[Xen-users] libvirtd + xl hang on CentOS6

[Martin Zichacek <katzwerke@xxxxxxx>]

Hi,

We are experiencing libvirtd hangs after last May centos6-xen update on 
multiple instances.

Disconnected from xen:/// due to keepalive timeout

xen-4.6.6-12.el6.x86_64

Remedy is to kill -9 libvirtd and start again. Issue can be replicated 
within few domU starts. Usually libvirtd hangs when domU is bringing up 
xen drivers or something around udev, like:

xen_netfront: Initialising Xen virtual ethernet driver

I've been looking into libvirtd strace and debug logs, so far most 
suspicious in libvirtd debug log is this:

libvirtd.log:2018-05-22 08:32:44.760+0000: 25455: debug : 
udevRemoveOneDevice:1289 : Failed to find device to remove that has udev 
name '/sys/devices/vif-24-0/net/vif24.0/queues/tx-7'
libvirtd.log:2018-05-22 08:32:44.761+0000: 25455: debug : 
udevRemoveOneDevice:1289 : Failed to find device to remove that has udev 
name '/sys/devices/vif-24-0/net/vif24.0/queues/tx-6'
libvirtd.log:2018-05-22 08:32:44.761+0000: 25455: debug : 

Is someone out there seeing similar issues? Anyone perhaps interested in 
reviewing full debug log / strace ?


Original post from lists.centos.org:

https://lists.centos.org/pipermail/centos-virt/2018-May/005809.html

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