[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1735663

Title:
  privsep.daemon takes 9 seconds during taking volume attaching
  operation

Status in OpenStack Compute (nova):
  Expired

Bug description:
  When we did volume attaching operation (cinder/ceph as backend),
  cinder took 5 seconds to finish its job, but nova took another 9s for
  running privsep helper before calling into cinder, cause the total
  amount time for attaching operation becomes ~15 seconds which seems
  too long for us.

  Here is the log

  2017-12-01 03:46:23.028 7 INFO nova.compute.manager 
[req-0e8c7f34-c0bd-4911-9022-a8747ebc03b8 a942d72fde65421f9d1897f1c23e6c34 
289dbde7038f454396fde8b136414701 - default default] [instance: 
04b47cd2-600b-40c1-9c3b-43e71898d1b9] Attaching volume 
15ed8c33-cc00-4445-8d02-43807abc85b8 to /dev/vdb
  2017-12-01 03:46:27.264 7 INFO oslo.privsep.daemon 
[req-0e8c7f34-c0bd-4911-9022-a8747ebc03b8 a942d72fde65421f9d1897f1c23e6c34 
289dbde7038f454396fde8b136414701 - default default] Running privsep helper: 
['sudo', 'nova-rootwrap', '/etc/nova/rootwrap.conf', 'privsep-helper', 
'--config-file', '/usr/share/nova/nova-dist.conf', '--config-file', 
'/etc/nova/nova.conf', '--privsep_context', 'os_brick.privileged.default', 
'--privsep_sock_path', '/tmp/tmpZkKVsQ/privsep.sock']
  2017-12-01 03:46:28.160 7 INFO oslo.privsep.daemon 
[req-0e8c7f34-c0bd-4911-9022-a8747ebc03b8 a942d72fde65421f9d1897f1c23e6c34 
289dbde7038f454396fde8b136414701 - default default] Spawned new privsep daemon 
via rootwrap
  2017-12-01 03:46:28.106 1345 INFO oslo.privsep.daemon [-] privsep daemon 
starting
  2017-12-01 03:46:28.109 1345 INFO oslo.privsep.daemon [-] privsep process 
running with uid/gid: 0/0
  2017-12-01 03:46:28.111 1345 INFO oslo.privsep.daemon [-] privsep process 
running with capabilities (eff/prm/inh): CAP_SYS_ADMIN/CAP_SYS_ADMIN/none
  2017-12-01 03:46:28.112 1345 INFO oslo.privsep.daemon [-] privsep daemon 
running as pid 1345
  2017-12-01 03:46:32.119 7 INFO nova.compute.resource_tracker 
[req-3b3a701f-d6a6-4511-acf9-35877317a2df - - - - -] Final resource view: 
name=host-192-168-11-5 phys_ram=65500MB used_ram=768MB phys_disk=822GB 
used_disk=10GB total_vcpus=40 used_vcpus=1 pci_stats=[]

  
  Any idea here?

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