1:57 p.m.
On ovirt 4.3.5 we are seeing various problems related to the rbd device staying mapped
after a guest has been live migrated. This causes problems migrating the guest back, as
well as rebooting the guest when it starts back up on the original host. The error
returned is ‘nrbd: unmap failed: (16) Device or resource busy’. I’ve pasted the full vdsm
log below.
As far as I can tell this isn’t happening 100% of the time, and seems to be more prevalent
on busy guests.
(Not sure if I should create a bug for this, so thought I’d start here first)
Thanks,
Dan
Sep 24 19:26:18 mario vdsm[5485]: ERROR FINISH detach_volume error=Managed Volume Helper
failed.: ('Error executing helper: Command
[\'/usr/libexec/vdsm/managedvolume-helper\', \'detach\'] failed with rc=1
out=\'\' err=\'oslo.privsep.daemon: Running privsep helper:
[\\\'sudo\\\', \\\'privsep-helper\\\', \\\'--privsep_context\\\',
\\\'os_brick.privileged.default\\\', \\\'--privsep_sock_path\\\',
\\\'/tmp/tmptQzb10/privsep.sock\\\']\\noslo.privsep.daemon: Spawned new privsep
daemon via rootwrap\\noslo.privsep.daemon: privsep daemon starting\\noslo.privsep.daemon:
privsep process running with uid/gid: 0/0\\noslo.privsep.daemon: privsep process running
with capabilities (eff/prm/inh): CAP_SYS_ADMIN/CAP_SYS_ADMIN/none\\noslo.privsep.daemon:
privsep daemon running as pid 76076\\nTraceback (most recent call last):\\n File
"/usr/libexec/vdsm/managedvolume-helper", line 154, in <module>\\n
sys.exit(main(sys.argv[1:]))\\n File "/usr/libexec/vdsm/managedvolume-helper",
line 77, in main\\n args.command(args)\\n File
"/usr/libexec/vdsm/managedvolume-helper", line 149, in detach\\n
ignore_errors=False)\\n File
"/usr/lib/python2.7/site-packages/vdsm/storage/nos_brick.py", line 121, in
disconnect_volume\\n run_as_root=True)\\n File
"/usr/lib/python2.7/site-packages/os_brick/executor.py", line 52, in _execute\\n
result = self.__execute(*args, **kwargs)\\n File
"/usr/lib/python2.7/site-packages/os_brick/privileged/rootwrap.py", line 169, in
execute\\n return execute_root(*cmd, **kwargs)\\n File
"/usr/lib/python2.7/site-packages/oslo_privsep/priv_context.py", line 241, in
_wrap\\n return self.channel.remote_call(name, args, kwargs)\\n File
"/usr/lib/python2.7/site-packages/oslo_privsep/daemon.py", line 203, in
remote_call\\n raise
exc_type(*result[2])\\noslo_concurrency.processutils.ProcessExecutionError: Unexpected
error while running command.\\nCommand: rbd unmap
/dev/rbd/rbd/volume-0e8c1056-45d6-4740-934d-eb07a9f73160 --conf /tmp/brickrbd_LCKezP --id
ovirt --mon_host 172.16.10.13:3300 --mon_host 172.16.10.14:3300 --mon_host
172.16.10.12:6789\\nExit code: 16\\nStdout: u\\\'\\\'\\nStderr: u\\\'rbd:
sysfs write failed\\\\nrbd: unmap failed: (16) Device or resource
busy\\\\n\\\'\\n\'',)#012Traceback (most recent call last):#012 File
"/usr/lib/python2.7/site-packages/vdsm/common/api.py", line 124, in method#012
ret = func(*args, **kwargs)#012 File
"/usr/lib/python2.7/site-packages/vdsm/API.py", line 1766, in detach_volume#012
return managedvolume.detach_volume(vol_id)#012 File
"/usr/lib/python2.7/site-packages/vdsm/storage/managedvolume.py", line 67, in
wrapper#012 return func(*args, **kwargs)#012 File
"/usr/lib/python2.7/site-packages/vdsm/storage/managedvolume.py", line 135, in
detach_volume#012 run_helper("detach", vol_info)#012 File
"/usr/lib/python2.7/site-packages/vdsm/storage/managedvolume.py", line 179, in
run_helper#012 sub_cmd, cmd_input=cmd_input)#012 File
"/usr/lib/python2.7/site-packages/vdsm/common/supervdsm.py", line 56, in
__call__#012 return callMethod()#012 File
"/usr/lib/python2.7/site-packages/vdsm/common/supervdsm.py", line 54, in
<lambda>#012 **kwargs)#012 File "<string>", line 2, in
managedvolume_run_helper#012 File
"/usr/lib64/python2.7/multiprocessing/managers.py", line 773, in _callmethod#012
raise convert_to_error(kind, result)#012ManagedVolumeHelperFailed: Managed Volume
Helper failed.: ('Error executing helper: Command
[\'/usr/libexec/vdsm/managedvolume-helper\', \'detach\'] failed with rc=1
out=\'\' err=\'oslo.privsep.daemon: Running privsep helper:
[\\\'sudo\\\', \\\'privsep-helper\\\', \\\'--privsep_context\\\',
\\\'os_brick.privileged.default\\\', \\\'--privsep_sock_path\\\',
\\\'/tmp/tmptQzb10/privsep.sock\\\']\\noslo.privsep.daemon: Spawned new privsep
daemon via rootwrap\\noslo.privsep.daemon: privsep daemon starting\\noslo.privsep.daemon:
privsep process running with uid/gid: 0/0\\noslo.privsep.daemon: privsep process running
with capabilities (eff/prm/inh): CAP_SYS_ADMIN/CAP_SYS_ADMIN/none\\noslo.privsep.daemon:
privsep daemon running as pid 76076\\nTraceback (most recent call last):\\n File
"/usr/libexec/vdsm/managedvolume-helper", line 154, in <module>\\n
sys.exit(main(sys.argv[1:]))\\n File "/usr/libexec/vdsm/managedvolume-helper",
line 77, in main\\n args.command(args)\\n File
"/usr/libexec/vdsm/managedvolume-helper", line 149, in detach\\n
ignore_errors=False)\\n File
"/usr/lib/python2.7/site-packages/vdsm/storage/nos_brick.py", line 121, in
disconnect_volume\\n run_as_root=True)\\n File
"/usr/lib/python2.7/site-packages/os_brick/executor.py", line 52, in _execute\\n
result = self.__execute(*args, **kwargs)\\n File
"/usr/lib/python2.7/site-packages/os_brick/privileged/rootwrap.py", line 169, in
execute\\n return execute_root(*cmd, **kwargs)\\n File
"/usr/lib/python2.7/site-packages/oslo_privsep/priv_context.py", line 241, in
_wrap\\n return self.channel.remote_call(name, args, kwargs)\\n File
"/usr/lib/python2.7/site-packages/oslo_privsep/daemon.py", line 203, in
remote_call\\n raise
exc_type(*result[2])\\noslo_concurrency.processutils.ProcessExecutionError: Unexpected
error while running command.\\nCommand: rbd unmap
/dev/rbd/rbd/volume-0e8c1056-45d6-4740-934d-eb07a9f73160 --conf /tmp/brickrbd_LCKezP --id
ovirt --mon_host 172.16.10.13:3300 --mon_host 172.16.10.14:3300 --mon_host
172.16.10.12:6789\\nExit code: 16\\nStdout: u\\\'\\\'\\nStderr: u\\\'rbd:
sysfs write failed\\\\nrbd: unmap failed: (16) Device or resource
busy\\\\n\\\'\\n\'',)
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