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 B2DE0C4361B for ; Sat, 19 Dec 2020 23:31:47 +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 12E8D21BE5 for ; Sat, 19 Dec 2020 23:31:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 12E8D21BE5 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]:55456 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kqlhS-0005tu-1C for qemu-devel@archiver.kernel.org; Sat, 19 Dec 2020 18:31:46 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:51904) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kqlgT-0005MO-HR for qemu-devel@nongnu.org; Sat, 19 Dec 2020 18:30:45 -0500 Received: from indium.canonical.com ([91.189.90.7]:38242) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kqlgQ-0007He-FL for qemu-devel@nongnu.org; Sat, 19 Dec 2020 18:30:44 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1kqlgO-0007tk-Mg for ; Sat, 19 Dec 2020 23:30:40 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 9832E2E813A for ; Sat, 19 Dec 2020 23:30:40 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sat, 19 Dec 2020 23:21:10 -0000 From: =?utf-8?q?Andreas_K=2E_H=C3=BCttel?= <1906193@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: alistair2323 dilfridge X-Launchpad-Bug-Reporter: =?utf-8?q?Andreas_K=2E_H=C3=BCttel_=28dilfridge?= =?utf-8?q?=29?= X-Launchpad-Bug-Modifier: =?utf-8?q?Andreas_K=2E_H=C3=BCttel_=28dilfridge?= =?utf-8?q?=29?= References: <160669515259.21126.12178770886175022752.malonedeb@gac.canonical.com> Message-Id: <160842007086.3465.16116660255490173952.malone@wampee.canonical.com> Subject: [Bug 1906193] Re: riscv32 user mode emulation: fork return values broken 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="34b3ffd45c9543b7f7aa5aa313925241e9e7ca3f"; Instance="production" X-Launchpad-Hash: 4918fbbc2786d24965b6d5f55635c3ddfb19b806 Received-SPF: none client-ip=91.189.90.7; envelope-from=bounces@canonical.com; helo=indium.canonical.com 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=0.249, 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 1906193 <1906193@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Thanks a lot! Will test and post the result on monday when I'm back home. -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1906193 Title: riscv32 user mode emulation: fork return values broken Status in QEMU: New Bug description: When running in a chroot with riscv32 (on x86_64; qemu git master as of today): The following short program forks; the child immediately returns with exit(42). The parent checks for the return value - and obtains 40! gcc-10.2 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D #include #include #include #include main(c, v) int c; char **v; { pid_t pid, p; int s, i, n; s =3D 0; pid =3D fork(); if (pid =3D=3D 0) exit(42); /* wait for the process */ p =3D wait(&s); if (p !=3D pid) exit (255); if (WIFEXITED(s)) { int r=3DWEXITSTATUS(s); if (r!=3D42) { printf("child wants to return %i (0x%X), parent received %i (0x%X),= difference %i\n",42,42,r,r,r-42); } } } =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D (riscv-ilp32 chroot) farino /tmp # ./wait-test-short = child wants to return 42 (0x2A), parent received 40 (0x28), difference -2 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D (riscv-ilp32 chroot) farino /tmp # gcc --version gcc (Gentoo 10.2.0-r1 p2) 10.2.0 Copyright (C) 2020 Free Software Foundation, Inc. Dies ist freie Software; die Kopierbedingungen stehen in den Quellen. Es gibt KEINE Garantie; auch nicht f=C3=BCr MARKTG=C3=84NGIGKEIT oder F=C3= =9CR SPEZIELLE ZWECKE. (riscv-ilp32 chroot) farino /tmp # ld --version GNU ld (Gentoo 2.34 p6) 2.34.0 Copyright (C) 2020 Free Software Foundation, Inc. This program is free software; you may redistribute it under the terms of the GNU General Public License version 3 or (at your option) a later vers= ion. This program has absolutely no warranty. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1906193/+subscriptions