Description of problem:
While testing the fix for 164630, we were able to get around that race
condition, however that made it possible now to see a deadlock which could occur
when running I/O to a mirror. This was because two processes are both waiting on
the same spinlock.

Version-Release number of selected component (if applicable):
[root@link-02 ~]# lvcreate --version
  LVM version:     2.01.13 (2005-07-13)
  Library version: 1.01.03 (2005-06-13)
  Driver version:  4.4.0

*plus patches to fix 164630*

How reproducible:
everytime