[libvirt] "Unable to read QEMU help output: Interrupted system call" doing virDomainRestore() on current master

[Charles Duffy]

Charles Duffy wrote:
> $ virsh restore ramsave
> error: Failed to restore domain from ramsave
> error: Unable to read QEMU help output: Interrupted system call
> 
> This happens immediately (no delay) and only on restore; "virsh start" 
> behaves as usual.

To be explicit (as I wasn't earlier) -- this is 
b167672c748bd7d16cd5f450096232266583b851 built on RHEL5 with a great 
many things disabled:

   $ ./configure \
	--host=x86_64-redhat-linux-gnu \
	--build=x86_64-redhat-linux-gnu \
	--target=x86_64-redhat-linux \
	--program-prefix= \
	--prefix=/usr \
	--exec-prefix=/usr \
	--bindir=/usr/bin \
	--sbindir=/usr/sbin \
	--sysconfdir=/etc \
	--datadir=/usr/share \
	--includedir=/usr/include \
	--libdir=/usr/lib64 \
	--libexecdir=/usr/libexec \
	--localstatedir=/var \
	--sharedstatedir=/usr/com \
	--mandir=/usr/share/man \
	--infodir=/usr/share/info \
	--without-xen \
	--without-openvz \
	--without-lxc \
	--without-vbox \
	--without-polkit \
	--without-uml \
	--without-one \
	--without-phyp \
	--without-esx \
	--with-rhel5-api \
	--without-storage-fs \
	--without-storage-lvm \
	--without-storage-iscsi \
	--without-storage-disk \
	--without-capng \
	--without-netcf \
	--with-qemu-user=root \
	--with-qemu-group=root \
	--with-init-script=redhat \
	--with-remote-pid-file=/var/run/libvirtd.pid