SOEDeeplyNestedBlocksTest FAILED in Test_openjdk21_hs_sanity.openjdk_s390x_linux

**Failing Test Info**
Test Name: tools/javac/patterns/SOEDeeplyNestedBlocksTest.java
Test Duration: 3 seconds.
Machine it fails on: [test-docker-sles15-s390x-1](https://ci.adoptium.net/computer/test-docker-sles15-s390x-1), [test-docker-ubi9-s390x-1](https://ci.adoptium.net/computer/test-docker-ubi9-s390x-1), [test-marist-sles15-s390x-3](https://ci.adoptium.net/computer/test-marist-sles15-s390x-3)
Machines it passes on (if intermittent):

**Jenkins Test Job Info**
Jenkins Test Job Name: (Example: Test_openjdk8_hs_extended.openjdk_arm_linux_testList_0)
Jenkins Test Job URL: https://ci.adoptium.net/job/Test_openjdk21_hs_sanity.openjdk_s390x_linux_testList_1/101/
TRSS link for the build (if available): https://trss.adoptium.net/allTestsInfo?buildId=6a85223b4e4e710078f9dc5c&limit=1

**Deep History Link from TRSS (if available)** https://trss.adoptium.net/deepHistory?testId=6a8523854e4e710078f9e3f2

** Rerun in Grinder Link (if available) or Steps to Reproduce**

[Grinder rerun link](https://ci.adoptium.net/job/Grinder/parambuild/?SDK_RESOURCE=customized&TARGET=langtools_custom&BASE_DOCKER_REGISTRY_CREDENTIAL_ID=&TEST_FLAG=&UPSTREAM_TEST_JOB_NAME=Test_openjdk21_hs_sanity.openjdk_s390x_linux&MODE=ENTRYPOINT&DOCKER_REQUIRED=false&ACTIVE_NODE_TIMEOUT=10&VENDOR_TEST_DIRS=%2Ftest%2Fsystem&EXTRA_DOCKER_ARGS=&TKG_OWNER_BRANCH=adoptium%3Amaster&OPENJ9_SYSTEMTEST_OWNER_BRANCH=eclipse%3Amaster&PLATFORM=s390x_linux&GENERATE_JOBS=false&KEEP_REPORTDIR=true&PERSONAL_BUILD=false&DOCKER_REGISTRY_DIR=&ADOPTOPENJDK_REPO=https%3A%2F%2Fgithub.com%2Fadoptium%2Faqa-tests.git&RERUN_ITERATIONS=0&SETUP_JCK_RUN=false&DOCKER_REGISTRY_URL_CREDENTIAL_ID=&LABEL=&EXTRA_OPTIONS=&CUSTOMIZED_SDK_URL=https%3A%2F%2Fci.adoptium.net%2Fjob%2Fbuild-scripts%2Fjob%2Fjobs%2Fjob%2Frelease%2Fjob%2Fjobs%2Fjob%2Fjdk21u%2Fjob%2Fjdk21u-release-linux-s390x-temurin%2F36%2F%2Fartifact%2Fworkspace%2Ftarget%2FOpenJDK21U-jdk_s390x_linux_hotspot_21.0.12.1_1.tar.gz+https%3A%2F%2Fci.adoptium.net%2Fjob%2Fbuild-scripts%2Fjob%2Fjobs%2Fjob%2Frelease%2Fjob%2Fjobs%2Fjob%2Fjdk21u%2Fjob%2Fjdk21u-release-linux-s390x-temurin%2F36%2F%2Fartifact%2Fworkspace%2Ftarget%2FOpenJDK21U-testimage_s390x_linux_hotspot_21.0.12.1_1.tar.gz+https%3A%2F%2Fci.adoptium.net%2Fjob%2Fbuild-scripts%2Fjob%2Fjobs%2Fjob%2Frelease%2Fjob%2Fjobs%2Fjob%2Fjdk21u%2Fjob%2Fjdk21u-release-linux-s390x-temurin%2F36%2F%2Fartifact%2Fworkspace%2Ftarget%2FOpenJDK21U-sbom_s390x_linux_hotspot_21.0.12.1_1.json&BUILD_IDENTIFIER=&JENKINS_KEY=&ADOPTOPENJDK_BRANCH=v1.0.14.1-release&LIGHT_WEIGHT_CHECKOUT=false&BUILD_TYPE=release&USE_JRE=false&ARTIFACTORY_SERVER=&KEEP_WORKSPACE=false&JDK_VERSION=21&USER_CREDENTIALS_ID=&DOCKER_REGISTRY_URL=&ITERATIONS=1&VENDOR_TEST_REPOS=https%3A%2F%2Fgithub.com%2Fadoptium%2Ftemurin-build&JCK_GIT_BRANCH=master&JDK_REPO=&JCK_GIT_REPO=&OPENJ9_BRANCH=master&OPENJ9_SHA=&VENDOR_TEST_BRANCHES=v2026.08.01&OPENJ9_REPO=https%3A%2F%2Fgithub.com%2Feclipse-openj9%2Fopenj9.git&UPSTREAM_JOB_NAME=&CLOUD_PROVIDER=&CUSTOM_TARGET=tools%2Fjavac%2Fpatterns%2FSOEDeeplyNestedBlocksTest.java&VENDOR_TEST_SHAS=&JDK_BRANCH=&LABEL_ADDITION=&ARTIFACTORY_REPO=&ARTIFACTORY_ROOT_DIR=&UPSTREAM_TEST_JOB_NUMBER=261&DOCKERIMAGE_TAG=&TEST_TIME=&JDK_IMPL=hotspot&SSH_AGENT_CREDENTIAL=&AUTO_DETECT=true&SLACK_CHANNEL=aqavit-bot&DYNAMIC_COMPILE=false&RELATED_NODES=&ADOPTOPENJDK_SYSTEMTEST_OWNER_BRANCH=adoptium%3Amaster&APPLICATION_OPTIONS=&CUSTOMIZED_SDK_URL_CREDENTIAL_ID=eclipse_temurin_bot_email_and_token&ARCHIVE_TEST_RESULTS=false&NUM_MACHINES=&OPENJDK_SHA=&TRSS_URL=&RERUN_FAILURE=false&USE_TESTENV_PROPERTIES=true&BUILD_LIST=openjdk&ADDITIONAL_ARTIFACTS_REQUIRED=&UPSTREAM_JOB_NUMBER=&STF_OWNER_BRANCH=adoptium%3Amaster&TIME_LIMIT=10&JVM_OPTIONS=&PARALLEL=None)

**Java Version output (from console output)**

```
20:08:51 openjdk version "21.0.12.1" 2026-08-18 LTS
20:08:51 OpenJDK Runtime Environment Temurin-21.0.12.1+1 (build 21.0.12.1+1-LTS)
20:08:51 OpenJDK 64-Bit Server VM Temurin-21.0.12.1+1 (build 21.0.12.1+1-LTS, mixed mode, sharing)
```

**Relevant Console Output (showing exceptions/errors/crashes)**

```
21:06:48 The system is out of resources.
21:06:48 Consult the following stack trace for details.
21:06:48 java.lang.StackOverflowError
21:06:48 at jdk.compiler/com.sun.tools.javac.code.Types$UnaryVisitor.visit(Types.java:4980)
21:06:48 at jdk.compiler/com.sun.tools.javac.code.Types.supertype(Types.java:2520)
21:06:48 at jdk.compiler/com.sun.tools.javac.comp.Resolve.findInheritedMemberType(Resolve.java:2266)
21:06:48 at jdk.compiler/com.sun.tools.javac.comp.Resolve.findType(Resolve.java:2371)
21:06:48 at jdk.compiler/com.sun.tools.javac.comp.Resolve.findIdentInternal(Resolve.java:2432)
21:06:48 at jdk.compiler/com.sun.tools.javac.comp.Resolve.findIdent(Resolve.java:2418)
21:06:48 at jdk.compiler/com.sun.tools.javac.comp.Resolve.resolveIdent(Resolve.java:2710)
21:06:48 at jdk.compiler/com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:4332)
etc etc
```

**Attach or link to relevant artifacts**
In the case of test failures, the Jenkins Test Job has test_output.tar.gz artifacts that contain extra logs and core files in the case of crashes. Please download and inspect these files. Copy relevant files to an accessible location that can be linked to, or attach relevant files to this issue directly.

[SOEDeeplyNestedBlocksTest.jtr.txt](https://github.com/user-attachments/files/31471076/SOEDeeplyNestedBlocksTest.jtr.txt)

Start with tools/javac/patterns/SOEDeeplyNestedBlocksTest.java and read SOEDeeplyNestedBlocksTest.jtr.txt alongside the reported javac stack trace. Reproduce it through the linked Grinder rerun on s390x and inspect the Jenkins test_output.tar.gz artifacts. Done means the test completes without StackOverflowError on the affected machines and passes in the relevant job.

Written by the indexing model from the issue text.