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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 558A3C2D0CD for ; Wed, 18 Dec 2019 15:10:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2CD122146E for ; Wed, 18 Dec 2019 15:10:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="giL2cRqi" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727189AbfLRPKV (ORCPT ); Wed, 18 Dec 2019 10:10:21 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:35388 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726922AbfLRPKU (ORCPT ); Wed, 18 Dec 2019 10:10:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576681819; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=QM58zRG2E33uopTi5C1OLZUP84XlNWgGlqpWQbuCIPw=; b=giL2cRqi7uySqBFzskBehkV1wUW21VtzT/szfQoPmHMZHhfhIp1sP6/YB/kt2YUmqaU3+i VmiHC6An73+bsyz9InEjx3FJ4+NH8ZgBN7a/qdgW5TUK6bYmbypN0enjkFYVAO/WgBfZnP Z3LounYvq1sOhEhXX+mh1L6n5qgA8Ws= Received: from mail-qt1-f200.google.com (mail-qt1-f200.google.com [209.85.160.200]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-262-u8ryBpnTP02wqiERj4m_Yw-1; Wed, 18 Dec 2019 10:10:16 -0500 X-MC-Unique: u8ryBpnTP02wqiERj4m_Yw-1 Received: by mail-qt1-f200.google.com with SMTP id e8so1568169qtg.9 for ; Wed, 18 Dec 2019 07:10:16 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=QM58zRG2E33uopTi5C1OLZUP84XlNWgGlqpWQbuCIPw=; b=VnCixpAETyJfVra0n10Gwb8SR8ihBQ18oX2LS26+LK437l7Mc/TqirwnRuPwkg/GcP kb0L7ETkji0EYclkdCGdCWtgQSOXZpMyUldN9zbqcqCLFKd/Z0xECU4hj8+wYtX5BeA1 j3W8BvlUkdYgmwFqRWIyIAubLatOidpSYwt6qCw6NkyQRsKmjVhsY+Ai60SNiJzX6gny rCxn1DQKgqktwW7JEEp+NUajTh2Q3d7PGwf/Yfy07G6ZSEnyounSfCaIJbUwKGDtJLlY f5MArOQpHUsAvmEC9kbprt2Pt/2teBIRLkVNc3oiFvEk/eCLrkK+TTOa/vRmRSBkncER uBIA== X-Gm-Message-State: APjAAAW+w7mxr57KyMIjMZl8tL160azXWzL8fyZ7MuliMCYWqvm5ZWn5 Q6tuHBNWSINih+DcmDJTRs5kCYrMwprP+hbMPRjMO6keXp3tkQ7CM++Xxv97TB2WqkTv8Z3fIkj 0kuyow1J0FYl/kuN1ER2kmxz9 X-Received: by 2002:a0c:e1ce:: with SMTP id v14mr2673046qvl.39.1576681816438; Wed, 18 Dec 2019 07:10:16 -0800 (PST) X-Google-Smtp-Source: APXvYqwhQfsc+4bORIeWfJPGw6vR+W11ECcHruYmI+Dy/4t2QYKRuVwYMstb8WaGcqyUqp1oBsusFQ== X-Received: by 2002:a0c:e1ce:: with SMTP id v14mr2673022qvl.39.1576681816185; Wed, 18 Dec 2019 07:10:16 -0800 (PST) Received: from redhat.com (bzq-79-181-48-215.red.bezeqint.net. [79.181.48.215]) by smtp.gmail.com with ESMTPSA id i19sm716606qki.124.2019.12.18.07.10.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Dec 2019 07:10:15 -0800 (PST) Date: Wed, 18 Dec 2019 10:10:11 -0500 From: "Michael S. Tsirkin" To: Christian Borntraeger Cc: "virtualization@lists.linux-foundation.org" , Stephen Rothwell , Linux Next Mailing List , "linux-kernel@vger.kernel.org" , kvm list , Halil Pasic Subject: Re: vhost changes (batched) in linux-next after 12/13 trigger random crashes in KVM guests after reboot Message-ID: <20191218100926-mutt-send-email-mst@kernel.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Dec 18, 2019 at 03:43:43PM +0100, Christian Borntraeger wrote: > Michael, > > with > commit db7286b100b503ef80612884453bed53d74c9a16 (refs/bisect/skip-db7286b100b503ef80612884453bed53d74c9a16) > vhost: use batched version by default > plus > commit 6bd262d5eafcdf8cdfae491e2e748e4e434dcda6 (HEAD, refs/bisect/bad) > Revert "vhost/net: add an option to test new code" > to make things compile (your next tree is not easily bisectable, can you fix that as well?). I'll try. > > I get random crashes in my s390 KVM guests after reboot. > Reverting both patches together with commit decd9b8 "vhost: use vhost_desc instead of vhost_log" to > make it compile again) on top of linux-next-1218 makes the problem go away. > > Looks like the batched version is not yet ready for prime time. Can you drop these patches until > we have fixed the issues? > > Christian > Will do, thanks for letting me know. -- MST