900037a77f0 R08: ffff8880349d9e80 R09: 0000000000000002 R10: 0000000000000006 R11: 0000000000000000 R12: 1ffff920006f4eec R13: dffffc0000000000 R14: 00000000000000ff R15: ffff88802a968000 FS: 00007f18cff2c6c0(0000) GS:ffff8881250f7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000002cea4000 CR4: 00000000003526f0 Call Trace: <TASK> x86_emulate_instruction+0xef0/0x2100 arch/x86/kvm/x86.c:9558 kvm_arch_vcpu_ioctl_run+0x17f7/0x20d0 arch/x86/kvm/x86.c:12008 kvm_vcpu_ioctl+0xa62/0xfd0 virt/kvm/kvm_main.c:4476 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f18cef9c799 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:00007f18cff2c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f18cf215fa0 RCX: 00007f18cef9c799 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00007f18cf032bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f18cf216038 R14: 00007f18cf215fa0 R15: 00007ffd5a47d688 </TASK>

Crashes (2):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/03/03 09:13	linux-next	d517cb8cea01	28b83e23	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci-upstream-rust-kasan-gce	WARNING in x86_emulate_insn
2025/11/24 10:36	linux-next	d724c6f85e80	4fb8ef37	.config	console log	report	syz / log	C		[disk image] [vmlinux] [kernel image]	ci-upstream-rust-kasan-gce	WARNING in x86_emulate_insn

Crashes (2):

Assets (help?)