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I do not have a way to reproduce that problem but this happened twice on our gerrit production server. JGit do an infinite loop in MyersDiff. The only info I have is the stack trace: "InteractiveMergeabilityChecks-1" prio=10 tid=0x00007fbb300d7000 nid=0xe392 runnable [0x00007fbc469e7000] java.lang.Thread.State: RUNNABLE at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$BackwardEditPaths.snake(MyersDiff.java:501) at org.eclipse.jgit.diff.MyersDiff$MiddleEdit$EditPaths.calculate(MyersDiff.java:414) at org.eclipse.jgit.diff.MyersDiff$MiddleEdit.calculate(MyersDiff.java:260) at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:188) at org.eclipse.jgit.diff.MyersDiff.calculateEdits(MyersDiff.java:165) at org.eclipse.jgit.diff.MyersDiff.<init>(MyersDiff.java:148) at org.eclipse.jgit.diff.MyersDiff.<init>(MyersDiff.java:112) at org.eclipse.jgit.diff.MyersDiff$1.diffNonCommon(MyersDiff.java:119) at org.eclipse.jgit.diff.HistogramDiff$State.diffReplace(HistogramDiff.java:172) at org.eclipse.jgit.diff.HistogramDiff.diffNonCommon(HistogramDiff.java:133) at org.eclipse.jgit.diff.LowLevelDiffAlgorithm.diffNonCommon(LowLevelDiffAlgorithm.java:59) at org.eclipse.jgit.diff.DiffAlgorithm.diff(DiffAlgorithm.java:123) at org.eclipse.jgit.diff.DiffFormatter.diff(DiffFormatter.java:958) at org.eclipse.jgit.diff.DiffFormatter.createFormatResult(DiffFormatter.java:936) at org.eclipse.jgit.diff.DiffFormatter.toFileHeader(DiffFormatter.java:889) at com.google.gerrit.server.patch.PatchListLoader.readPatchList(PatchListLoader.java:161) at com.google.gerrit.server.patch.PatchListLoader.load(PatchListLoader.java:87) at com.google.gerrit.server.patch.PatchListLoader.load(PatchListLoader.java:70) at com.google.gerrit.server.cache.h2.H2CacheImpl$Loader.load(H2CacheImpl.java:249) at com.google.gerrit.server.cache.h2.H2CacheImpl$Loader.load(H2CacheImpl.java:229) at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524) at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317) at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280) - locked <0x00007fc39784c4c8> (a com.google.common.cache.LocalCache$StrongAccessEntry) at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195) at com.google.common.cache.LocalCache.get(LocalCache.java:3934) at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938) at com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4821) at com.google.gerrit.server.cache.h2.H2CacheImpl.get(H2CacheImpl.java:111) at com.google.gerrit.server.patch.PatchListCacheImpl.get(PatchListCacheImpl.java:81) at com.google.gerrit.server.patch.PatchListCacheImpl.get(PatchListCacheImpl.java:99) at com.google.gerrit.server.query.change.ChangeData.currentFilePaths(ChangeData.java:278) at com.google.gerrit.server.index.ChangeField.getFileParts(ChangeField.java:195) at com.google.gerrit.server.index.ChangeField$12.get(ChangeField.java:210) at com.google.gerrit.server.index.ChangeField$12.get(ChangeField.java:206) at com.google.gerrit.server.index.Schema$1.apply(Schema.java:103) at com.google.gerrit.server.index.Schema$1.apply(Schema.java:98) at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48) at com.google.common.collect.Iterators$7.computeNext(Iterators.java:646) at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) at com.google.gerrit.lucene.LuceneChangeIndex.toDocument(LuceneChangeIndex.java:483) at com.google.gerrit.lucene.LuceneChangeIndex.replace(LuceneChangeIndex.java:296) at com.google.gerrit.server.index.ChangeIndexer.index(ChangeIndexer.java:131) at com.google.gerrit.server.index.ChangeIndexer.index(ChangeIndexer.java:142) at com.google.gerrit.server.change.Mergeable.refresh(Mergeable.java:196) at com.google.gerrit.server.change.Mergeable.apply(Mergeable.java:113) at com.google.gerrit.server.change.MergeabilityChecker$Task.call(MergeabilityChecker.java:341) at com.google.gerrit.server.change.MergeabilityChecker$Task.call(MergeabilityChecker.java:294) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:178) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:292) at com.google.gerrit.server.git.WorkQueue$Task.run(WorkQueue.java:364) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:724)
