This bug appeared in EDG build 96: http://hudson.qa.jboss.com/hudson/view/EDG6/view/EDG-QE/job/edg-60-build-edg-from-source/96/artifact/edg-srcbuild.zip
that contains Infinispan 5.1.0.CR3

Test scenario:

1. start 4 nodes (distributed cache)
2. wait 2 min
3. kill node2
4. wait 2 min
5. start node2
6. wait 2 min and end the test

server side logs:
http://hudson.qa.jboss.com/hudson/view/EDG6/view/EDG-QE/job/edg-60-experiments-mlinhard-perflab/8/artifact/report/serverlogs.zip
client side logs:
http://hudson.qa.jboss.com/hudson/view/EDG6/view/EDG-QE/job/edg-60-experiments-mlinhard-perflab/8/console-perf05/consoleText
http://hudson.qa.jboss.com/hudson/view/EDG6/view/EDG-QE/job/edg-60-experiments-mlinhard-perflab/8/console-perf07/consoleText

after crashing of the node2, there were no other succesfull requests, most of the requests ended with this error:

ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (HotRodServerWorker-1-43) ISPN000136: Execution error: java.lang.IllegalStateException: Trying to release state transfer shared lock without acquiring it first

before showing the error on the client side, the requests had been blocked around 1,5min