Currently when I have a multiple jobs running..

Instance of Main JOB 1
Subjob a (build number 1)
subjob b
subjob c

Instance of Main JOB 2
subjob a (build number 2)
subjob b
subjob c

Now if subjob a failed on the first Main Job, then it would attempt to retry that subjob a and get a DEAD executor, because it fails to overwrite $Jenkins_Home\Workspace\Job\MainJob\builds\2 because its currently in USE by Main Job 2 subjob a

Should be a straightforward fix, have the retry portion of the multijob plugin reread the nextbuildnumber file and consequently assign the build a number that is not currently in use.

I believe it currently just increments the previous failed job number by 1