From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:34392)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <borntraeger@de.ibm.com>) id 1aTQzQ-0001iF-Ut
	for qemu-devel@nongnu.org; Wed, 10 Feb 2016 04:23:13 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <borntraeger@de.ibm.com>) id 1aTQzN-00039Z-Nq
	for qemu-devel@nongnu.org; Wed, 10 Feb 2016 04:23:12 -0500
Received: from e06smtp10.uk.ibm.com ([195.75.94.106]:34379)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <borntraeger@de.ibm.com>) id 1aTQzN-00039M-Eu
	for qemu-devel@nongnu.org; Wed, 10 Feb 2016 04:23:09 -0500
Received: from localhost
	by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use
	Only! Violators will be prosecuted
	for <qemu-devel@nongnu.org> from <borntraeger@de.ibm.com>;
	Wed, 10 Feb 2016 09:23:07 -0000
Received: from b06cxnps4075.portsmouth.uk.ibm.com
	(d06relay12.portsmouth.uk.ibm.com [9.149.109.197])
	by d06dlp01.portsmouth.uk.ibm.com (Postfix) with ESMTP id A4F4517D8069
	for <qemu-devel@nongnu.org>; Wed, 10 Feb 2016 09:23:18 +0000 (GMT)
Received: from d06av10.portsmouth.uk.ibm.com (d06av10.portsmouth.uk.ibm.com
	[9.149.37.251])
	by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with
	ESMTP id u1A9N3W610158492
	for <qemu-devel@nongnu.org>; Wed, 10 Feb 2016 09:23:03 GMT
Received: from d06av10.portsmouth.uk.ibm.com (localhost [127.0.0.1])
	by d06av10.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with
	ESMTP id u1A8N4mj013723
	for <qemu-devel@nongnu.org>; Wed, 10 Feb 2016 01:23:04 -0700
From: Christian Borntraeger <borntraeger@de.ibm.com>
Message-ID: <56BB0176.4040408@de.ibm.com>
Date: Wed, 10 Feb 2016 10:23:02 +0100
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Subject: [Qemu-devel] "trace: split trace_init_file out of
 trace_init_backends" causes hangs on daemonize
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>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org

Paolo,


commit 41fc57e44ed64cd4ab5393d83624afd897dabd4f
    trace: split trace_init_file out of trace_init_backends

causes hangs for libvirt when checking the daemonized process,
if the qemu was build with trace-backend=simple.

Also calling
qemu-system-s390x -machine accel=kvm -S -no-user-config -nodefaults -nographic -M none -qmp unix:/var/lib/libvirt/qemu/capabilities.monitor.sock,server,nowait -pidfile /var/lib/libvirt/qemu/capabilities.pidfile -daemonize

just hangs

without "trace-backend=simple"
things are fine.