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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Tue, 1 Mar 2016 12:50:18 +0100
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Subject: Re: [Qemu-devel] [PATCH] log: Redirect stderr to logfile if
	deamonized
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To: Gerd Hoffmann <kraxel@redhat.com>, Dimitris Aragiorgis <dimara@arrikto.com>
Cc: qemu-devel@nongnu.org



On 01/03/2016 12:15, Gerd Hoffmann wrote:
> On Do, 2016-02-18 at 13:38 +0200, Dimitris Aragiorgis wrote:
>> In case of daemonize, use the logfile passed with the -D option in
>> order to redirect stderr to it instead of /dev/null.
>>
>> Also remove some unused code in log.h.
> 
> Patch breaks interaction with libvirt.  libvirt hangs on startup, while
> probing qemu capabilities.  qemu runs in probing mode (command line is
> "/home/kraxel/projects/qemu/build-default/x86_64-softmmu/qemu-system-x86_64 -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" according to "systemctl status libvirtd -l"), apparently both qemu and libvirt wait for each other.

Patch sent, as a workaround use "./configure --enable-trace-backend=nop".

Paolo