Created attachment 1116780 [details]
libvirtd log and guest XML

Description of problem:
Set unix channel mode to "connect" and disk image source file pointing to a non-existing path in guest XML, then start guest, libvirtd will crash.


Version-Release number of selected component (if applicable):
libvirt:
# git describe
v1.3.1-11-g020135d

qemu:
# git describe
v2.5.0-640-g3db34bf



How reproducible:
100%

Steps to Reproduce:
1.Prepare guest XML as below:
# virsh dumpxml rhel7.2-1
...
    <disk type='file' device='disk'>
      <driver name='qemu' type='raw' cache='none'/>
      <source file='/90121/fjin/r7raw.raw'/>

...
    <channel type='unix'>
      <source mode='connect'/>
      <target type='virtio' name='org.qemu.guest_agent.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
...

# ls /90121/fjin/r7raw.raw
ls: cannot access /90121/fjin/r7raw.raw: No such file or directory

2. Start guest, libvirtd crashes:
# virsh start rhel7.2-1
error: Disconnected from qemu:///system due to I/O error
error: Failed to start domain rhel7.2-1
error: End of file while reading data: Input/output error

error: One or more references were leaked after disconnect from the hypervisor

3.Set unix channel source mode to bind, libvirtd doesn't crash:
# virsh dumpxml rhel7.2-1
...
    <channel type='unix'>
      <source mode='bind'/>
      <target type='virtio' name='org.qemu.guest_agent.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
...

# virsh start rhel7.2-1
error: Failed to start domain rhel7.2-1
error: Cannot access storage file '/90121/fjin/r7raw.raw' (as uid:107, gid:107): No such file or directory



Actual results:
Libvirtd crashes.

Expected results:
Libvirtd doesn't crash.

Additional info:
1. I test with libvirt-1.2.17-13.el7_2.2.x86_64, set guest xml as below, libvirtd doesn't crash:
# virsh dumpxml rhel7.2
...
    <channel type='unix'>
      <source mode='connect' path='/var/lib/libvirt/qemu/channel/target/domain-rhel7.2/org.qemu.guest_agent.0'/>
      <target type='virtio' name='org.qemu.guest_agent.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='2'/>
    </channel>
...

# virsh start rhel7.2
error: Failed to start domain rhel7.2
error: Cannot access storage file '/var/lib/libvirt/images/rraw.raw' (as uid:107, gid:107): No such file or directory