Yes, it is reproducible on Jenkins ver. 1.532.2
Moreover, I'd say it takes exactly 5 minutes to "archive artifacts", which is suspicious. Maybe there is some timeout?
I look on the same configuration as Vitaliy has (but 8 configs in total).
Here is how it looks in logs:
==========build #1==========
09:02:55 BUILD SUCCESSFUL
09:02:55 Total time: 14 minutes 34 seconds
09:03:18 Archiving artifacts
09:08:20 Notifying upstream projects of job completion
09:08:20 Join notifier cannot find upstream project: SOAP_cover/Version=410,db=mysql
09:08:20 Finished: SUCCESS
===========================
And few more:
==========build #2==========
09:04:03 Archiving artifacts
09:09:04 Notifying upstream projects of job completion
==========build #3==========
09:24:38 Archiving artifacts
09:29:43 Notifying upstream projects of job completion
==========build #4==========
09:24:53 Archiving artifacts
09:29:53 Notifying upstream projects of job completion
==========build #5==========
09:40:04 Archiving artifacts
09:45:10 Notifying upstream projects of job completion
==========build #6==========
09:42:20 Archiving artifacts
09:47:21 Notifying upstream projects of job completion
==========build #7==========
09:57:13 Archiving artifacts
10:02:15 Notifying upstream projects of job completion
==========build #8==========
09:57:42 Archiving artifacts
10:02:42 Notifying upstream projects of job completion
===========================
Is it reproduced with a recent Jenkins version?