ConcurrentModificationException in DefaultUserProjectHistoryManager

2012-05-18 17:30:45,363 http-8090-1 ERROR      [500ErrorPage.jsp] Exception caught in 500 page null
java.util.ConcurrentModificationException
	at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
	at java.util.AbstractList$Itr.next(AbstractList.java:343)
	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1010)
	at com.atlassian.jira.user.DefaultUserProjectHistoryManager.getProjectHistoryWithPermissionChecks(DefaultUserProjectHistoryManager.java:85)
	at com.atlassian.jira.issue.fields.ProjectSystemField.getCreateHtml(ProjectSystemField.java:85)
	at com.atlassian.jira.issue.fields.rest.FieldHtmlFactoryImpl.createProjectAndIssueTypeFields(FieldHtmlFactoryImpl.java:193)
	at com.atlassian.jira.issue.fields.rest.FieldHtmlFactoryImpl.getCreateFields(FieldHtmlFactoryImpl.java:65)  <+2> (DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$AbstractMultiTenantAwareInvocationHandler.invokeInternal(MultiTenantComponentFactoryImpl.java:181)
	at com.atlassian.multitenant.impl.MultiTenantComponentFactoryImpl$MultiTenantAwareInvocationHandler.invoke(MultiTenantComponentFactoryImpl.java:211)  <+2> (DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.atlassian.plugin.osgi.hostcomponents.impl.DefaultComponentRegistrar$ContextClassLoaderSettingInvocationHandler.invoke(DefaultComponentRegistrar.java:129)  <+2> (DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.atlassian.plugin.osgi.bridge.external.HostComponentFactoryBean$DynamicServiceInvocationHandler.invoke(HostComponentFactoryBean.java:154)
	at com.atlassian.jira.quickedit.action.QuickCreateIssue.doDefault(QuickCreateIssue.java:178)  <+2> (DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at webwork.util.InjectionUtils$DefaultInjectionImpl.invoke(InjectionUtils.java:70)
	at webwork.util.InjectionUtils.invoke(InjectionUtils.java:56)  <+2> (ActionSupport.java:433) (ActionSupport.java:157)
	at com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:82)  <+7> (DefaultInterceptorChain.java:39) (NestedInterceptorChain.java:31) (ChainedInterceptor.java:16) (DefaultInterceptorChain.java:35) (GenericDispatcher.java:205) (GenericDispatcher.java:143) (JiraWebworkActionDispatcher.java:152)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)  <+10> (ApplicationFilterChain.java:290) (ApplicationFilterChain.java:206) (ChainedFilterStepRunner.java:78) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (HeaderSanitisingFilter.java:44) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (IteratingFilterChain.java:46) (DelegatingPluginFilter.java:66)
	at com.atlassian.labs.botkiller.BotKillerFilter.doFilter(BotKillerFilter.java:36)  <+3> (DelegatingPluginFilter.java:74) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:66)
	at com.atlassian.jira.tzdetect.IncludeResourcesFilter.doFilter(IncludeResourcesFilter.java:39)  <+62> (DelegatingPluginFilter.java:74) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:66) (ContextFilter.java:25) (DelegatingPluginFilter.java:74) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (AccessLogFilter.java:103) (AccessLogFilter.java:87) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (XsrfTokenAdditionRequestFilter.java:54) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (SiteMeshFilter.java:129) (SiteMeshFilter.java:77) (SitemeshPageFilter.java:124) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (IteratingFilterChain.java:46) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (SecurityFilter.java:234) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (TrustedApplicationsFilter.java:98) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (BaseLoginFilter.java:157) (JiraLoginFilter.java:70) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (IteratingFilterChain.java:46) (DelegatingPluginFilter.java:66) (OAuthFilter.java:71) (DelegatingPluginFilter.java:74) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (ProfilingFilter.java:99) (JIRAProfilingFilter.java:19) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (AbstractJohnsonFilter.java:71) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (UrlRewriteFilter.java:738) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (GzipFilter.java:80) (GzipFilter.java:51) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (IteratingFilterChain.java:46) (DelegatingPluginFilter.java:66)
	at com.atlassian.jira.dev.backdoor.SlowMotionFilter.doFilter(SlowMotionFilter.java:54)  <+49> (AbstractHttpFilter.java:31) (DelegatingPluginFilter.java:74) (IteratingFilterChain.java:42) (DelegatingPluginFilter.java:66) (JWDSendRedirectFilter.java:25) (DelegatingPluginFilter.java:74) (IteratingFilterChain.java:42) (ServletFilterModuleContainerFilter.java:77) (ServletFilterModuleContainerFilter.java:63) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (ChainedFilterStepRunner.java:78) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (AbstractCachingFilter.java:33) (AbstractHttpFilter.java:31) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (AbstractEncodingFilter.java:41) (AbstractHttpFilter.java:31) (PathMatchingEncodingFilter.java:49) (AbstractHttpFilter.java:31) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (ActiveRequestsFilter.java:346) (ActiveRequestsFilter.java:463) (ActiveRequestsFilter.java:173) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (JiraStartupChecklistFilter.java:75) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (MultiTenantServletFilter.java:91) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (ChainedFilterStepRunner.java:78) (ApplicationFilterChain.java:235) (ApplicationFilterChain.java:206) (StandardWrapperValve.java:233) (StandardContextValve.java:191) (StandardHostValve.java:127) (ErrorReportValve.java:102) (StandardEngineValve.java:109) (AccessLogValve.java:615) (CoyoteAdapter.java:293) (Http11Processor.java:859) (Http11Protocol.java:602) (JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:680)

time (for i in `jot 1000`; do echo $i; done | parallel -j16 'curl -s --cookie JSESSIONID=8D021FE55B908DC179E8664D7DB8E8C3 "http://localhost:8090/jira/secure/QuickCreateIssue!default.jspa?decorator=none" >/dev/null' )