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From: Christian Borntraeger <borntraeger@de.ibm.com>
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Date: Wed, 10 Feb 2016 10:29:32 +0100
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Subject: Re: [Qemu-devel] "trace: split trace_init_file out of
 trace_init_backends" causes hangs on daemonize
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To: Paolo Bonzini <pbonzini@redhat.com>
Cc: qemu-devel@nongnu.org

On 02/10/2016 10:23 AM, Christian Borntraeger wrote:
> 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.
> 
> 

Just found a fix on the list.