Created attachment 753532 [details]
logs

Description of problem:

I ran a vm on the hsm and blocked connectivity from the hsm to the storage domain right when we finish the createVolume task.

when engine tries to clean cloneImageStructure we fail with  'java.lang.ArrayIndexOutOfBoundsException: -1'

after the host became non-operational I restored the connectivity to the storage from the host and after a few minutes AutoRecovery tries to activate the host. 

the host is stuck in unassigned until I restarted ovirt-engine service, even host reboot does not release it. 

Version-Release number of selected component (if applicable):

sf17.1
vdsm-4.10.2-21.0.el6ev.x86_64

How reproducible:

100%

Steps to Reproduce:
1. in iscsi storage with multiple domains and export domain, create a vm from template and run it on the hsm host
2. when FINISH, CreateSnapshotVDSCommand is logged in the engine log block connectivity to the storage domain from the hsm host using iptables 
3. when host becomes non-operational restore the connectivity to the storage

Actual results:

engine fails to clear task cloneImageStructure with 'java.lang.ArrayIndexOutOfBoundsException: -1'
when we restore the connectivity to the storage from the hsm and AutoRecovery tries to activate the host, host is stuck in unassigned until we restart engine and clear the task. 


Expected results:

host should not be stuck in unassigned because of ArrayIndexOutOfBoundsException

Additional info: logs