Comment 4 for bug 1663364

just before the above "Broken pipe", qom-list failed and errno is 32 which means "Broken pipe".

2017-02-09 18:16:35.362+0000: 16737: info : qemuMonitorIOWrite:528 : QEMU_MONITOR_IO_WRITE: mon=0x7fd01c014000 buf={"execute":"qom-list","arguments":{"path":"//machine/i440fx/pam-pci[15]"},"id":"libvirt-13"}
 len=94 ret=-1 errno=32

Then the corresponding process of the qom-list could be closed.

At the same time, qemuProcessKill happened:

2017-02-09 18:16:35.362+0000: 16737: debug : qemuProcessKill:5203 : vm=0x7fd01000d860 name=instance-00000019 pid=19945 flags=2

According to the log of instance-00000019 (http://logs.openstack.org/59/426459/4/check/gate-tempest-dsvm-neutron-full-ubuntu-xenial/0222b58/logs/libvirt/qemu/instance-00000019.txt.gz),

2017-02-09T18:16:34.314499Z qemu-system-x86_64: terminating on signal 15 from pid 16737

But ps.txt doesn't contain pid 16737, so we cannon know who kills the qemu-system-x86_64.