WildFly 26.0.0 high CPU usage on default i/o thread

[Sascha Janz]

Hi,

we use WildFly 26.0.0 and Java 17.0.4 on a Windows Server. 

After starting the server we got 100% CPU on default i/o thread without any application running. 

"default I/O-9" #132 prio=5 os_prio=0 cpu=86312.50ms elapsed=237.84s tid=0x000002a5768bc7b0 nid=0x1938 runnable  [0x000000ba2ddfe000]
   java.lang.Thread.State: RUNNABLE
at java.nio.DirectByteBuffer.slice(java...@17.0.4/DirectByteBuffer.java:248)
at java.nio.DirectByteBuffer.slice(java...@17.0.4/DirectByteBuffer.java:40)
at org.xnio.ByteBufferSlicePool$Slice.slice(ByteBufferSlicePool.java:317)
at org.xnio.ByteBufferSlicePool.allocate(ByteBufferSlicePool.java:136)
at io.undertow.server.XnioByteBufferPool.allocate(XnioByteBufferPool.java:53)
at io.undertow.server.protocol.http.AlpnOpenListener$AlpnConnectionListener.handleEvent(AlpnOpenListener.java:352)
at io.undertow.server.protocol.http.AlpnOpenListener$AlpnConnectionListener.handleEvent(AlpnOpenListener.java:341)
at org.xnio.ChannelListeners.invokeChannelListener(ChannelListeners.java:92)
at org.xnio.conduits.ReadReadyHandler$ChannelListenerHandler.readReady(ReadReadyHandler.java:66)
at io.undertow.protocols.ssl.SslConduit$SslReadReadyHandler.readReady(SslConduit.java:1273)
at org.xnio.nio.NioSocketConduit.handleReady(NioSocketConduit.java:89)
at org.xnio.nio.WorkerThread.run(WorkerThread.java:591)

ever someone got such problem? any ideas?

Thanks and Regards

Sascha

[Michael]

Hi,

did you ever figure this out?

Cheers!

[Adrian Bogdan Hanchevici]

Hello,

What JDK are you using?

Bogdan

[John Saccoccio]

If there's SSLConduit noise in a stack dump, it's not going to be fixed in that version of Wildfly:

Resolution Apply the latest cumulative patch for JBoss EAP 7.4. The fix for this issue has been incorporated in JBoss EAP 7.4.10+ (CP10) Apply the latest cumulative patch for RH-SSO 7.6. The fix for this issue has been incorporated in RH-SSO 7.6.4+ by RHSA-2023:3892 Downgrade Java to 1.8.0_351 / 11.0.17 / 17.0.5 or earlier as a workaround until updating to the versions that include the fix.

[Adrian Bogdan Hanchevici]

Do you know if there is a patch available for Wildfly 26?

Bogdan

[John Saccoccio]

I wish! You can try swapping out the applicable undertow module libraries:  https://bugzilla.redhat.com/show_bug.cgi?id=2174246

We chose to downgrade our JDK, seemed the more conservative option.

Only instructions I've seen are to build a bootable jar using Galleon:  https://groups.google.com/g/wildfly/c/zVCAb7Kwz2U

[VJ REDDY]

Hi All,

Did anyone ever have solution for this how to resolve it?

I really appreciate if anyone will reply...

Thanks,

VJ