From nobody Thu May 1 04:13:25 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: <qemu-devel-bounces+importer=patchew.org@nongnu.org> Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1504168000349274.43569780676216; Thu, 31 Aug 2017 01:26:40 -0700 (PDT) Received: from localhost ([::1]:54486 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <qemu-devel-bounces+importer=patchew.org@nongnu.org>) id 1dnKoA-0000Ex-1p for importer@patchew.org; Thu, 31 Aug 2017 04:26:38 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42537) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <stefanha@redhat.com>) id 1dnKkQ-0005SW-3a for qemu-devel@nongnu.org; Thu, 31 Aug 2017 04:22:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <stefanha@redhat.com>) id 1dnKkP-0005vJ-5E for qemu-devel@nongnu.org; Thu, 31 Aug 2017 04:22:46 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38784) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from <stefanha@redhat.com>) id 1dnKkO-0005vD-VF for qemu-devel@nongnu.org; Thu, 31 Aug 2017 04:22:45 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 23D0D4024B; Thu, 31 Aug 2017 08:22:44 +0000 (UTC) Received: from localhost (ovpn-117-89.ams2.redhat.com [10.36.117.89]) by smtp.corp.redhat.com (Postfix) with ESMTP id 14BAF92D01; Thu, 31 Aug 2017 08:22:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 23D0D4024B Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=stefanha@redhat.com From: Stefan Hajnoczi <stefanha@redhat.com> To: <qemu-devel@nongnu.org> Date: Thu, 31 Aug 2017 09:22:04 +0100 Message-Id: <20170831082210.8362-10-stefanha@redhat.com> In-Reply-To: <20170831082210.8362-1-stefanha@redhat.com> References: <20170831082210.8362-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Thu, 31 Aug 2017 08:22:44 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL for-2.10 09/15] oslib-posix: Print errors before aborting on qemu_alloc_stack() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel/> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Cc: Peter Maydell <peter.maydell@linaro.org>, Eduardo Habkost <ehabkost@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com> Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+importer=patchew.org@nongnu.org> X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" From: Eduardo Habkost <ehabkost@redhat.com> If QEMU is running on a system that's out of memory and mmap() fails, QEMU aborts with no error message at all, making it hard to debug the reason for the failure. Add perror() calls that will print error information before aborting. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Philippe Mathieu-Daud=C3=A9 <f4bug@amsat.org> Tested-by: Philippe Mathieu-Daud=C3=A9 <f4bug@amsat.org> Message-id: 20170829212053.6003-1-ehabkost@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- util/oslib-posix.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/util/oslib-posix.c b/util/oslib-posix.c index cacf0ef5e3..80086c549f 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -530,6 +530,7 @@ void *qemu_alloc_stack(size_t *sz) ptr =3D mmap(NULL, *sz, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); if (ptr =3D=3D MAP_FAILED) { + perror("failed to allocate memory for stack"); abort(); } =20 @@ -544,6 +545,7 @@ void *qemu_alloc_stack(size_t *sz) guardpage =3D ptr; #endif if (mprotect(guardpage, pagesz, PROT_NONE) !=3D 0) { + perror("failed to set up stack guard page"); abort(); } =20 --=20 2.13.5