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https://issues.apache.org/jira/browse/CXF-9171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andriy Redko reassigned CXF-9171:
---------------------------------
Assignee: Andriy Redko
> DelayedCachedOutputStreamCleaner thread accumulation after CVE-2025-23184 fix
> -----------------------------------------------------------------------------
>
> Key: CXF-9171
> URL: https://issues.apache.org/jira/browse/CXF-9171
> Project: CXF
> Issue Type: Bug
> Components: Core
> Affects Versions: 4.1.0, 3.5.10, 3.6.5, 4.0.6
> Environment: JBoss/Wildfly
> Reporter: Aaron Ogburn
> Assignee: Andriy Redko
> Priority: Major
> Fix For: 4.1.4, 3.6.9, 4.0.10
>
> Attachments: CXF-9171.patch
>
>
> After the CVE-2025-23184 fix (CXF-7396), DelayedCachedOutputStreamCleaner
> timer threads can be problematic and can contribute to unwanted thread growth
> and possibly classloader leaks potentially to the point of thread OOMEs or
> metaspace OOMEs. This now creates a unique Timer and thread for every bus
> instance created just to handle a single 30 min default interval task even if
> there is no closeable yet registered so this seems excessive and a bus is a
> much more leaky object as a result. The created Timer thread will also
> inherit contextClassLoaders and that may then preserve some app classloader
> reference to possibly influence additional classloader leaks.
> For instance, in the context of WildFly/JBoss it maintains a WeakHashMap
> storing busses with a bus keyed off a classloader. But the bus can now
> maintain a strong reference to that classloader through the
> DelayedCachedOutputStreamCleaner TimerThread's contextClassLoader so this
> WeakHashMap can no longer self clean:
> {code:java}
> Class Name
> | Ref. Objects
> | Shallow Heap | Ref. Shallow Heap | Retained Heap
> --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> [5] class org.jboss.wsf.stack.cxf.client.configuration.JBossWSBusFactory @
> 0x5d513a898 |
> 1 | 8 | 96 | 24,503,336
> '- classLoaderBusses java.util.WeakHashMap @ 0x5f846cd30
> | 1
> | 48 | 96 | 24,503,328
> '- table java.util.WeakHashMap$Entry[32] @ 0x5d6af4dd0
> | 1
> | 144 | 96 | 24,503,232
> '- [28] java.util.WeakHashMap$Entry @ 0x5d6af4e60
> | 1
> | 40 | 96 | 3,793,016
> '- value org.apache.cxf.bus.extension.ExtensionManagerBus @
> 0x5d6af4e88 |
> 1 | 56 | 96 | 3,792,976
> '- extensions java.util.concurrent.ConcurrentHashMap @
> 0x5d6af5080 |
> 1 | 64 | 96 | 3,616
> '- table java.util.concurrent.ConcurrentHashMap$Node[64] @
> 0x5d6af50c0 |
> 1 | 272 | 96 | 3,552
> '- [2] java.util.concurrent.ConcurrentHashMap$Node @
> 0x5d6e93778 |
> 1 | 32 | 96 | 32
> '- val
> org.apache.cxf.io.DelayedCachedOutputStreamCleaner @ 0x5d6e89398
> | 1 | 24 |
> 96 | 256
> '- cleaner
> org.apache.cxf.io.DelayedCachedOutputStreamCleaner$DelayedCleanerImpl @
> 0x5d6e893b0 | 1 | 32 |
> 96 | 232
> '- timer java.util.Timer @ 0x5d6e89498
> | 1
> | 24 | 96 | 720
> '- thread java.util.TimerThread @ 0x5cf230188
> DelayedCachedOutputStreamCleaner | 1
> | 128 | 96 | 144
> '- contextClassLoader
> org.jboss.ws.common.utils.DelegateClassLoader @ 0x5cf1e9b68
> | 1 | 72 | 96 | 560
> '- parent, parent my.app.ClassLoader @
> 0x5cf1e8af0| 1 | 96 | 96 | 11,565,128
> {code}
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