[libvirt] question about locking in qemuDomainObjBeginJobInternal()

[Chris Friesen]

Hi,

I'm hitting a scenario (on libvirt 1.2.12, so yeah it's a bit old) where I'm 
attempting to create two domains at the same time, and they both end up erroring 
out with "cannot acquire state change lock":


2017-08-14T12:57:00.000 79674: warning : qemuDomainObjBeginJobInternal:1380 : 
Cannot start job (modify, none) for domain instance-00000001; current job is 
(modify, none) owned by (79673, 0)
2017-08-14T12:57:00.000 79674: error : qemuDomainObjBeginJobInternal:1385 : 
Timed out during operation: cannot acquire state change lock
2017-08-14T12:57:01.000 79675: warning : qemuDomainObjBeginJobInternal:1380 : 
Cannot start job (modify, none) for domain instance-00000002; current job is 
(modify, none) owned by (79677, 0)
2017-08-14T12:57:01.000 79675: error : qemuDomainObjBeginJobInternal:1385 : 
Timed out during operation: cannot acquire state change lock

Given that the lock appears to be per-domain, I assume this means that something 
is trying to issue multiple operations in parallel to each domain?

Chris