From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 76127C433ED for ; Mon, 10 May 2021 05:42:30 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7E73661075 for ; Mon, 10 May 2021 05:42:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7E73661075 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=bugs.launchpad.net Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:48886 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lfygW-00028t-CT for qemu-devel@archiver.kernel.org; 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status=Confirmed; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: i386 tcg X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: aaro-koskinen philmd X-Launchpad-Bug-Reporter: Aaro Koskinen (aaro-koskinen) X-Launchpad-Bug-Modifier: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9_=28philmd?= =?utf-8?q?=29?= References: <161624570188.19824.1091833072893020317.malonedeb@wampee.canonical.com> Message-Id: <162062489848.10201.1434216440641956846.malone@chaenomeles.canonical.com> Subject: [Bug 1920602] Re: QEMU crash after a QuickBASIC program integer overflow X-Launchpad-Message-Rationale: Subscriber (QEMU) @qemu-devel-ml X-Launchpad-Message-For: qemu-devel-ml Precedence: bulk X-Generated-By: Launchpad (canonical.com); Revision="dccd804998035922efb3da0a725ecc923e2255f3"; Instance="production" X-Launchpad-Hash: 9bcf228ff5d622bca46f611b594f67f1a993716d Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-Spam_score_int: -66 X-Spam_score: -6.7 X-Spam_bar: ------ X-Spam_report: (-6.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Bug 1920602 <1920602@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" FErr# IRQ raise since bf13bfab084 ("i386: implement IGNNE"): Change the handling of port F0h writes and FPU exceptions to implement IG= NNE. = The implementation mixes a bit what the chipset and processor do in real hardware, but the effect is the same as what happens with actual FERR# and IGNNE# pins: writing to port F0h asserts IGNNE# in addition to loweri= ng FP_IRQ; while clearing the SE bit in the FPU status word deasserts IGNNE#. -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1920602 Title: QEMU crash after a QuickBASIC program integer overflow Status in QEMU: Confirmed Bug description: A trivial program compiled with QuickBASIC 4.5 with integer overflow will crash QEMU when ran under MS-DOS 5.0 or FreeDOS 1.2: C:\KILLER>type killer.bas A% =3D VAL("99999"):PRINT A% C:\KILLER>killer.exe ** =C2=A0=C2=A0ERROR:../qemu-5.2.0/accel/tcg/tcg-cpus.c:541:tcg_handle_inter= rupt: assertion failed: (qemu_mutex_iothread_locked()) Aborted QEMU version v5.2, compiler for ARM, and started with command line: qemu-system-i386 -curses -cpu 486 -m 1 -drive dos.img The same test under Ubuntu QEMU and KVM/x86_64 (QEMU emulator version 4.2.1 (Debian 1:4.2-3ubuntu6.14)) will just silently hang the QEMU. On DOSBOX, the machine does not die and program outputs the value -31073. The EXE to reproduce the issue is attached. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1920602/+subscriptions