Memory leak in IcedTea7 - loading resources from JAR files

[Pavel Tisnovsky]

Hi all,

I think there's a memory leak in IcedTea7 which occurs during loading
resources from JAR files. Simple reproducer is stored in an attachment.
This reproducer tries to read contents of one file (it's a copy of GNU
licence ;-) from JAR file in a loop.

If this test is started using IcedTea6 (6-1.9.7 to be precise), heap
space is quite small and does not increasing as can be seen on jconsole
screenshot "IcedTea6-1.9.7.png" which is stored in an attachment.

But under IcedTea7-1.14 heap size is increasing - you can see this
behaviour on screenshot "IcedTea7-1.14.png". And in some circumstances
(using relative small maximum heap size, for example), the test fails.

This can be simply reproduced:

jawa28:~/1/mem_leak/$ /jck/icedtea/openjdk.build/j2sdk-image/bin/java
-Xmx40M -cp .:resource.jar LoadResource

iteration# 0
...
...
...
iteration# 2038
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at java.util.zip.InflaterInputStream.<init>(InflaterInputStream.java:88)
    at java.util.zip.ZipFile$1.<init>(ZipFile.java:362)
    at java.util.zip.ZipFile.getInputStream(ZipFile.java:362)
    at java.util.jar.JarFile.getInputStream(JarFile.java:401)
    at
sun.net.www.protocol.jar.JarURLConnection.getInputStream(JarURLConnection.java:162)
    at java.net.URL.openStream(URL.java:1035)
    at
java.lang.ClassLoader.getSystemResourceAsStream(ClassLoader.java:1372)
    at LoadResource.main(LoadResource.java:12)

Cheers
Pavel
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