Comment 0 for bug 1680197

I'm encountering the following deployment failure (as reported in the web UI's "installation output") on about 1 in 4 deployments on two systems, one running MAAS 2.1.4 and the other MAAS 2.1.5:

curtin: Installation started. (0.1.0~bzr470-0ubuntu1~16.04.1)
Failed to exclusively open path: /dev/sda1
Traceback (most recent call last):
  File "/curtin/curtin/block/__init__.py", line 773, in exclusive_open
    fd = os.open(path, os.O_RDWR | os.O_EXCL)
OSError: [Errno 16] Device or resource busy: '/dev/sda1'
Device holders with exclusive access: []
Device mounts: []
[Errno 16] Device or resource busy: '/dev/sda1'
curtin: Installation failed with exception: Unexpected error while running command.
Command: ['curtin', 'block-meta', 'custom']
Exit code: 3
Reason: -
Stdout: Failed to exclusively open path: /dev/sda1
        Traceback (most recent call last):
          File "/curtin/curtin/block/__init__.py", line 773, in exclusive_open
            fd = os.open(path, os.O_RDWR | os.O_EXCL)
        OSError: [Errno 16] Device or resource busy: '/dev/sda1'
        Device holders with exclusive access: []
        Device mounts: []
        [Errno 16] Device or resource busy: '/dev/sda1'

Stderr: ''

I'm attaching the /var/log/maas directory tree from the 2.1.5 system. Here's the version information from the 2.1.5 installation:

dpkg -s maas | grep Version
Version: 2.1.5+bzr5596-0ubuntu1~16.04.1
root@gil:/# dpkg -l '*maas*'|cat
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============================-==============================-============-==================================================
ii maas 2.1.5+bzr5596-0ubuntu1~16.04.1 all "Metal as a Service" is a physical cloud and IPAM
ii maas-cert-server 0.2.30-0~74~ubuntu16.04.1 all Ubuntu certification support files for MAAS server
ii maas-cli 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS client and command-line interface
un maas-cluster-controller <none> <none> (no description available)
ii maas-common 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS server common files
ii maas-dhcp 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS DHCP server
ii maas-dns 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS DNS server
ii maas-proxy 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS Caching Proxy
ii maas-rack-controller 2.1.5+bzr5596-0ubuntu1~16.04.1 all Rack Controller for MAAS
ii maas-region-api 2.1.5+bzr5596-0ubuntu1~16.04.1 all Region controller API service for MAAS
ii maas-region-controller 2.1.5+bzr5596-0ubuntu1~16.04.1 all Region Controller for MAAS
un maas-region-controller-min <none> <none> (no description available)
un python-django-maas <none> <none> (no description available)
un python-maas-client <none> <none> (no description available)
un python-maas-provisioningserver <none> <none> (no description available)
ii python3-django-maas 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS server Django web framework (Python 3)
ii python3-maas-client 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS python API client (Python 3)
ii python3-maas-provisioningserver 2.1.5+bzr5596-0ubuntu1~16.04.1 all MAAS server provisioning libraries (Python 3)