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, URIBL_BLOCKED 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 C50E2C433B4 for ; Mon, 17 May 2021 19:27:01 +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 83B8861185 for ; Mon, 17 May 2021 19:27:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 83B8861185 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]:33646 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1liitI-0003E2-Jx for qemu-devel@archiver.kernel.org; Mon, 17 May 2021 15:27:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43386) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1liiKJ-00087m-2e for qemu-devel@nongnu.org; Mon, 17 May 2021 14:50:51 -0400 Received: from indium.canonical.com ([91.189.90.7]:47426) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1liiKB-0000ED-W6 for qemu-devel@nongnu.org; Mon, 17 May 2021 14:50:50 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.93 #5 (Debian)) id 1liiK9-0003mW-ST for ; Mon, 17 May 2021 18:50:41 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id AA1D82E8194 for ; Mon, 17 May 2021 18:50:41 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Mon, 17 May 2021 18:43:58 -0000 From: Thomas Huth <1883268@bugs.launchpad.net> To: qemu-devel@nongnu.org X-Launchpad-Notification-Type: bug X-Launchpad-Bug: product=qemu; status=Invalid; importance=Undecided; assignee=None; X-Launchpad-Bug-Tags: arm testcase X-Launchpad-Bug-Information-Type: Public X-Launchpad-Bug-Private: no X-Launchpad-Bug-Security-Vulnerability: no X-Launchpad-Bug-Commenters: christophe-lyon rth th-huth X-Launchpad-Bug-Reporter: Christophe Lyon (christophe-lyon) X-Launchpad-Bug-Modifier: Thomas Huth (th-huth) References: <159197267869.7647.15246075911938911102.malonedeb@gac.canonical.com> Message-Id: <162127703823.7753.17643999202116745448.malone@gac.canonical.com> Subject: [Bug 1883268] Re: random errors on aarch64 when executing __aarch64_cas8_acq_rel 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="5321c3f40fa4d4b847f4e47fb766e7b95ed5036c"; Instance="production" X-Launchpad-Hash: c3165c6abfe488a0f5df5a10b2b74a8c8da1f86a 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 1883268 <1883268@bugs.launchpad.net> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Thanks for moving the ticket to gitlab! ... so I'm closing this on Launchpad now. ** Changed in: qemu Status: Incomplete =3D> Invalid -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1883268 Title: random errors on aarch64 when executing __aarch64_cas8_acq_rel Status in QEMU: Invalid Bug description: Hello, Since I upgraded to qemu-5.0 when executing the GCC testsuite, I've noticed random failures of g++.dg/ext/sync-4.C. I'm attaching the source of the testcase, the binary executable and the qemu traces (huge, 111MB!) starting at main (with qemu-aarch64 -cpu cortex-a57 -R 0 -d in_asm,int,exec,cpu,unimp,guest_errors,nochain) The traces where generated by a CI build, I built the executable manually but I expect it to be the same as the one executed by CI. In seems the problem occurs in f13, which leads to a call to abort() The preprocessed version of f13/t13 are as follows: static bool f13 (void *p) __attribute__ ((noinline)); static bool f13 (void *p) { return (__sync_bool_compare_and_swap((ditype*)p, 1, 2)); } static void t13 () { try { f13(0); } catch (...) { return; } abort(); } = When looking at the execution traces at address 0x00400c9c, main calls f1= 3, which in turn calls __aarch64_cas8_acq_rel (at 0x00401084) __aarch64_cas8_acq_rel returns to f13 (address 0x0040113c), then f13 retu= rns to main (0x0040108c) which then calls abort (0x00400ca0) I'm not quite sure what's wrong :-( I've not noticed such random problems with native aarch64 hardware. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1883268/+subscriptions