Cannot see user admin page in embedded H2 database while large user directory is syncing

2016-06-22 10:48:51,805 ERROR [http-nio-7990-exec-6] admin @1XWNN0Dx648x199x0 uhvc4l 0:0:0:0:0:0:0:1 "GET /admin/users HTTP/1.1" c.a.s.i.w.HandlerExceptionResolverImpl A database error has occurred.
com.atlassian.bitbucket.DataStoreException: A database error has occurred.
        at com.atlassian.stash.internal.aop.ExceptionRewriteAdvice.afterThrowing(ExceptionRewriteAdvice.java:41) ~[bitbucket-platform-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.web.admin.UserAndGroupListController.listUsers(UserAndGroupListController.java:41) ~[classes/:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1464655676000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1464655676000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1464655676000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1464655676000.jar:na]
        at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) [applinks-plugin-5.2.2_1464655676000.jar:na]
        at com.atlassian.stash.internal.spring.security.StashAuthenticationFilter.doFilter(StashAuthenticationFilter.java:88) [classes/:na]
        at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doInsideSpringSecurityChain(BeforeLoginPluginAuthenticationFilter.java:109) [classes/:na]
        at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doFilter(BeforeLoginPluginAuthenticationFilter.java:75) [classes/:na]
        at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:94) [atlassian-trusted-apps-core-4.2.0.jar:na]
        at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:67) [atlassian-oauth-service-provider-plugin-2.0.3_1443759955000.jar:na]
        at com.atlassian.security.auth.trustedapps.filter.TrustedApplicationsFilter.doFilter(TrustedApplicationsFilter.java:94) [atlassian-trusted-apps-core-4.2.0.jar:na]
        at com.atlassian.oauth.serviceprovider.internal.servlet.OAuthFilter.doFilter(OAuthFilter.java:67) [atlassian-oauth-service-provider-plugin-2.0.3_1443759955000.jar:na]
        at com.atlassian.core.filters.ServletContextThreadLocalFilter.doFilter(ServletContextThreadLocalFilter.java:21) [atlassian-core-4.6.19.jar:na]
        at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:31) [atlassian-core-4.6.19.jar:na]
        at com.atlassian.plugin.connect.plugin.auth.user.ThreeLeggedAuthFilter.doFilter(ThreeLeggedAuthFilter.java:109) [atlassian-connect-plugin-1.1.86-bitbucket-04.jar:na]
        at com.atlassian.jwt.internal.servlet.JwtAuthFilter.doFilter(JwtAuthFilter.java:32) [jwt-plugin-1.5.11-0002_1461023611000.jar:na]
        at com.atlassian.analytics.client.filter.DefaultAnalyticsFilter.doFilter(DefaultAnalyticsFilter.java:38) [analytics-client-5.2.7_1464655676000.jar:na]
        at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:39) [analytics-client-5.2.7_1464655676000.jar:na]
        at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doBeforeBeforeLoginFilters(BeforeLoginPluginAuthenticationFilter.java:87) [classes/:na]
        at com.atlassian.stash.internal.web.auth.BeforeLoginPluginAuthenticationFilter.doFilter(BeforeLoginPluginAuthenticationFilter.java:73) [classes/:na]
        at com.atlassian.stash.internal.request.DefaultRequestManager.doAsRequest(DefaultRequestManager.java:86) ~[bitbucket-service-impl-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.hazelcast.ConfigurableWebFilter.doFilter(ConfigurableWebFilter.java:38) ~[classes/:na]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) ~[na:1.8.0_60]
        at java.lang.Thread.run(Thread.java:745) ~[na:1.8.0_60]
        ... 265 frames trimmed
Caused by: org.hibernate.PessimisticLockException: could not execute statement
        at org.hibernate.dialect.H2Dialect$2.convert(H2Dialect.java:342) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:211) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3127) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:3581) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:104) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:465) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:351) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:350) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.event.internal.DefaultAutoFlushEventListener.onAutoFlush(DefaultAutoFlushEventListener.java:67) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.internal.SessionImpl.autoFlushIfRequired(SessionImpl.java:1227) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1293) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.internal.QueryImpl.list(QueryImpl.java:103) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at org.hibernate.internal.AbstractQueryImpl.uniqueResult(AbstractQueryImpl.java:966) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        at com.atlassian.stash.internal.user.HibernateStashUserDao.findByName(HibernateStashUserDao.java:172) ~[bitbucket-dao-impl-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.user.HibernateStashUserDao.createFor(HibernateStashUserDao.java:331) ~[bitbucket-dao-impl-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.user.DefaultUserHelper.newStashUser(DefaultUserHelper.java:60) ~[bitbucket-service-impl-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.user.DefaultUserHelper.lambda$transformOrCreate$136(DefaultUserHelper.java:53) ~[bitbucket-service-impl-4.7.0-SNAPSHOT.jar:na]
        at com.google.common.collect.Iterators$8.transform(Iterators.java:799) ~[guava-18.0.jar:na]
        at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48) ~[guava-18.0.jar:na]
        at com.google.common.collect.ImmutableCollection$Builder.addAll(ImmutableCollection.java:301) ~[guava-18.0.jar:na]
        at com.google.common.collect.ImmutableList$Builder.addAll(ImmutableList.java:691) ~[guava-18.0.jar:na]
        at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:275) ~[guava-18.0.jar:na]
        at com.google.common.collect.ImmutableList.copyOf(ImmutableList.java:226) ~[guava-18.0.jar:na]
        at com.atlassian.bitbucket.util.PageImpl.transform(PageImpl.java:93) ~[bitbucket-api-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.bitbucket.util.PageImpl.transform(PageImpl.java:11) ~[bitbucket-api-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.user.DefaultUserHelper.transformOrCreate(DefaultUserHelper.java:50) ~[bitbucket-service-impl-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.user.DefaultUserAdminService.transformOrCreateUsers(DefaultUserAdminService.java:700) ~[bitbucket-service-impl-4.7.0-SNAPSHOT.jar:na]
        at com.atlassian.stash.internal.user.DefaultUserAdminService.findUsersByName(DefaultUserAdminService.java:402) ~[bitbucket-service-impl-4.7.0-SNAPSHOT.jar:na]
        ... 26 common frames omitted
Caused by: org.h2.jdbc.JdbcSQLException: Timeout trying to lock table ; SQL statement:
insert into sta_normal_user (deleted_timestamp, locale, slug, time_zone, name, user_id) values (?, ?, ?, ?, ?, ?) [50200-176]
        at org.h2.message.DbException.getJdbcSQLException(DbException.java:344) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.message.DbException.get(DbException.java:167) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.command.Command.filterConcurrentUpdate(Command.java:301) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.command.Command.executeUpdate(Command.java:256) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.jdbc.JdbcPreparedStatement.executeUpdateInternal(JdbcPreparedStatement.java:158) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.jdbc.JdbcPreparedStatement.executeUpdate(JdbcPreparedStatement.java:144) ~[h2-1.3.176.jar:1.3.176]
        at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeUpdate(ProxyPreparedStatement.java:61) ~[HikariCP-2.4.5.jar:na]
        at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeUpdate(HikariProxyPreparedStatement.java) ~[HikariCP-2.4.5.jar:na]
        at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:208) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final]
        ... 52 common frames omitted
Caused by: org.h2.jdbc.JdbcSQLException: Concurrent update in table "UQ_NORMAL_USER_NAME_INDEX_3": another transaction has updated or deleted the same row [90131-176]
        at org.h2.message.DbException.getJdbcSQLException(DbException.java:344) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.message.DbException.get(DbException.java:178) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.message.DbException.get(DbException.java:154) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.table.RegularTable.addRow(RegularTable.java:145) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.command.dml.Insert.insertRows(Insert.java:157) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.command.dml.Insert.update(Insert.java:115) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.command.CommandContainer.update(CommandContainer.java:79) ~[h2-1.3.176.jar:1.3.176]
        at org.h2.command.Command.executeUpdate(Command.java:254) ~[h2-1.3.176.jar:1.3.176]
        ... 57 common frames omitted