Comment 3 for bug 1197648

I added some code to cinder/cinder/volume/manager.py and reproduce it:

diff --git a/cinder/volume/manager.py b/cinder/volume/manager.py
index d8e23c2..6331165 100644
--- a/cinder/volume/manager.py
+++ b/cinder/volume/manager.py
@@ -270,12 +270,16 @@ class VolumeManager(manager.SchedulerDependentManager):
                                       volume_ref['id'],
                                       {'status': 'error'})
                 return
- except Exception:
+ except Exception as ex:
                 # restore source volume status before reschedule
                 if sourcevol_ref is not None:
                     self.db.volume_update(context, sourcevol_ref['id'],
                                           {'status': sourcevol_ref['status']})
+ print "==="*20
+ print ex
+ print "==="*20
                 exc_info = sys.exc_info()
+ print exc_info
                 # try to re-schedule volume:
                 self._reschedule_or_reraise(context, volume_id, exc_info,
                                             snapshot_id, image_id,

error log:

============================================================
Unexpected error while running command.
Command: sudo cinder-rootwrap /etc/cinder/rootwrap.conf dd if=/dev/zero of=/dev/mapper/stack--volumes-clone--snap--12b110c4--01f2--4221--a06f--3883cb3a3d0a count=1024 bs=1M conv=fdatasync
Exit code: 1
Stdout: ''
Stderr: "/bin/dd: fdatasync failed for `/dev/mapper/stack--volumes-clone--snap--12b110c4--01f2--4221--a06f--3883cb3a3d0a': Input/output error\n1024+0 records in\n1024+0 records out\n1073741824 bytes (1.1 GB) copied, 466.395 s, 2.3 MB/s\n"
============================================================
(None, None, None)
2013-07-04 21:07:23.759 ERROR cinder.volume.manager [req-781185b1-59ef-4d32-a3c5-1ff4c4f36769 d18561d834914ffba68fbb7a0c869ecf 827e49101c9b48e8998360d1e6abb346] volume volume-8419dd91-957b-4759-9ce4-78b08e5c0bd4: create failed
2013-07-04 21:07:23.760 ERROR cinder.openstack.common.rpc.amqp [req-781185b1-59ef-4d32-a3c5-1ff4c4f36769 d18561d834914ffba68fbb7a0c869ecf 827e49101c9b48e8998360d1e6abb346] Exception during message handling
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp Traceback (most recent call last):
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp File "/opt/stack/cinder/cinder/openstack/common/rpc/amqp.py", line 433, in _process_data
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp **args)
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp File "/opt/stack/cinder/cinder/openstack/common/rpc/dispatcher.py", line 148, in dispatch
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp return getattr(proxyobj, method)(ctxt, **kwargs)
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp File "/opt/stack/cinder/cinder/volume/manager.py", line 311, in create_volume
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp "create.end")
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp File "/usr/lib/python2.7/contextlib.py", line 24, in __exit__
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp self.gen.next()
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp File "/opt/stack/cinder/cinder/volume/manager.py", line 287, in create_volume
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp allow_reschedule)
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp File "/opt/stack/cinder/cinder/volume/manager.py", line 370, in _reschedule_or_reraise
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp raise exc_info[0], exc_info[1], exc_info[2]
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp TypeError: exceptions must be old-style classes or derived from BaseException, not NoneType
2013-07-04 21:07:23.760 TRACE cinder.openstack.common.rpc.amqp
2013-07-04 21:08:06.381 DEBUG cinder.openstack.common.periodic_task [-] Running periodic task VolumeManager._publish_service_capabilities from (pid=5155) run_periodic_tasks /opt/stack/cinder/cinder/openstack/common/periodic_task.py:176