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=-8.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 B0075C56201 for ; Wed, 11 Nov 2020 10:27:05 +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 809D620759 for ; Wed, 11 Nov 2020 10:27:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 809D620759 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]:43450 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kcnLD-0001Ob-77 for qemu-devel@archiver.kernel.org; Wed, 11 Nov 2020 05:27:03 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:36186) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kcnJr-0000kp-21 for qemu-devel@nongnu.org; Wed, 11 Nov 2020 05:25:39 -0500 Received: from indium.canonical.com ([91.189.90.7]:51704) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kcnJo-00043D-B3 for qemu-devel@nongnu.org; Wed, 11 Nov 2020 05:25:38 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1kcnJm-0000v5-FJ for ; Wed, 11 Nov 2020 10:25:34 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 7006B2E80AB for ; Wed, 11 Nov 2020 10:25:34 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 11 Nov 2020 10:19:23 -0000 From: Boris <1903833@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=New; importance=Undecided; assignee=None; X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: ulasevich X-Launchpad-Bug-Reporter: Boris (ulasevich) X-Launchpad-Bug-Modifier: Boris (ulasevich) Message-Id: <160508996361.28374.9424687449463676251.malonedeb@gac.canonical.com> Subject: [Bug 1903833] [NEW] User mode qemu-aarch: SIGGSEGV signal handler works wrong 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="c11d702c7d7f4a497cdcc277027f1662d395603f"; Instance="production" X-Launchpad-Hash: b8b8adee2851e7ef10a64be8b28c9c3cb1f9b900 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/11 05:25:34 X-ACL-Warn: Detected OS = Linux 3.11 and newer [fuzzy] X-Spam_score_int: -65 X-Spam_score: -6.6 X-Spam_bar: ------ X-Spam_report: (-6.6 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.25, RCVD_IN_DNSWL_HI=-5, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, 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 1903833 <1903833@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Public bug reported: I have a user mode qemu-aarch issue. Program with SIGSEGV signal handler wo= rks wrong under qemu-aarch: = once the progam handles the SEGV signal, qemu marks the program's page prot= ected, and signal handler gets SEGV on each subsequent memory access instru= ction within a program. The issue is reproduced on WSL Ubuntu 20.04 under Windows 10, qemu-aarch64 = version 5.1.50 The issue is also reproducible on the latest upstream qemu-aarch build. The following workaround disables mprotect call and fixes the issue: https://github.com/BorisUlasevich/qemu/commit/3063d9a64f8395185d65c6b6710d2= 8ee92cd8be5 The issue can be reproduced on OpenJDK which reports SIGSEGV immediately after start. The small reproducer program is attached. ** Affects: qemu Importance: Undecided Status: New ** Attachment added: "minimal reproducers for the issue" https://bugs.launchpad.net/bugs/1903833/+attachment/5433337/+files/test.= cpp -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1903833 Title: User mode qemu-aarch: SIGGSEGV signal handler works wrong Status in QEMU: New Bug description: I have a user mode qemu-aarch issue. Program with SIGSEGV signal handler = works wrong under qemu-aarch: = once the progam handles the SEGV signal, qemu marks the program's page pr= otected, and signal handler gets SEGV on each subsequent memory access inst= ruction within a program. The issue is reproduced on WSL Ubuntu 20.04 under Windows 10, qemu-aarch6= 4 version 5.1.50 The issue is also reproducible on the latest upstream qemu-aarch build. The following workaround disables mprotect call and fixes the issue: https://github.com/BorisUlasevich/qemu/commit/3063d9a64f8395185d65c6b6710= d28ee92cd8be5 The issue can be reproduced on OpenJDK which reports SIGSEGV immediately after start. The small reproducer program is attached. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1903833/+subscriptions