somtimes libvirtd crashed when fail to start a guest, need help to debug

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Dear list,

I met a problem when test with the latest libvirt (build from current master branch), i found sometimes libvirtd crashed when guest fail to start.

the reproduce way is very easy, but hard to meet:

# cat /root/shdo2.sh
#!/bin/sh

while :

do
   virsh start rhel7.0-rhel

done

# sh /root/shdo2.sh

...

error: Failed to start domain rhel7.0-rhel
error: internal error: process exited while connecting to monitor: 2015-12-09T06:58:37.785695Z qemu-kvm: -chardev socket,id=charchannel1,path=/var/lib/libvirt/qemu1/rhel7.0-rhel.agent,server,nowait: Failed to bind socket to /var/lib/libvirt/qemu1/rhel7.0-rhel.agent: No such file or directory

error: Failed to start domain rhel7.0-rhel
error: internal error: process exited while connecting to monitor: 2015-12-09T06:58:42.035103Z qemu-kvm: -chardev socket,id=charchannel1,path=/var/lib/libvirt/qemu1/rhel7.0-rhel.agent,server,nowait: Failed to bind socket to /var/lib/libvirt/qemu1/rhel7.0-rhel.agent: No such file or directory

error: Disconnected from qemu:///system due to I/O error
error: Failed to start domain rhel7.0-rhel
error: End of file while reading data: Input/output error

error: One or more references were leaked after disconnect from the hypervisor
error: failed to connect to the hypervisor
error: no valid connection
error: Failed to connect socket to '/var/run/libvirt/libvirt-sock': Connection refused


and here is the bt full output:

http://pastebin.com/sCYHByvP

and here is the valgrind output:

http://pastebin.com/0VXrYTKT

I cannot found what happened, also i am not familiar with virtlogd. could someone please help to debug this ?

Thanks,
Luyao

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