I am copying a large artifact from a previous step and am getting the stack trace below. I downgraded the copyartifact plugin to 1.19 - which does not have this problem.

step1 - checkout a git repo into directory "pro", then archive "pro/**" and trigger buildstep2, passing a parmeter
step2 - checkout another git repo and then copy artifact from step1 from "upstream build that triggered this job"

Commencing build of Revision 04a5687ef9869a96a488b5be559f5a4a77fec3ba (origin/HEAD)
Checking out Revision 04a5687ef9869a96a488b5be559f5a4a77fec3ba (origin/HEAD)
Cleaning workspace
ERROR: Failed to copy artifacts from branch-pro-step01-checkout-pro with filter: pro/**
hudson.util.IOException2: Failed to copy /var/lib/jenkins/jobs/branch-pro-step01-checkout-pro/builds/2012-02-08_16-31-54/archive/pro/.git/objects/pack/pack-b6bcfbde9cf85594588dc36e89676d73b43a3de0.idx to /var/voltdb/jenkins/workspace/branch-pro-step02-checkout-voltdb-and-build/pro/.git/objects/pack/pack-b6bcfbde9cf85594588dc36e89676d73b43a3de0.idx
at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyOne(FingerprintingCopyMethod.java:90)
at hudson.plugins.copyartifact.FingerprintingCopyMethod.copyAll(FingerprintingCopyMethod.java:63)
at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:231)
at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:203)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:700)
at hudson.model.Build$RunnerImpl.build(Build.java:178)
at hudson.model.Build$RunnerImpl.doRun(Build.java:139)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:470)
at hudson.model.Run.run(Run.java:1409)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)
Caused by: java.io.FileNotFoundException: /var/voltdb/jenkins/workspace/branch-pro-step02-checkout-voltdb-and-build/pro/.git/objects/pack/pack-b6bcfbde9cf85594588dc36e89676d73b43a3de0.idx (Permission denied)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at hudson.FilePath$26.call(FilePath.java:1401)
at hudson.FilePath$26.call(FilePath.java:1397)
at hudson.remoting.UserRequest.perform(UserRequest.java:118)
at hudson.remoting.UserRequest.perform(UserRequest.java:48)
at hudson.remoting.Request$2.run(Request.java:287)
at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Build step 'Copy artifacts from another project' marked build as failure
Archiving artifacts
Recording test results
Finished: FAILURE