We're hitting an assert whenever we try to create an HVM instance under Xen via libvirtd.

System is running on Gentoo, package information as follows:

app-emulation/xen-4.5.0 USE="api debug flask hvm pam pygrub python qemu screen"

app-emulation/xen-tools-4.5.0 USE="api debug flask hvm pam pygrub python qemu screen"

app-emulation/libvirt-1.2.11-r2:0/1.2.11 USE="caps libvirtd lvm macvtap nls qemu udev vepa virtualbox xen"

The following commands are run in parallel:

vmmachine ~ # libvirtd --listen

2015-01-22 16:33:13.596+0000: 2620: info : libvirt version: 1.2.11

2015-01-22 16:33:13.596+0000: 2620: error : udevGetDMIData:1607 : Failed to get udev device for syspath '/sys/devices/virtual/dmi/id' or '/sys/class/dmi/id'

libvirtd: libxl_fork.c:350: sigchld_installhandler_core: Assertion `((void)"application must negotiate with libxl about SIGCHLD", !(sigchld_saved_action.sa_flags & 4) && (sigchld_saved_action.__sigaction_handler.sa_handler == ((__sighandler_t) 0) || sigchld_saved_action.__sigaction_handler.sa_handler == ((__sighandler_t) 1)))' failed.

Aborted

vmmachine ~ # VIRSH_DEBUG=0 virsh create xml

create: file(optdata): xml

libvirt: XML-RPC error : End of file while reading data: Input/output error

error: Failed to create domain from xml

error: End of file while reading data: Input/output error

libvirt: Domain Config error : Requested operation is not valid: A different callback was requested