I am experiencing the same problem.

Environment: Solaris 10 fully patched, running on VMWare 1.0.5
build-80187.
mysql from blastwave:

common-1.4.5-SunOS5.8-i386-CSW.pkg
isaexec-0.1-all-CSW.pkg
mysql5-5.0.51,REV=2008.01.20-SunOS5.8-i386-CSW.pkg
mysql5client-5.0.51,REV=2007.12.19-SunOS5.8-i386-CSW.pkg
mysql5rt-5.0.51,REV=2008.01.20-SunOS5.8-i386-CSW.pkg
ncurses-5.5,REV=2006.02.10-SunOS5.8-i386-CSW.pkg
openssl_rt-0.9.8,REV=2007.12.26_rev=g-SunOS5.8-i386-CSW.pkg
pkg_get-3.8.4-SunOS5.8-all-CSW.pkg
pm_dbdmysql-4.006,REV=2008.01.19-SunOS5.8-i386-CSW.pkg
pm_dbi-1.601,REV=2008.01.24-SunOS5.8-i386-CSW.pkg
pm_netdaemon-0.43,REV=2008.03.02-SunOS5.8-all-CSW.pkg
pm_plrpc-0.2018-SunOS5.8-all-CSW.pkg
readline-5.0,REV=2005.06.07-SunOS5.8-i386-CSW.pkg
zlib-1.2.3,REV=2007.05.12-SunOS5.8-i386-CSW.pkg

setup steps:

[install above packages using pkgadd]

cp /opt/csw/mysql5/share/mysql/my-large.cnf /opt/csw/mysql5/
my.cnf
cd /opt/csw/mysql5
./bin/mysql_install_db
chown -R mysql:mysql ./var

svcadm disable svc:/network/cswmysql5:default
svcadm enable svc:/network/cswmysql5:default
svcs -xv cswmysql5

/opt/csw/mysql5/bin/mysqladmin -u root password 'password'
/opt/csw/mysql5/bin/mysqladmin -u root -h swash password
'password'

I'm wondering if this has to do with SMF shutting down the server that
the test script starts ? Any help would be appreciated. Thanks.