From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f198.google.com (mail-il1-f198.google.com [209.85.166.198]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0AA6D79E2 for ; Wed, 21 Feb 2024 03:00:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708484429; cv=none; b=PRvKeVtKmz9bFCydUtBEvB7lV/K/SiT7zBft9MEfoqQIf1I1foi2vJNCH5T3G5T0GRvHhMS2Nk+ekTPaOWutGg/OFGc9mElUcWwVKHzeef0X0ed8r/+Bxrb16nFwW758IfPfymX+3K/WatZsj8BwwbkUDXtEkWZPhSKgYfkblu4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708484429; c=relaxed/simple; bh=rkLKCDZNjb6J0IiHPCSnK1SOv3Zj9iEVmYNgMObi7/Y=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=TagSFBjKPTiHqVbzwKeasVm1tSTR4xGWC+faaI9BgJveylx21ZnemBG2gu/5LqRRYEiHJzlQ1benuGGvqWs2uXx3V2vd5XCc6jrp3wN5Ng8ZJvQ3SsfWYUVA7aXkpXcPoVpurQbs6FyplEKPx9IZiqrRm93IJ70Ei8epAYU0ha0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.198 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f198.google.com with SMTP id e9e14a558f8ab-36424431577so47950175ab.3 for ; Tue, 20 Feb 2024 19:00:27 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708484427; x=1709089227; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=HKC2FBRzuJ/NpphNyy1cXiWj+k3pGRIjMpvVMN1CXGA=; b=sDXRqZG+rT81oPdqUWVFmLHqpKsn45C0YTlRS7yXRzuMDDaaXfoJh3ILZbnMOJK9sE 8+k98advB1T6c3qBJwt57IHon2JhlncnSTMLuSMaQqv2AoAiZWKJVBvub+EGjQ113DGQ FgHmyOPiHBHC7ovB1xoAujgInK0PspzWJ55Z4Zzaxcl/UTS7Rpoi/By9JBJIwxLpUYm8 iPcUxjQHjsY0b/dH0A3Gvz9Z5XKiYiTrVT11f17xDD+WejP5kh1GD/2Wr+bC18w/qjcD OvH4W9F/88ckkgXEE84q0xtBA0f4PzTsRzpOlpBxXZEZw4+u39U0j3Lm05/JkBnppHGw 5BNw== X-Forwarded-Encrypted: i=1; AJvYcCUDo1szlw04b0UVsjDLEpwM+aGB2FjZF9mYvwQ38oNDDFpJWnlveA+o0T21kek9U97Zu3UdkfvaHdVbRuOXePGhXX6O X-Gm-Message-State: AOJu0Yy3hJnMOzhk4MFJVkOo/8xiNspvAH4q659CT/fU8cX/xE4PvoT+ VDyriQ95WAInm2bjgEqMCex43IaYGl4w0EhfZDSjkgOtHMypIXIuubruczxRXkddzTsuomY6bqh k9pe4JoOm+Cp08fYRPiaHAR24snOQ1A81BUIQqQd3Wp6VQ2cVmPMFfaE= X-Google-Smtp-Source: AGHT+IFhevZLLMLv1IVMNBUKv01dHF2q9cfQse+2XCEwbDYmSERfOxBEyUgWtenQFYc/t3MOcpGbZpvWrk5sSN0cP3XHp8gbRQvt Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1889:b0:365:3355:38fe with SMTP id o9-20020a056e02188900b00365335538femr402622ilu.5.1708484427281; Tue, 20 Feb 2024 19:00:27 -0800 (PST) Date: Tue, 20 Feb 2024 19:00:27 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000647d640611db8789@google.com> Subject: [syzbot] [kvm?] KMSAN: uninit-value in em_ret_near_imm From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, pbonzini@redhat.com, seanjc@google.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 0f1dd5e91e2b Merge tag 'sound-6.8-rc5' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17bec778180000 kernel config: https://syzkaller.appspot.com/x/.config?x=e3dd779fba027968 dashboard link: https://syzkaller.appspot.com/bug?extid=c9aca2253922f806a75a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b6e52e101a62/disk-0f1dd5e9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/64025c9168bf/vmlinux-0f1dd5e9.xz kernel image: https://storage.googleapis.com/syzbot-assets/491e1a922dc9/bzImage-0f1dd5e9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c9aca2253922f806a75a@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in assign_eip_near arch/x86/kvm/emulate.c:829 [inline] BUG: KMSAN: uninit-value in em_ret_near_imm+0x13c/0x580 arch/x86/kvm/emulate.c:3192 assign_eip_near arch/x86/kvm/emulate.c:829 [inline] em_ret_near_imm+0x13c/0x580 arch/x86/kvm/emulate.c:3192 x86_emulate_insn+0x1d87/0x5880 arch/x86/kvm/emulate.c:5292 x86_emulate_instruction+0x13c9/0x30a0 arch/x86/kvm/x86.c:9175 kvm_emulate_instruction arch/x86/kvm/x86.c:9255 [inline] complete_emulated_io arch/x86/kvm/x86.c:11212 [inline] complete_emulated_mmio+0x70b/0x8b0 arch/x86/kvm/x86.c:11272 kvm_arch_vcpu_ioctl_run+0x1837/0xb890 arch/x86/kvm/x86.c:11384 kvm_vcpu_ioctl+0xbfc/0x1770 arch/x86/kvm/../../../virt/kvm/kvm_main.c:4441 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0x225/0x410 fs/ioctl.c:857 __x64_sys_ioctl+0x96/0xe0 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Local variable eip created at: em_ret_near_imm+0x3a/0x580 arch/x86/kvm/emulate.c:3189 x86_emulate_insn+0x1d87/0x5880 arch/x86/kvm/emulate.c:5292 CPU: 0 PID: 6232 Comm: syz-executor.3 Not tainted 6.8.0-rc4-syzkaller-00267-g0f1dd5e91e2b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 ===================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup