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=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 98651C3F68F for ; Tue, 17 Dec 2019 14:16:40 +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 71A782176D for ; Tue, 17 Dec 2019 14:16:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 71A782176D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=kamp.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:41054 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ihDeA-0005fW-5z for qemu-devel@archiver.kernel.org; Tue, 17 Dec 2019 09:16:22 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52187) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ihDcO-0003Pe-8K for qemu-devel@nongnu.org; Tue, 17 Dec 2019 09:14:33 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ihDcN-00061L-27 for qemu-devel@nongnu.org; Tue, 17 Dec 2019 09:14:31 -0500 Received: from kerio.kamp.de ([195.62.97.192]:40739) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ihDcM-00057O-RS; Tue, 17 Dec 2019 09:14:31 -0500 X-Footer: a2FtcC5kZQ== Received: from [172.21.12.60] ([172.21.12.60]) (authenticated user pl@kamp.de) by kerio.kamp.de with ESMTPSA (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256 bits)); Tue, 17 Dec 2019 15:14:19 +0100 To: qemu block , "qemu-devel@nongnu.org" From: Peter Lieven Subject: bdrv_co_pwritev: Assertion `!waited || !use_local_qiov' failed. Message-ID: <16b69066-cabb-3412-0005-886055352a05@kamp.de> Date: Tue, 17 Dec 2019 15:14:21 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 195.62.97.192 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: vsementsov@virtuozzo.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi all, I have a vserver running Qemu 4.0 that seems to reproducibly hit the following assertion:  bdrv_co_pwritev: Assertion `!waited || !use_local_qiov' failed. I noticed that the padding code was recently reworked in commit 2e2ad02f2c. In the new code I cannot find a similar assertion. Was the assertion wrong or why was it dropped? I try to add some debugging code to find out what is exactly happing. Especially the requests that are in flight when the assertion is triggered. Thanks, Peter