Bulk Pull Request re-scope fails with process time-out

2016-05-03 10:57:56,180 ERROR [pull-request-rescoping:thread-1]  c.a.s.i.c.HazelcastBucketedExecutor Attempt 1 of 1 at processing bucket 'pull-request-rescoping@4' for executor 'pull-request-rescoping' failed: 
com.atlassian.bitbucket.ServerException: An error occurred while executing an external process: process timed out
	at com.atlassian.bitbucket.scm.git.command.GitCommandExitHandler.evaluateThrowable(GitCommandExitHandler.java:115) ~[na:na]
	at com.atlassian.bitbucket.scm.git.command.GitCommandExitHandler.onError(GitCommandExitHandler.java:160) ~[na:na]
	at com.atlassian.bitbucket.scm.DefaultCommandExitHandler.onExit(DefaultCommandExitHandler.java:31) ~[bitbucket-spi-4.5.2.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand.callExitHandler(BaseCommand.java:138) ~[bitbucket-spi-4.5.2.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.internalGet(BaseCommand.java:252) ~[bitbucket-spi-4.5.2.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.get(BaseCommand.java:221) ~[bitbucket-spi-4.5.2.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand.call(BaseCommand.java:75) ~[bitbucket-spi-4.5.2.jar:na]
	at com.atlassian.stash.internal.scm.git.command.BulkRescopeCommand.call(BulkRescopeCommand.java:99) ~[na:na]
	at com.atlassian.stash.internal.scm.git.command.BulkRescopeCommand.call(BulkRescopeCommand.java:40) ~[na:na]
	at com.atlassian.stash.internal.scm.PluginScmService.bulkRescope(PluginScmService.java:173) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.pull.rescope.DefaultPullRequestRescopeService.determineRescopes(DefaultPullRequestRescopeService.java:172) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.pull.rescope.DefaultPullRequestRescopeService.rescopeInternal(DefaultPullRequestRescopeService.java:305) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.pull.rescope.DefaultPullRequestRescopeService.lambda$rescope$0(DefaultPullRequestRescopeService.java:112) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.pull.rescope.DefaultPullRequestRescopeService$$Lambda$138/1462439340.perform(Unknown Source) ~[na:na]
	at com.atlassian.stash.internal.user.DefaultEscalatedSecurityContext.call(DefaultEscalatedSecurityContext.java:51) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.pull.rescope.DefaultPullRequestRescopeService.rescope(DefaultPullRequestRescopeService.java:111) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.pull.rescope.PullRequestRescopeBucketProcessor.process(PullRequestRescopeBucketProcessor.java:131) ~[bitbucket-service-impl-4.5.2.jar:na]
	at com.atlassian.stash.internal.concurrent.HazelcastBucketedExecutor$BucketProcessingBootstrapper.run(HazelcastBucketedExecutor.java:125) ~[bitbucket-service-impl-4.5.2.jar:na]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_40]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_40]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_40]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_40]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]
	... 34 frames trimmed
Caused by: com.atlassian.utils.process.ProcessTimeoutException: process timed out
	at com.atlassian.utils.process.ExternalProcessImpl.wrapUpProcess(ExternalProcessImpl.java:675) ~[atlassian-processutils-1.7.5.jar:na]
	at com.atlassian.utils.process.ExternalProcessImpl.finish(ExternalProcessImpl.java:161) ~[atlassian-processutils-1.7.5.jar:na]
	at com.atlassian.bitbucket.scm.BaseCommand$CommandFuture.get(BaseCommand.java:219) ~[bitbucket-spi-4.5.2.jar:na]
	... 19 common frames omitted