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Bug
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Resolution: Fixed
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Blocker
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None
Hi,
Since several days I have at least once Jenkins UI that doesn't reply. Background jobs are ok but we have a white screen or nothing from the web UI. We have many (maven) jobs and a lot of plugins. Master have several executors. I can give you many more details if required.
I created a thread dump : https://gist.github.com/aheritier/8593910
You can see "Handling GET" threads blocked with something like :
java.lang.Thread.State: BLOCKED (on object monitor) at hudson.maven.MavenModuleSetBuild.getResult(MavenModuleSetBuild.java:211) - waiting to lock <0x00000006ef034588> (a java.lang.Object) at hudson.plugins.projectstats.NumBuildsStats.compute(NumBuildsStats.java:52) at hudson.plugins.projectstats.column.NumBuildsColumn.getStats(NumBuildsColumn.java:53)
In my screens I'm using the dashboard plugin with various statistics from our builds and it seems that it has some difficulties to compute them.
I'm using the LTS 1.532.1 and I just deployed the 1.532.2 RC but it doesn't help. I didn't notice this problem just after a plugin update thus I don't have a real clue about what to do.
- is related to
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-
- Resolved
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[JENKINS-21487] Frozen UI
Strange. I didn't yet removed projectstats plugin to see if it is the faulty one but this morning my instance is again broken (WSOD - white screen of the death) and this plugin doesn't appear at all in the threads dump : https://gist.github.com/aheritier/8642460
Another White Screen Of the Death : https://gist.github.com/aheritier/8665709
Another day, another WSOD : https://gist.github.com/aheritier/8704449
Note kutzi that i removed the projectstats plugin and it doesn't appear in today's thread dump
Try disabling the priority sorter plugin. It shows up in Jenkins-cron-thread-8 with a pretty deep stack after locking a queue others are blocked for.
Edited to add: Only in today's dump though.
—
"I didn't notice this problem just after a plugin update thus I don't have a real clue about what to do. "
Downgrade these plugins (if you don't remember which they were, sort the plugins folder by file modification time) and try to see whether that helped.
kutzi
added a comment - Latest stack dump shows the UnstableJobsPortlet (don't know from which plugin this comes) as a possible culprit.
I think the root cause for all your problems is that you have 'too many' old builds and some plugins which do costly stuff with old builds (like iterating all of them).
I'd consider it a bug in Jenkins core code, too, that it's really sooo costly to iterate old builds that even the UI gets frozen.
kutzi
added a comment - Latest stack dump shows the UnstableJobsPortlet (don't know from which plugin this comes) as a possible culprit.
I think the root cause for all your problems is that you have 'too many' old builds and some plugins which do costly stuff with old builds (like iterating all of them).
I'd consider it a bug in Jenkins core code, too, that it's really sooo costly to iterate old builds that even the UI gets frozen. Also as Jesse already pointed out on the mailing list (I think), you might be impacted by geResult() being expensive in maven builds - which Jesse fixed in https://github.com/jenkinsci/maven-plugin/commit/25fe2dd79fd0a92a8f81c969538135b6fabf5a22
So what are the plugin versions you're using?
kutzi
added a comment - - edited Also as Jesse already pointed out on the mailing list (I think), you might be impacted by geResult() being expensive in maven builds - which Jesse fixed in https://github.com/jenkinsci/maven-plugin/commit/25fe2dd79fd0a92a8f81c969538135b6fabf5a22
So what are the plugin versions you're using? Arnaud: Given kutzi's hypothesis about certain plugins loading too many builds, what's the result of this script in your Script Console (in Manage Jenkins):
def builds = Jenkins.instance.getAllItems(Job.class).collect { it.builds.size() }
println builds.sum()
println builds.sort()
Hi guys,
Another morning, another TD : https://gist.github.com/aheritier/8728536 and another one 20 min after : https://gist.github.com/aheritier/8728670
I may try to disable the priority sorter plugin.
I updated it several weeks ago but that's right that I changed its configuration recently to get ride of its legacy mode thus it may be a good culprit.
Good idea to check the plugins updates time from the disk (just for what was changed since january, the problem started around 20th Jan) :
0 -rw-r--r-- 1 jenkins jenkins 0 Jan 29 18:24 project-stats-plugin.jpi.disabled
164K -rw-r--r-- 1 jenkins jenkins 163K Jan 29 18:20 promoted-builds.jpi
11M -rw-r--r-- 1 jenkins jenkins 11M Jan 29 18:20 email-ext.jpi
11M -rw-r--r-- 1 jenkins jenkins 11M Jan 29 18:20 maven-plugin.jpi
0 -rw-r--r-- 1 jenkins jenkins 0 Jan 29 18:20 maven-plugin.jpi.pinned
48K -rw-r--r-- 1 jenkins jenkins 48K Jan 29 18:20 rebuild.jpi
1.2M -rw-r--r-- 1 jenkins jenkins 1.2M Jan 29 18:20 jenkins-multijob-plugin.jpi
52K -rw-r--r-- 1 jenkins jenkins 51K Jan 21 18:08 ldap.jpi
0 -rw-r--r-- 1 jenkins jenkins 0 Jan 21 18:08 ldap.jpi.pinned
32K -rw-r--r-- 1 jenkins jenkins 31K Jan 21 18:08 radiatorviewplugin.jpi
0 -rw-r--r-- 1 jenkins jenkins 0 Jan 21 18:07 disk-usage.jpi.disabled
5.1M -rw-r--r-- 1 jenkins jenkins 5.1M Jan 16 21:40 git.jpi
2.3M -rw-r--r-- 1 jenkins jenkins 2.3M Jan 16 10:23 git-client.jpi
100K -rw-r--r-- 1 jenkins jenkins 99K Jan 16 10:23 PrioritySorter.jpi
5.1M -rw-r--r-- 1 jenkins jenkins 5.1M Jan 9 10:54 build-pipeline-plugin.jpi
32K -rw-r--r-- 1 jenkins jenkins 30K Jan 9 10:54 nested-view.jpi
56K -rw-r--r-- 1 jenkins jenkins 53K Jan 9 10:54 translation.jpi
0 -rw-r--r-- 1 jenkins jenkins 0 Jan 9 10:54 translation.jpi.pinned
56K -rw-r--r-- 1 jenkins jenkins 56K Jan 9 10:54 buildresult-trigger.jpi
44K -rw-r--r-- 1 jenkins jenkins 44K Jan 6 18:31 multiple-scms.jpi
84K -rw-r--r-- 1 jenkins jenkins 83K Jan 6 18:31 xcode-plugin.jpi
UnstableJobsPortlet is from the dashboard plugin AFAIR.
About the number of builds kept I always reduced them a long time ago. If I have no error all jobs must be configured with :
<daysToKeep>15</daysToKeep>
<numToKeep>15</numToKeep>
<artifactDaysToKeep>10</artifactDaysToKeep>
<artifactNumToKeep>10</artifactNumToKeep>
The maven plugin version is 2.0.1 and 2.0.3 seems to be out. I will try to give it a try
New morning, new WSOD
https://gist.github.com/aheritier/8780445
https://gist.github.com/aheritier/8780533
Interesting thing between 2 thread dumps :
Feb 03, 2014 8:13:12 AM hudson.remoting.SynchronousCommandTransport$ReaderThread run
SEVERE: I/O error in channel prj01.exoplatform.org - acceptance
java.io.IOException: Unexpected termination of the channel
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:50)
Caused by: java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2598)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1318)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at hudson.remoting.Command.readFrom(Command.java:92)
at hudson.remoting.ClassicCommandTransport.read(ClassicCommandTransport.java:71)
at hudson.remoting.SynchronousCommandTransport$ReaderThread.run(SynchronousCommandTransport.java:48)
Exception in thread "Channel reader thread: prj01.exoplatform.org - acceptance" java.lang.OutOfMemoryError: Java heap space
I will try to investigate this OutOfMemoryError
I uploaded the memory dump here : http://storage.exoplatform.org/public/tmp/jenkins-20140201-heap.bin.bz2 (I didn't yet investigated)
having a quick look at the memory dump (http://storage.exoplatform.org/public/tmp/jenkins-20140201-heap.bin.bz2) it confirms that this is due to the dashboard-view plugin and its LatestBuilds portlet but the problem cannot from it only.
I keep only 15 builds max and it worked before and I didn't touch to the dashboard plugin since its latest release in october
For me it must be related to a change in core or in maven jobs (thus the maven integration plugin).
If someone can have a look at the memory dump to give some advices...
Daniel I missed your previous comment. I will try to get the number of builds with your script
Was referring to the memory issue I suggested on the list. You're not able to just increase heap memory, are you?
I probably have no idea what I'm doing, but shouldn't a full heap dump be as large as available JVM memory, minus some non-heap memory? This one is just ~800MB, similar to what the thread dumps you linked from the mailing list reported at the end.
I may increase a little bit the server heap and reduce the memory of executors or their numbers but I'm afraid to only move the problem for later.
About the heap dump I'm not an expert and I was also surprize to not have one of 4Gb but it finished with no error
I may try to recreate a new one tomorrow to see if it is larger and with more details
I may increase a little bit the server heap and reduce the memory of executors or their numbers but I'm afraid to only move the problem for later.
Consider separating Jenkins master from any executors actually running builds. If you don't have the machines, run a separate Jenkins slave process on the master so they run in different VMs. I expect this to make investigating issues easier.
Regarding the heap, remember that build records are soft references, so it could go from a situation where two threads trigger GC of each others' data to peaceful coexistence. Or not. Still, worth a try.
FWIW if you don't need fingerprints, don't use them. (You can move the fingerprints folder out of Jenkins home and restart Jenkins to try – note that you'll lose either these old or any newer fingerprints as they don't merge easily)
Stats about the # of builds
101397 [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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I'm surprised to find jobs with more than 15 results. I will investigate
I may stop local executors and use my additionnal agent to help to diagnose but I thought that local jobs where now running in their own VM ?
I have also in my todo one day to use a server with ssd drives for the jenkins master and only remote agents to not have such issue with the UI
I tried to have a look why I had so much by executing
for(item in Jenkins.instance.getAllItems(Job.class)){ if(item.builds.size() > 15){ println item.name println item.class println item.builds.size() } }
and it gives
org.exoplatform.calendar:calendar class hudson.maven.MavenModule 26 org.exoplatform.calendar:calendar-common class hudson.maven.MavenModule 29 org.exoplatform.calendar:calendar-component-create class hudson.maven.MavenModule 28 org.exoplatform.calendar:calendar-extension class hudson.maven.MavenModule 31 ...
These are maven sub modules. I don't understand why they aren't purged and perhaps the UI tries to load them while they are really useless. Only results at projects level are useful.
I upgraded to 1.532.2 and did some cleanup on our instance and the problem doesn't occur anymore
magnayn
added a comment - So, I'm re-opening this as I can re-create the "white screen of death" regularly on our Jenkins instance, on the latest LTS (1.565.1).
I think this is strongly influenced by slow(ish) disk (we are ZFS on Linux), because it's often sitting relatively low levels of CPU. We have a reasonable number of jobs, but nothing to write home about.
Running the groovy script from above seems to show it spending extreme amounts of time in what looks like parsing XML files. To get the size, it's triggering the following bit of trace:
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:234)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
- locked <0x00000000f9b461f0> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at java.io.PushbackInputStream.read(PushbackInputStream.java:139)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.getHeader(XmlHeaderAwareReader.java:79)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.<init>(XmlHeaderAwareReader.java:61)
at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:65)
at hudson.XmlFile.unmarshal(XmlFile.java:163)
at hudson.model.Run.reload(Run.java:321)
at hudson.model.Run.<init>(Run.java:309)
at hudson.model.AbstractBuild.<init>(AbstractBuild.java:173)
at hudson.maven.AbstractMavenBuild.<init>(AbstractMavenBuild.java:54)
at hudson.maven.MavenModuleSetBuild.<init>(MavenModuleSetBuild.java:146)
at sun.reflect.GeneratedConstructorAccessor58.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at jenkins.model.lazy.LazyBuildMixIn.loadBuild(LazyBuildMixIn.java:153)
at jenkins.model.lazy.LazyBuildMixIn$1.create(LazyBuildMixIn.java:134)
at hudson.model.RunMap.retrieve(RunMap.java:218)
at hudson.model.RunMap.retrieve(RunMap.java:56)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:687) - locked <0x0000000082951908> (a hudson.model.RunMap)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:670)
at jenkins.model.lazy.AbstractLazyLoadRunMap.getById(AbstractLazyLoadRunMap.java:542)
at jenkins.model.lazy.BuildReferenceMapAdapter.unwrap(BuildReferenceMapAdapter.java:42)
at jenkins.model.lazy.BuildReferenceMapAdapter.access$200(BuildReferenceMapAdapter.java:27)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter._unwrap(BuildReferenceMapAdapter.java:356)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter.access$400(BuildReferenceMapAdapter.java:248)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:271)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:269)
at hudson.util.AdaptedIterator.next(AdaptedIterator.java:54)
at com.google.common.collect.Iterators$7.computeNext(Iterators.java:648)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at java.util.Collections$UnmodifiableCollection$1.hasNext(Collections.java:1101)
at java.util.AbstractMap$2$1.hasNext(AbstractMap.java:392)
at hudson.util.RunList.size(RunList.java:108)
That seems really, really expensive to perform when all the caller cares about is the size of the runlist. Regardless of anything else, that looks like an easy optimisation.
Similarly, the home page lockups seem to be because it spends a long time figuring out "what was the last successful / last failed" build, which looks to be similar in nature. I wonder if that could be cached to speed it up without having to load the entire dataset.
It's possible that it's memory pressure causing the system to dump this stuff and it having to reload. I'm going to try increasing Xmx and maybe getting some dumps to figure out what's happening.
magnayn
added a comment - So, I'm re-opening this as I can re-create the "white screen of death" regularly on our Jenkins instance, on the latest LTS (1.565.1).
I think this is strongly influenced by slow(ish) disk (we are ZFS on Linux), because it's often sitting relatively low levels of CPU. We have a reasonable number of jobs, but nothing to write home about.
Running the groovy script from above seems to show it spending extreme amounts of time in what looks like parsing XML files. To get the size, it's triggering the following bit of trace:
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:234)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
locked <0x00000000f9b461f0> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at java.io.PushbackInputStream.read(PushbackInputStream.java:139)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.getHeader(XmlHeaderAwareReader.java:79)
at com.thoughtworks.xstream.core.util.XmlHeaderAwareReader.<init>(XmlHeaderAwareReader.java:61)
at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:65)
at hudson.XmlFile.unmarshal(XmlFile.java:163)
at hudson.model.Run.reload(Run.java:321)
at hudson.model.Run.<init>(Run.java:309)
at hudson.model.AbstractBuild.<init>(AbstractBuild.java:173)
at hudson.maven.AbstractMavenBuild.<init>(AbstractMavenBuild.java:54)
at hudson.maven.MavenModuleSetBuild.<init>(MavenModuleSetBuild.java:146)
at sun.reflect.GeneratedConstructorAccessor58.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at jenkins.model.lazy.LazyBuildMixIn.loadBuild(LazyBuildMixIn.java:153)
at jenkins.model.lazy.LazyBuildMixIn$1.create(LazyBuildMixIn.java:134)
at hudson.model.RunMap.retrieve(RunMap.java:218)
at hudson.model.RunMap.retrieve(RunMap.java:56)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:687)
locked <0x0000000082951908> (a hudson.model.RunMap)
at jenkins.model.lazy.AbstractLazyLoadRunMap.load(AbstractLazyLoadRunMap.java:670)
at jenkins.model.lazy.AbstractLazyLoadRunMap.getById(AbstractLazyLoadRunMap.java:542)
at jenkins.model.lazy.BuildReferenceMapAdapter.unwrap(BuildReferenceMapAdapter.java:42)
at jenkins.model.lazy.BuildReferenceMapAdapter.access$200(BuildReferenceMapAdapter.java:27)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter._unwrap(BuildReferenceMapAdapter.java:356)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter.access$400(BuildReferenceMapAdapter.java:248)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:271)
at jenkins.model.lazy.BuildReferenceMapAdapter$SetAdapter$1.adapt(BuildReferenceMapAdapter.java:269)
at hudson.util.AdaptedIterator.next(AdaptedIterator.java:54)
at com.google.common.collect.Iterators$7.computeNext(Iterators.java:648)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at java.util.Collections$UnmodifiableCollection$1.hasNext(Collections.java:1101)
at java.util.AbstractMap$2$1.hasNext(AbstractMap.java:392)
at hudson.util.RunList.size(RunList.java:108)
That seems really, really expensive to perform when all the caller cares about is the size of the runlist. Regardless of anything else, that looks like an easy optimisation.
Similarly, the home page lockups seem to be because it spends a long time figuring out "what was the last successful / last failed" build, which looks to be similar in nature. I wonder if that could be cached to speed it up without having to load the entire dataset.
It's possible that it's memory pressure causing the system to dump this stuff and it having to reload. I'm going to try increasing Xmx and maybe getting some dumps to figure out what's happening. magnayn: Remember that in the case of Maven, the number of projects is (1 + number of modules that ever existed) and the number of builds likewise.
Also, reopening with much different versions of everything isn't a good idea. So far it superficially doesn't even look like the same problem.
Also, you forgot to mention the versions of everything else, like Maven Plugin.
In general, with the information you currently provide, this would be more suited to a request for assistance on the lists or IRC than a Jira issue.
magnayn
added a comment - I think it is still an issue, but the issue is much bigger (I.E: it's dumb parsing thousands of files to render a simple UI homepage).
magnayn
added a comment - I think it is still an issue, but the issue is much bigger (I.E: it's dumb parsing thousands of files to render a simple UI homepage).
I'd guess from the stack dump that the projectstats plugin (whichever that is) is trying to get all historic builds - whcih seem to be a lot - from your jobs and thus causing the hang.