No memory left on ascari causes Hudson build failed?

Does anyone ever experience random Hudson server crash? See the following log:

ERROR: Failed to parse POMs
java.io.IOException: Cannot run program "env": java.io.IOException: error=12, Cannot allocate memory
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:459)
        at java.lang.Runtime.exec(Runtime.java:593)
        at java.lang.Runtime.exec(Runtime.java:431)
        at java.lang.Runtime.exec(Runtime.java:328)
        at org.codehaus.plexus.util.cli.CommandLineUtils.getSystemEnvVars(CommandLineUtils.java:250)
        at org.codehaus.plexus.util.cli.CommandLineUtils.getSystemEnvVars(CommandLineUtils.java:216)
        at org.apache.maven.project.interpolation.RegexBasedModelInterpolator.<init>(RegexBasedModelInterpolator.java:63)
        at sun.reflect.GeneratedConstructorAccessor120.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at java.lang.Class.newInstance0(Class.java:355)
        at java.lang.Class.newInstance(Class.java:308)
        at org.codehaus.plexus.component.factory.java.JavaComponentFactory.newI开发者_运维问答nstance(JavaComponentFactory.java:44)
        at org.codehaus.plexus.DefaultPlexusContainer.createComponentInstance(DefaultPlexusContainer.java:1464)
        at org.codehaus.plexus.component.manager.AbstractComponentManager.createComponentInstance(AbstractComponentManager.java:93)

It is now installed on 32 bit Debian 5 Linux with 4 GB RAM along with SVN and Sonar, I'd like to know what would be the root cause of this problem ? I'm planning to migrate it to Ubuntu 10.04 LTS 64 bit with SVN and Sonar as well, but this time I'll give 8 GB for the RAM.

4GB of RAM seems enough to run Hudson, but it seems you are running out of memory due to too many processes.

Try increase your swap partition size.

Your swap partition should generally be the size of your RAM, if not more.

PS: What is it currently at?

I have the same problem, my server config is:

$ free -m
             total       used       free     shared    buffers     cached
Mem:          1036        982         53          0         13         39
-/+ buffers/cache:        929        106
Swap:         2047        833       1214

This is how I fixed the problem (under root):

echo 1 > /proc/sys/vm/overcommit_memory