I've reproduced the issue

[root@fuel dump]# fuel --fuel-version
api: '1.0'
astute_sha: f7cda2171b0b677dfaeb59693d980a2d3ee4c3e0
auth_required: true
build_id: 2015-01-23_08-15-08
build_number: '43'
feature_groups:
- mirantis
fuellib_sha: 9aa913096fb93ea4847ee14bfaf33597326886f3
fuelmain_sha: 1ee1766a51bdb5bed75d5c2efdcaaa318118e439
nailgun_sha: 5c4d298bd9a702aafea486a9ea7a013cb64190ff
ostf_sha: 3b57985d4d2155510894a1f6d03b478b201f7780
production: docker
release: 6.0.1
release_versions:
  2014.2-6.0.1:
    VERSION:
      api: '1.0'
      astute_sha: f7cda2171b0b677dfaeb59693d980a2d3ee4c3e0
      build_id: 2015-01-23_08-15-08
      build_number: '43'
      feature_groups:
      - mirantis
      fuellib_sha: 9aa913096fb93ea4847ee14bfaf33597326886f3
      fuelmain_sha: 1ee1766a51bdb5bed75d5c2efdcaaa318118e439
      nailgun_sha: 5c4d298bd9a702aafea486a9ea7a013cb64190ff
      ostf_sha: 3b57985d4d2155510894a1f6d03b478b201f7780
      production: docker
      release: 6.0.1

Baremetal+Centos+HA+Neutron-gre+LVM+Debug+6.0.1_43
controllers: 3 
computes: 97

I have runed cinder rally tests on 10 env http://mos-scale.vm.mirantis.net:8080/view/ENV-10/job/10_env_run_rally_custom/5/console

On a compute in cinder-all log I have found:
on a compute node:
<159>Jan 23 09:54:06 node-10 cinder-volume Error reported running lvremove: CMD: sudo cinder-rootwrap /etc/cinder/rootwrap.conf lvremove --config activation
{ retry_deactivation = 1}
f cinder/_snapshot-658240e8-4ab7-4ce3-9724-e1901d4a9e40, RESPONSE: Unable to deactivate open cinder_snapshot-658240e84ab74ce39724-e1901d4a9e40-cow (253:19)
Failed to activate _snapshot-658240e8-4ab7-4ce3-9724-e1901d4a9e40.
libdevmapper exiting with 1 device(s) still suspended.

In messages log file:
<6>Jan 23 10:15:46 node-10 kernel: lvremove D 0000000000000004 0 20053 20052 0x00000080
<4>Jan 23 10:15:46 node-10 kernel: ffff8807fe5efa18 0000000000000086 ffff8807fe5ef978 ffffffff8126b3e4
<4>Jan 23 10:15:46 node-10 kernel: ffff88080c002980 ffff88086d025500 ffff8807fe5ef9e8 ffffffffa000461c
<4>Jan 23 10:15:46 node-10 kernel: ffff8807fe5ef9d8 ffff8807fe5ef9d8 ffff88086d84b058 ffff8807fe5effd8
<4>Jan 23 10:15:46 node-10 kernel: Call Trace:
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8126b3e4>] ? blk_unplug+0x34/0x70
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffffa000461c>] ? dm_table_unplug_all+0x5c/0x100 [dm_mod]
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff810aaa21>] ? ktime_get_ts+0xb1/0xf0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff81529643>] io_schedule+0x73/0xc0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811ce7dd>] __blockdev_direct_IO_newtrunc+0xb7d/0x1270
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811ca140>] ? blkdev_get_block+0x0/0x20
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8127a10d>] ? get_disk+0x7d/0xf0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811cef47>] __blockdev_direct_IO+0x77/0xe0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811ca140>] ? blkdev_get_block+0x0/0x20
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811cb1c7>] blkdev_direct_IO+0x57/0x60
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811ca140>] ? blkdev_get_block+0x0/0x20
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8112616b>] generic_file_aio_read+0x6bb/0x700
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811cbd10>] ? blkdev_get+0x10/0x20
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811cbd20>] ? blkdev_open+0x0/0xc0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8118b17f>] ? __dentry_open+0x23f/0x360
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811ca581>] blkdev_aio_read+0x51/0x80
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8118de9a>] do_sync_read+0xfa/0x140
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8109eb00>] ? autoremove_wake_function+0x0/0x40
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811ca4dc>] ? block_ioctl+0x3c/0x40
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811a3772>] ? vfs_ioctl+0x22/0xa0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff811a3914>] ? do_vfs_ioctl+0x84/0x580
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8122d466>] ? security_file_permission+0x16/0x20
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8118e855>] vfs_read+0xb5/0x1a0
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8118e991>] sys_read+0x51/0x90
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff810e5a7e>] ? __audit_syscall_exit+0x25e/0x290
<4>Jan 23 10:15:46 node-10 kernel: [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b