The CheckRun in the PR bot is currently failing to process https://github.com/openjdk/jol/pull/24. This is the stacktrace:

java.lang.RuntimeException: Exception during jcheck
at org.openjdk.skara.bots.pr/org.openjdk.skara.bots.pr.CheckRun.checkStatus(CheckRun.java:1157)
at org.openjdk.skara.bots.pr/org.openjdk.skara.bots.pr.CheckRun.execute(CheckRun.java:98)
at org.openjdk.skara.bots.pr/org.openjdk.skara.bots.pr.CheckWorkItem.run(CheckWorkItem.java:353)
at org.openjdk.skara.bot/org.openjdk.skara.bot.BotRunner$RunnableWorkItem.runMeasured(BotRunner.java:190)
at org.openjdk.skara.bot/org.openjdk.skara.bot.BotRunner$RunnableWorkItem.run(BotRunner.java:146)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:539)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:304)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.io.IOException: Unexpected exit code
'git merge-base 1b6d9fbaf4401281c2449b9c47778d5a34842fcd 385500e3bc17b8c0b3f3fd44ba31fddd16600a14' exited with status: 1
[stdout]
[stderr]
at org.openjdk.skara.vcs/org.openjdk.skara.vcs.git.GitRepository.await(GitRepository.java:116)
at org.openjdk.skara.vcs/org.openjdk.skara.vcs.git.GitRepository.mergeBase(GitRepository.java:924)
at org.openjdk.skara.forge/org.openjdk.skara.forge.PullRequestUtils.containsForeignMerge(PullRequestUtils.java:222)
at org.openjdk.skara.bots.pr/org.openjdk.skara.bots.pr.CheckRun.checkStatus(CheckRun.java:1113)
... 10 more

I believe this is happening because there are commits in the PR branch that do not have a merge-base with the master branch.