Tests fail while another instance simultaneously running tests :

14:38:49,113 [main] ERROR LdapTestServer : Failed to start Apache DS:
javax.naming.NamingException: Could not initialize RecordManager [Root exception is java.io.FileNotFoundException: /tmp/apacheds-work/system/master.db (Permission denied)]
        at org.apache.directory.server.core.partition.impl.btree.jdbm.JdbmDirectoryPartition.init(JdbmDirectoryPartition.java:144)
        at org.apache.directory.server.core.partition.DefaultDirectoryPartitionNexus.initializeSystemPartition(DefaultDirectoryPartitionNexus.java:261)
        at org.apache.directory.server.core.partition.DefaultDirectoryPartitionNexus.init(DefaultDirectoryPartitionNexus.java:188)
        at org.apache.directory.server.core.DefaultDirectoryService.initialize(DefaultDirectoryService.java:849)
        at org.apache.directory.server.core.DefaultDirectoryService.startup(DefaultDirectoryService.java:226)
        at org.apache.directory.server.core.jndi.AbstractContextFactory.getInitialContext(AbstractContextFactory.java:103)
        at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667)
        at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)
        at javax.naming.InitialContext.init(InitialContext.java:223)
        at javax.naming.InitialContext.<init>(InitialContext.java:197)
        at javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:82)
        at org.nuxeo.ecm.directory.ldap.LdapTestServer.startLdapServer(LdapTestServer.java:230)
        at org.nuxeo.ecm.directory.ldap.LdapTestServer.getContext(LdapTestServer.java:175)
        at org.nuxeo.ecm.directory.ldap.LDAPDirectory.getSession(LDAPDirectory.java:219)
        at org.nuxeo.ecm.directory.ldap.LDAPDirectoryTestCase.setUp(LDAPDirectoryTestCase.java:68)
        at org.nuxeo.ecm.directory.ldap.TestCachedLDAPSession.setUp(TestCachedLDAPSession.java:16)