[JENKINS-76058] [REGRESSION] - "keyInfoData array empty" error when connecting to EC2 agents after updating sshd plugin to version 2.16.0-167.va_269f38cc024

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#1,973 opened on Sep 2, 2025 10 comments 0 reactions 0 assignees View on GitHub

component:ec2-plugin component:mina-sshd-api-plugin imported-jira-issue priority:blocker regression resolution:unresolved

Dominant language: Java
Stars: 292
Forks: 709
Avg merge: 3d 16h
Merged PRs (30d): 4

Description

v2.15.0-161.vb_200831a_c15b_ works perfectly fine. Updating to 2.16.0-167.va_269f38cc024 results in the following error when trying to establish connection to new agent:

"Unable to check the server key Exception: java.lang.IllegalArgumentException: keyInfoData array empty"

Other information:

Host Key Verification Strategy set to off

Full stack trace

java.lang.IllegalArgumentException: keyInfoData array empty

at PluginClassLoader for bouncycastle-api//org.bouncycastle.crypto.util.PublicKeyFactory.createKey(Unknown Source)

at PluginClassLoader for ec2//hudson.plugins.ec2.ssh.EC2SSHLauncher$ServerKeyVerifierImpl.verifyServerKey(EC2SSHLauncher.java:401)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.client.session.AbstractClientSession.checkKeys(AbstractClientSession.java:620)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.handleKexMessage(AbstractSession.java:776)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:631)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.lambda$handleMessage$0(AbstractSession.java:555)

at PluginClassLoader for mina-sshd-api-common//org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:68)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:554)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1738)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:515)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:76)

at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.mina.MinaService.messageReceived(MinaService.java:163)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:1015)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:49)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:1128)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:122)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:643)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:539)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor.access$1200(AbstractPollingIoProcessor.java:68)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1224)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1213)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:683)

at PluginClassLoader for mina-sshd-api-core//org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)

at java.base/java.lang.Thread.run(Thread.java:1583)

---
Originally reported by patdunne, imported from: [REGRESSION] - "keyInfoData array empty" error when connecting to EC2 agents after updating sshd plugin to version 2.16.0-167.va_269f38cc024

assignee: allan_burdajewicz
status: In Review
priority: Blocker
component(s): ec2-plugin, mina-sshd-api-plugin
label(s): regression
resolution: Unresolved
votes: 0
watchers: 7
imported: 2025-12-06

Raw content of original issue

v2.15.0-161.vb_200831a_c15b_ works perfectly fine. Updating to 2.16.0-167.va_269f38cc024 results in the following error when trying to establish connection to new agent:

"Unable to check the server key Exception: java.lang.IllegalArgumentException: keyInfoData array empty"

Other information:

Host Key Verification Strategy set to off

Full stack trace

java.lang.IllegalArgumentException: keyInfoData array empty
at PluginClassLoader for bouncycastle-api//org.bouncycastle.crypto.util.PublicKeyFactory.createKey(Unknown Source)
at PluginClassLoader for ec2//hudson.plugins.ec2.ssh.EC2SSHLauncher$ServerKeyVerifierImpl.verifyServerKey(EC2SSHLauncher.java:401)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.client.session.AbstractClientSession.checkKeys(AbstractClientSession.java:620)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.handleKexMessage(AbstractSession.java:776)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.doHandleMessage(AbstractSession.java:631)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.lambda$handleMessage$0(AbstractSession.java:555)
at PluginClassLoader for mina-sshd-api-common//org.apache.sshd.common.util.threads.ThreadUtils.runAsInternal(ThreadUtils.java:68)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.handleMessage(AbstractSession.java:554)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.decode(AbstractSession.java:1738)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSession.messageReceived(AbstractSession.java:515)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.common.session.helpers.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:76)
at PluginClassLoader for mina-sshd-api-core//org.apache.sshd.mina.MinaService.messageReceived(MinaService.java:163)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:1015)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1300(DefaultIoFilterChain.java:49)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:1128)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:122)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:650)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:643)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:539)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor.access$1200(AbstractPollingIoProcessor.java:68)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1224)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.process(AbstractPollingIoProcessor.java:1213)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:683)
at PluginClassLoader for mina-sshd-api-core//org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)

environment

```
Jenkins - 2.516.2

EC2 Plugin - 2018.vc13c882e22db_

MinaSSHD - 2.16.0-167.va_269f38cc024
```

Contributor guide

Open the contributing guide

Research direction

Start at hudson.plugins.ec2.ssh.EC2SSHLauncher$ServerKeyVerifierImpl.verifyServerKey, reported at EC2SSHLauncher.java:401, and compare behavior between the listed EC2 and MinaSSHD plugin versions. Reproduce the connection attempt with host key verification disabled and verify that new EC2 agents connect without the "keyInfoData array empty" exception.

Written by the indexing model from the issue text.

Assessment

Tech stack: aws, java
Domain: cloud
Issue type: Bug
Difficulty: 4/5
Estimated time: 3-5 days
Activity status: Stale
Clarity: Mostly clear
Newbie friendliness: 35/100

[JENKINS-76058] [REGRESSION] - "keyInfoData array empty" error when connecting to EC2 agents after updating sshd plugin to version 2.16.0-167.va_269f38cc024

Description

Contributor guide

Research direction

Assessment

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