Generally it can help to say which plugin you did update when you say that
caused a problem :).

By chance, looking at the stacktrace, did you update the matrix project
plugin? If so maybe try to downgrade it to the version before?

Cheers
And it goes down hill from here.

The first error in the log on disk is:

Feb 28, 2015 11:50:28 AM jenkins.InitReactorRunner$1 onAttained
INFO: Prepared all plugins
Feb 28, 2015 11:50:29 AM org.jvnet.hudson.annotation_indexer.Index$2$1 fetch
WARNING: Failed to load hudson.plugins.git.GitSCM
java.lang.NoClassDefFoundError: hudson/matrix/MatrixBuild
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2615)
        at java.lang.Class.getDeclaredMethods(Class.java:1860)
        at
org.jvnet.hudson.annotation_indexer.Index$2$1.fetch(Index.java:102)
        at
org.jvnet.hudson.annotation_indexer.Index$2$1.hasNext(Index.java:72)
        at
org.jvnet.hudson.annotation_indexer.SubtypeIterator.fetch(SubtypeIterator.java:18)
        at
org.jvnet.hudson.annotation_indexer.SubtypeIterator.hasNext(SubtypeIterator.java:28)
        at
hudson.init.TaskMethodFinder.discoverTasks(TaskMethodFinder.java:56)
        at
hudson.init.InitializerFinder.discoverTasks(InitializerFinder.java:33)
        at hudson.PluginManager$2$1$3.run(PluginManager.java:400)
        at
org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
        at jenkins.model.Jenkins$7.runTask(Jenkins.java:903)
        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: java.lang.ClassNotFoundException: hudson.matrix.MatrixBuild
        at
jenkins.util.AntClassLoader.findClassInComponents(AntClassLoader.java:1375)
        at jenkins.util.AntClassLoader.findClass(AntClassLoader.java:1325)
        at jenkins.util.AntClassLoader.loadClass(AntClassLoader.java:1078)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 18 more


The web page says:


  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:237)
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:914)
        at jenkins.model.Jenkins.<init>(Jenkins.java:813)
        at hudson.model.Hudson.<init>(Hudson.java:83)
        at hudson.model.Hudson.<init>(Hudson.java:79)
        at hudson.WebAppMain$3.run(WebAppMain.java:225)
Caused by: java.io.IOException: Unable to read /var/lib/jenkins/config.xml
        at hudson.XmlFile.unmarshal(XmlFile.java:165)
        at jenkins.model.Jenkins$16.run(Jenkins.java:2642)
        at
org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
        at jenkins.model.Jenkins$7.runTask(Jenkins.java:903)
        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.ProjectMatrixAuthorizationStrategy :
hudson.security.ProjectMatrixAuthorizationStrategy
---- Debugging information ----
message             : hudson.security.ProjectMatrixAuthorizationStrategy
cause-exception     :
com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : hudson.security.ProjectMatrixAuthorizationStrategy
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:113)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
        at hudson.XmlFile.unmarshal(XmlFile.java:163)
        ... 9 more
Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException:
hudson.security.ProjectMatrixAuthorizationStrategy
        at
com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:79)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:280)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:43)
        at
com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)
        at
com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:48)
        at
hudson.util.RobustReflectionConverter.determineType(RobustReflectionConverter.java:417)
        at
hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:285)
        at
hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:228)
        at
com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
        ... 18 more


--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
-                                                               -
- Jason Pyeron                      PD Inc. http://www.pdinc.us -
- Principal Consultant              10 West 24th Street #100    -
- +1 (443) 269-1555 x333            Baltimore, Maryland 21218   -
-                                                               -
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
This message is copyright PD Inc, subject to license 20080407P00.

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