[libvirt-users] [libvirt-1.3.2]'Disconnected from qemu:///session due to I/O error'

[Predrag Ivanovic]

On Sat, 05 Mar 2016 11:16:21 +0100
Michal Privoznik wrote:

>>This looks like a dying session daemon to me. You can check if my
>suspicion is right by running the session daemon by hand. From a console
>run:
>
>$ /usr/sbin/libvirtd
>
>Usually, connecting to qemu:///session does the same, except it appends
>'--timeout=30' to tell the session daemon to die after 30 seconds of
>inactivity. And here's the problem - there should be a keepalive running
>preventing daemon from dying.
>

libvirt-1.3.1
root at deus:~/bin#> ps aux | grep libvirtd
pedja     3122  0.0  0.0 1027672 2376 ?        Sl   Mar03   0:03 /usr/sbin/libvirtd --timeout=30
root     19814  0.0  0.1 1298708 5500 ?        Sl   Mar03   0:00 /usr/sbin/libvirtd -d -v -f /etc/libvirt/libvirtd.conf -p /var/run/libvirt/libvirtd.pid
-------
libvirt-git-92ec2e5
root at deus:~/bin#> ps aux | grep libvirtd
root     13553  0.0  0.4 972948 16552 ?        Sl   16:02   0:00 /usr/sbin/libvirtd -d -v -f /etc/libvirt/libvirtd.conf -p /var/run/libvirt/libvirtd.pid
pedja    13723  0.0  0.4 965248 18508 ?        Sl   16:03   0:00 /usr/sbin/libvirtd --timeout=30
-------
libvirt-1.3.2
root at deus:~/bin#> ps aux | grep libvirtd
root     16778  0.3  0.3 383212 15700 ?        Sl   17:10   0:00 /usr/sbin/libvirtd -d -v -f /etc/libvirt/libvirtd.conf -p /var/run/libvirt/libvirtd.pid
pedja    16975  3.2  0.4 637588 17964 ?        Sl   17:11   0:00 /usr/sbin/libvirtd --timeout=30

Only the session daemon from libvirt-1.3.2 dies randomly, 1.3.1 and libvirt-git-92ec2e5 are stable (no disconnects).
I managed to hook gdb to session daemon above after a few tries, and  gdb log ('thread apply all bt') 
and virsh.log are attached.
 
I'll be running libvirt from git master for now, but I have both it and 1.3.2 built with debug symbols, if you need more information.

Pedja

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