This bug has been copied from bug #665549 and has been proposed to be backported to 5.6 z-stream (EUS).
Patch posted (identical for 5.6.z and 5.7) http://post-office.corp.redhat.com/archives/rhvirt-patches/2010-December/msg00438.html
Fix built into libvirt-0.8.2-15.el5_6.1
The verification method could see comment13 on 659855 another way also from eric is 1, in a terminal , stop the libvirt service , then run "ulimit -n 1000000" 2, start the libvirtd, # libvirtd 3, in another terminal , start a guest, it will report error: Failed to start domain rhel6.1 error: internal error Process exited while reading console log output: The bug has been verified on libvirt-0.8.2-15.el5_6.1.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-0142.html