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charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in x86_emulate_insn ------------[ cut here ]------------ WARNING: arch/x86/kvm/emulate.c:5433 at x86_emulate_insn+0x265f/0x3bd0 arch/x86/kvm/emulate.c:5433, CPU#0: syz.2.670/9601 Modules linked in: CPU: 0 UID: 0 PID: 9601 Comm: syz.2.670 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:x86_emulate_insn+0x265f/0x3bd0 arch/x86/kvm/emulate.c:5433 Code: 00 41 8b 2e 31 ff 89 ee e8 ee 83 77 00 85 ed 0f 84 f4 01 00 00 e8 a1 7f 77 00 bd 01 00 00 00 e9 9d f9 ff ff e8 92 7f 77 00 90 <0f> 0b 90 48 8b 44 24 28 42 80 3c 28 00 74 08 4c 89 e7 e8 7a 1b de RSP: 0018:ffffc90003327748 EFLAGS: 00010293 RAX: ffffffff814a79de RBX: ffff888027c7e270 RCX: ffff88802f2abd00 RDX: 0000000000000000 RSI: 00000000000000ff RDI: 000000000000001f RBP: 00000000000000ff R08: ffff88802f2abd00 R09: 0000000000000002 R10: 0000000000000006 R11: 0000000000000000 R12: ffff888027c7e278 R13: dffffc0000000000 R14: ffff888027c7e2a0 R15: 0000000000000000 FS: 00007fd173f646c0(0000) GS:ffff888125a6f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007741a000 CR4: 00000000003526f0 Call Trace: x86_emulate_instruction+0xea7/0x20b0 arch/x86/kvm/x86.c:9512 kvm_arch_vcpu_ioctl_run+0x1404/0x1cd0 arch/x86/kvm/x86.c:11951 kvm_vcpu_ioctl+0x99a/0xed0 virt/kvm/kvm_main.c:4477 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+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd17318f749 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd173f64038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd1733e6090 RCX: 00007fd17318f749 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005 RBP: 00007fd173213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd1733e6128 R14: 00007fd1733e6090 R15: 00007ffe5ab25448 Tested on: commit: 380ecf40 Revert "KVM: x86: Add support for emulating M.. git tree: https://github.com/sean-jc/linux.git x86/emulator_no_avx console output: https://syzkaller.appspot.com/x/log.txt?x=155af97c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=763fb984aa266726 dashboard link: https://syzkaller.appspot.com/bug?extid=fa52a184ebce1b30ad49 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 Note: no patches were applied.