Seems like some F7 machines that sit for awhile do this.
# yum clean all
Loading "installonlyn" plugin
rpmdb: Lock table is out of available locker entries
rpmdb: Unknown locker ID: 912
error: db4 error(22) from db->close: Invalid argument
error: cannot open Packages index using db3 - Cannot allocate memory (12)
error: cannot open Packages database in /var/lib/rpm
Traceback (most recent call last):
File "/usr/bin/yum", line 29, in <module>
yummain.main(sys.argv[1:])
File "/usr/share/yum-cli/yummain.py", line 82, in main
base.getOptionsConfig(args)
File "/usr/share/yum-cli/cli.py", line 146, in getOptionsConfig
errorlevel=opts.errorlevel)
File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 153, in
_getConfig
self._conf = config.readMainConfig(startupconf)
File "/usr/lib/python2.5/site-packages/yum/config.py", line 601, in
readMainConfig
yumvars['releasever'] = _getsysver(startupconf.installroot,
startupconf.distroverpkg)
File "/usr/lib/python2.5/site-packages/yum/config.py", line 664, in
_getsysver
idx = ts.dbMatch('provides', distroverpkg)
TypeError: rpmdb open failed
