While trying to rebase https://gerrit.wikimedia.org/r/#/c/406500/ an "500 Internal server error" popped-up every time I tried. I removed the conflcting file from the Gerrit UI and tried to rebase again with the same result. I'm now doing a manual rebase but maybe this should be investigated. Thanks.
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[2018-01-28 18:14:43,711] [HTTP-18210] ERROR com.google.gerrit.httpd.restapi.RestApiServlet : Error in POST /r/changes/406500/revisions/3b34bcccf483992e05c302e1f1ba14a61401fbfb/rebase com.google.gerrit.server.git.UpdateException: org.eclipse.jgit.errors.MissingObjectException: Missing blob 20ef3cf73632e2711677dbfd0e440de5ce619f3e at com.google.gerrit.server.git.BatchUpdate.executeUpdateRepo(BatchUpdate.java:673) at com.google.gerrit.server.git.BatchUpdate.execute(BatchUpdate.java:400) at com.google.gerrit.server.git.BatchUpdate.execute(BatchUpdate.java:649) at com.google.gerrit.server.git.BatchUpdate.execute(BatchUpdate.java:644) at com.google.gerrit.server.change.Rebase.apply(Rebase.java:112) at com.google.gerrit.server.change.Rebase.apply(Rebase.java:55) at com.google.gerrit.httpd.restapi.RestApiServlet.service(RestApiServlet.java:341) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at com.google.inject.servlet.ServletDefinition.doServiceImpl(ServletDefinition.java:286) at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:276) at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:181) at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:85) at com.google.gerrit.httpd.GetUserFilter.doFilter(GetUserFilter.java:82) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.RequireSslFilter.doFilter(RequireSslFilter.java:77) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gwtexpui.server.CacheControlFilter.doFilter(CacheControlFilter.java:73) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.RunAsFilter.doFilter(RunAsFilter.java:122) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.RequestMetricsFilter.doFilter(RequestMetricsFilter.java:60) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.AllRequestFilter$FilterProxy$1.doFilter(AllRequestFilter.java:136) at com.google.gerrit.httpd.AllRequestFilter$FilterProxy.doFilter(AllRequestFilter.java:138) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.gerrit.httpd.RequestContextFilter.doFilter(RequestContextFilter.java:75) at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82) at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:120) at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:135) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:221) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:499) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:311) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:544) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:748) Caused by: org.eclipse.jgit.errors.MissingObjectException: Missing blob 20ef3cf73632e2711677dbfd0e440de5ce619f3e at org.eclipse.jgit.internal.storage.file.WindowCursor.open(WindowCursor.java:159) at org.eclipse.jgit.lib.ObjectReader$Filter.open(ObjectReader.java:502) at org.eclipse.jgit.merge.ResolveMerger.getRawText(ResolveMerger.java:850) at org.eclipse.jgit.merge.ResolveMerger.contentMerge(ResolveMerger.java:666) at org.eclipse.jgit.merge.ResolveMerger.processEntry(ResolveMerger.java:645) at org.eclipse.jgit.merge.ResolveMerger.mergeTreeWalk(ResolveMerger.java:1070) at org.eclipse.jgit.merge.ResolveMerger.mergeTrees(ResolveMerger.java:1020) at org.eclipse.jgit.merge.ResolveMerger.mergeImpl(ResolveMerger.java:304) at org.eclipse.jgit.merge.Merger.merge(Merger.java:212) at org.eclipse.jgit.merge.Merger.merge(Merger.java:165) at org.eclipse.jgit.merge.ThreeWayMerger.merge(ThreeWayMerger.java:114) at com.google.gerrit.server.change.RebaseChangeOp.rebaseCommit(RebaseChangeOp.java:237) at com.google.gerrit.server.change.RebaseChangeOp.updateRepo(RebaseChangeOp.java:146) at com.google.gerrit.server.git.BatchUpdate.executeUpdateRepo(BatchUpdate.java:657) ... 45 more