NOTICE: LockRelease: locktable lookup failed, no lock

Since the new parallel regression tests I've always had a few
lock NOTICE messages like the following.

In my latest run (from a CVS update today) I seem to have
a significantly higher level of failures and NOTICE messages.

I'm not sure where to look for the problem.

Platform Is Solaris 7 SPARC.

Here's just a sample from the 1st few parallel tests:-

bash-2.03$ ./checkresults | more
======   boolean   ======
0a1,2
> NOTICE:  LockRelease: locktable lookup failed, no lock
> NOTICE:  LockRelease: locktable lookup failed, no lock
======   varchar   ======
0a1,2
> NOTICE:  LockRelease: locktable lookup failed, no lock
> NOTICE:  LockRelease: xid table corrupted
======   int2   ======
0a1,4
> NOTICE:  LockRelease: locktable lookup failed, no lock
> NOTICE:  LockRelease: locktable lookup failed, no lock
> NOTICE:  LockRelease: locktable lookup failed, no lock
> NOTICE:  LockRelease: locktable lookup failed, no lock
10c14