Bug#764711: jenkins: Fails on "Unable to read /var/lib/jenkins/config.xml"

[Olivier Berger]

Source: jenkins
Version: 1.565.3-1
Severity: important

Dear Maintainer,

After a recent upgrade, I can no longer access Jenkins, which displays :
Error

hudson.util.HudsonFailedToLoad: org.jvnet.hudson.reactor.ReactorException: java.io.IOException: Unable to read /var/lib/jenkins/config.xml
	at hudson.WebAppMain$3.run(WebAppMain.java:234)
Caused by: org.jvnet.hudson.reactor.ReactorException: java.io.IOException: Unable to read /var/lib/jenkins/config.xml
	at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:269)
	at jenkins.InitReactorRunner.run(InitReactorRunner.java:44)
	at jenkins.model.Jenkins.executeReactor(Jenkins.java:912)
	at jenkins.model.Jenkins.<init>(Jenkins.java:811)
	at hudson.model.Hudson.<init>(Hudson.java:82)
	at hudson.model.Hudson.<init>(Hudson.java:78)
	at hudson.WebAppMain$3.run(WebAppMain.java:222)
Caused by: java.io.IOException: Unable to read /var/lib/jenkins/config.xml
	at hudson.XmlFile.unmarshal(XmlFile.java:165)
	at jenkins.model.Jenkins$17.run(Jenkins.java:2561)
	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
	at jenkins.model.Jenkins$7.runTask(Jenkins.java:901)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:745)
Caused by: com.thoughtworks.xstream.converters.ConversionException: hudson.security.GlobalMatrixAuthorizationStrategy : hudson.security.GlobalMatrixAuthorizationStrategy
---- Debugging information ----
message             : hudson.security.GlobalMatrixAuthorizationStrategy
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : hudson.security.GlobalMatrixAuthorizationStrategy
class               : hudson.model.Hudson
required-type       : hudson.model.Hudson
converter-type      : hudson.util.RobustReflectionConverter
path                : /hudson/authorizationStrategy
line number         : 10
version             : not available
-------------------------------
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1189)
	at hudson.util.XStream2.unmarshal(XStream2.java:112)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
	at hudson.XmlFile.unmarshal(XmlFile.java:163)
	... 9 more

Thanks in advance.

Best regards,

-- System Information:
Debian Release: jessie/sid
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing-proposed-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16-2-amd64 (SMP w/8 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash