when starting an ssh agent on the slave the following stack trace occurs. Downgrading to 1.3 resolves the issue.

Started by user Mark
Building remotely on EC2-Jenkins-Slave (i-5a34613e) in workspace /var/jenkins/workspace/Mirror_Global_Commerce
[ssh-agent] Using credentials jenkinsadmin
[ssh-agent] Looking for ssh-agent implementation...
[ssh-agent] Java/JNR ssh-agent
[ssh-agent] FATAL: Could not find a suitable ssh-agent provider
[ssh-agent] Diagnostic report
[ssh-agent] * Java/JNR ssh-agent
[ssh-agent] java.io.IOException: Remote call on EC2-Jenkins-Slave (i-5a34613e) failed
[ssh-agent] at hudson.remoting.Channel.call(Channel.java:723)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.jna.JNRRemoteAgentFactory.start(JNRRemoteAgentFactory.java:61)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper$SSHAgentEnvironment.<init>(SSHAgentBuildWrapper.java:211)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper.createSSHAgentEnvironment(SSHAgentBuildWrapper.java:123)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper.preCheckout(SSHAgentBuildWrapper.java:93)
[ssh-agent] at jenkins.scm.SCMCheckoutStrategy.preCheckout(SCMCheckoutStrategy.java:78)
[ssh-agent] at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:556)
[ssh-agent] at hudson.model.Run.execute(Run.java:1665)
[ssh-agent] at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
[ssh-agent] at hudson.model.ResourceController.execute(ResourceController.java:88)
[ssh-agent] at hudson.model.Executor.run(Executor.java:230)
[ssh-agent] Caused by: java.lang.UnsatisfiedLinkError: /lib/libc.so.6: wrong ELF class: ELFCLASS32
[ssh-agent] at jnr.ffi.provider.jffi.NativeLibrary.loadNativeLibraries(NativeLibrary.java:87)
[ssh-agent] at jnr.ffi.provider.jffi.NativeLibrary.getNativeLibraries(NativeLibrary.java:70)
[ssh-agent] at jnr.ffi.provider.jffi.NativeLibrary.getSymbolAddress(NativeLibrary.java:49)
[ssh-agent] at jnr.ffi.provider.jffi.NativeLibrary.findSymbolAddress(NativeLibrary.java:59)
[ssh-agent] at jnr.ffi.provider.jffi.AsmLibraryLoader.generateInterfaceImpl(AsmLibraryLoader.java:125)
[ssh-agent] at jnr.ffi.provider.jffi.AsmLibraryLoader.loadLibrary(AsmLibraryLoader.java:63)
[ssh-agent] at jnr.ffi.provider.jffi.NativeLibraryLoader.loadLibrary(NativeLibraryLoader.java:43)
[ssh-agent] at jnr.ffi.LibraryLoader.load(LibraryLoader.java:228)
[ssh-agent] at jnr.ffi.Library.loadLibrary(Library.java:123)
[ssh-agent] at jnr.ffi.Library.loadLibrary(Library.java:80)
[ssh-agent] at jnr.unixsocket.Native$LibC.<clinit>(Native.java:40)
[ssh-agent] at jnr.unixsocket.Native.libsocket(Native.java:60)
[ssh-agent] at jnr.unixsocket.Native.socket(Native.java:68)
[ssh-agent] at jnr.unixsocket.UnixServerSocketChannel.<init>(UnixServerSocketChannel.java:38)
[ssh-agent] at jnr.unixsocket.UnixServerSocket.<init>(UnixServerSocket.java:29)
[ssh-agent] at jnr.unixsocket.UnixServerSocketChannel.open(UnixServerSocketChannel.java:48)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.jna.AgentServer.start(AgentServer.java:67)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.jna.JNRRemoteAgent.<init>(JNRRemoteAgent.java:64)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.jna.JNRRemoteAgentStarter.call(JNRRemoteAgentStarter.java:54)
[ssh-agent] at com.cloudbees.jenkins.plugins.sshagent.jna.JNRRemoteAgentStarter.call(JNRRemoteAgentStarter.java:35)
[ssh-agent] at hudson.remoting.UserRequest.perform(UserRequest.java:118)
[ssh-agent] at hudson.remoting.UserRequest.perform(UserRequest.java:48)
[ssh-agent] at hudson.remoting.Request$2.run(Request.java:326)
[ssh-agent] at hudson.remoting.InterceptingExecutorService$1.call(InterceptingExecutorService.java:72)
[ssh-agent] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
[ssh-agent] at java.util.concurrent.FutureTask.run(FutureTask.java:166)
[ssh-agent] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
[ssh-agent] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
[ssh-agent] at java.lang.Thread.run(Thread.java:679)
FATAL: [ssh-agent] Unable to start agent
hudson.util.IOException2: [ssh-agent] Unable to start agent
at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper.createSSHAgentEnvironment(SSHAgentBuildWrapper.java:130)
at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper.preCheckout(SSHAgentBuildWrapper.java:93)
at jenkins.scm.SCMCheckoutStrategy.preCheckout(SCMCheckoutStrategy.java:78)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:556)
at hudson.model.Run.execute(Run.java:1665)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:230)
Caused by: java.lang.RuntimeException: [ssh-agent] Could not find a suitable ssh-agent provider.
at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper$SSHAgentEnvironment.<init>(SSHAgentBuildWrapper.java:229)
at com.cloudbees.jenkins.plugins.sshagent.SSHAgentBuildWrapper.createSSHAgentEnvironment(SSHAgentBuildWrapper.java:123)
... 7 more