Wildfly 27.0.1 high CPU load on default i/o thread

Michael

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Oct 19, 2023, 2:07:25 AM10/19/23

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Hello,

long story short, I believe I'm running into this issue (but I can't read the full article):

https://access.redhat.com/solutions/6997164

The process running WF is stuck consuming 100% CPU load and there is one i/o thread that seems to be causing it. However, I'm struggling to reproduce the problem. I just see it happening randomly from time to time.

Any ideas? Thanks very much!

Michael

"default I/O-31" #180 prio=5 os_prio=0 cpu=91667480.39ms elapsed=704637.94s tid=0x0000557a650b1a50 nid=0x3fc12 runnable [0x00007f023971b000]
java.lang.Thread.State: RUNNABLE
at sun.security.ssl.SSLEngineImpl.checkParams(java...@17.0.8.1/SSLEngineImpl.java:457)
at sun.security.ssl.SSLEngineImpl.wrap(java...@17.0.8.1/SSLEngineImpl.java:142)
at sun.security.ssl.SSLEngineImpl.wrap(java...@17.0.8.1/SSLEngineImpl.java:123)
at javax.net.ssl.SSLEngine.wrap(java...@17.0.8.1/SSLEngine.java:524)
at io.undertow.server.protocol.http.ALPNLimitingSSLEngine.wrap(ALPNLimitingSSLEngine.java:64)
at io.undertow.protocols.ssl.SslConduit.wrapAndFlip(SslConduit.java:1009)
at io.undertow.protocols.ssl.SslConduit.doWrap(SslConduit.java:940)
- locked <0x000000040cdbd020> (a io.undertow.protocols.ssl.SslConduit)
at io.undertow.protocols.ssl.SslConduit.doHandshake(SslConduit.java:673)
at io.undertow.protocols.ssl.SslConduit$5$1.run(SslConduit.java:1153)
- locked <0x000000040cdbd020> (a io.undertow.protocols.ssl.SslConduit)
at org.xnio.nio.WorkerThread.safeRun(WorkerThread.java:612)
at org.xnio.nio.WorkerThread.run(WorkerThread.java:479)

Adrian Bogdan Hanchevici

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Oct 19, 2023, 2:51:22 AM10/19/23

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Hello,

What JDK are you using?

Bogdan

Michael

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Oct 19, 2023, 3:29:51 AM10/19/23

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17.0.8.1 on Linux

John Saccoccio

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Oct 19, 2023, 12:22:37 PM10/19/23

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No patch, only paid support for JBoss EAP: See https://access.redhat.com/solutions/6997164

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.

Michael

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Oct 19, 2023, 2:48:03 PM10/19/23

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Do you have any idea how to reproduce the issue? I'd like to test if my system is really affected.

Apparently the issue is fixed in Undertow 2.3.5. Upgrading Wildfly to 30 which is shipped with 2.3.10 is an option.

Adrian Bogdan Hanchevici

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Oct 20, 2023, 9:50:48 AM10/20/23

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

Bogdan

Michael

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Oct 20, 2023, 9:53:59 AM10/20/23

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You could just upgrade the undertow-core module. That's what I have done.

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