Hello,
We are upgrading CAS from 6.6 to 7.3.3. We deploy a RPM package that wraps
the cas overlay war file (with embedded Tomcat) to AWS EC2 instances. We
are noticing that Tomcat is not properly responding to requests and seems
to be deadlocked on something. Here’s a portion of the thread dump of the
tomcat process:
2026-02-17 18:50:08
Full thread dump OpenJDK 64-Bit Server VM (21.0.10+7-LTS mixed mode,
sharing):
Threads class SMR info:
_java_thread_list=0x00007f827c004610, length=99, elements={
0x00007f830c02b5a0, 0x00007f830c7e25e0, 0x00007f830c7e3b50,
0x00007f830c7e52e0,
0x00007f830c7e6920, 0x00007f830c7e7ec0, 0x00007f830c7e9a00,
0x00007f830c7eb0c0,
0x00007f830c8be6b0, 0x00007f830c8c0ca0, 0x00007f830c90daf0,
0x00007f830dc5d150,
0x00007f830eb79530, 0x00007f830eb7a5b0, 0x00007f8228bb5980,
0x00007f824030bdf0,
0x00007f822c004a20, 0x00007f8240170ab0, 0x00007f8228bf2b60,
0x00007f82292b7ce0,
0x00007f822c016a90, 0x00007f830ed3a1d0, 0x00007f830ee8e5b0,
0x00007f830ee8d8f0,
0x00007f830ee911d0, 0x00007f830ee92360, 0x00007f830ee934f0,
0x00007f830ee94570,
0x00007f830ee51390, 0x00007f830ee52300, 0x00007f830ee535a0,
0x00007f830ee54850,
0x00007f830ee5dbc0, 0x00007f830edcb610, 0x00007f830edcccd0,
0x00007f8228984a10,
0x00007f82289aa9f0, 0x00007f82289af630, 0x00007f8228afec60,
0x00007f8228affea0,
0x00007f8228b011a0, 0x00007f82289b5300, 0x00007f8228a89850,
0x00007f822c01bf30,
0x00007f830edbb9e0, 0x00007f8270005300, 0x00007f8228b6a390,
0x00007f8228b6bcd0,
0x00007f8228b6c890, 0x00007f8228b6d5c0, 0x00007f8228624870,
0x00007f82286252e0,
0x00007f8228626ee0, 0x00007f82286280d0, 0x00007f8228685d60,
0x00007f8228687450,
0x00007f82286889c0, 0x00007f8228689f30, 0x00007f822868b940,
0x00007f822868d0d0,
0x00007f822868e480, 0x00007f8228e5a8e0, 0x00007f8228e2fe10,
0x00007f8228e30d50,
0x00007f8228e85130, 0x00007f8228e894d0, 0x00007f8228e8a8d0,
0x00007f822840b5a0,
0x00007f8228410c60, 0x00007f8228412940, 0x00007f830fe2e5d0,
0x00007f830fe2fda0,
0x00007f830fe313c0, 0x00007f830fe33da0, 0x00007f830fe51010,
0x00007f822012e320,
0x00007f82480975a0, 0x00007f8254053a90, 0x00007f825007a500,
0x00007f826000afe0,
0x00007f826c4f16f0, 0x00007f82696ad010, 0x00007f8229532eb0,
0x00007f8220294f90,
0x00007f828400f0a0, 0x00007f828003c0c0, 0x00007f82d4002820,
0x00007f822940c1c0,
0x00007f82293a2b70, 0x00007f82e4055120, 0x00007f82340362c0,
0x00007f822040e8d0,
0x00007f823800a970, 0x00007f824401db40, 0x00007f82415076a0,
0x00007f82203acb70,
0x00007f8270003590, 0x00007f827000b900, 0x00007f827c003700
}
"Log4j2-TF-1-AsyncLogger[AsyncContext@5a10411]-1" #20 [93605] daemon prio=5
os_prio=0 cpu=12247.31ms elapsed=10972.85s tid=0x00007f830dc5d150 nid=93605
in Object.wait() [0x00007f8291a11000]
java.lang.Thread.State: TIMED_WAITING (on object monitor)
at java.lang.Object.wait0([email protected]/Native Method)
- waiting on <no object reference available>
at java.lang.Object.wait([email protected]/Object.java:366)
at java.lang.Object.wait([email protected]/Object.java:488)
at com.lmax.disruptor.util.Util.awaitNanos(Util.java:118)
at
com.lmax.disruptor.TimeoutBlockingWaitStrategy.waitFor(TimeoutBlockingWaitStrategy.java:47)
- locked <0x00000006051d25d8> (a java.lang.Object)
at
com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:56)
at
com.lmax.disruptor.BatchEventProcessor.processEvents(BatchEventProcessor.java:156)
at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:122)
at java.lang.Thread.runWith([email protected]/Thread.java:1596)
at java.lang.Thread.run([email protected]/Thread.java:1583)
"Log4j2-TF-12-Scheduled-6" #36 [93633] daemon prio=5 os_prio=0 cpu=63.87ms
elapsed=10965.76s tid=0x00007f830eb79530 nid=93633 waiting on condition
[0x00007f829150c000]
java.lang.Thread.State: TIMED_WAITING (parking)
at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
- parking to wait for <0x0000000603ded6c8> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at
java.util.concurrent.locks.LockSupport.parkNanos([email protected]/LockSupport.java:269)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos([email protected]/AbstractQueuedSynchronizer.java:1797)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take([email protected]/ScheduledThreadPoolExecutor.java:1182)
at
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take([email protected]/ScheduledThreadPoolExecutor.java:899)
at
java.util.concurrent.ThreadPoolExecutor.getTask([email protected]/ThreadPoolExecutor.java:1070)
at
java.util.concurrent.ThreadPoolExecutor.runWorker([email protected]/ThreadPoolExecutor.java:1130)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run([email protected]/ThreadPoolExecutor.java:642)
at java.lang.Thread.runWith([email protected]/Thread.java:1596)
at java.lang.Thread.run([email protected]/Thread.java:1583)
We’re unable to figure out what is causing this to occur. Has anyone
encountered anything similar? Where could we look to try and get more
details? Thank you!
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