There are two ZTestEntry symbols, one in test_zList.cpp and one in test_zIntrusiveRBTree.cpp. When building with slowdebug, the ZList tests in test_zList.cpp use the ZTestEntry defined in test_zIntrusiveRBTree.cpp, which results in a crash.

Running test 'gtest:ZList/server'
Note: Google Test filter = ZList*
[==========] Running 2 tests from 1 test suite.
[----------] Global test environment set-up.
[----------] 2 tests from ZListTest
[ RUN ] ZListTest.test_insert
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (open/src/hotspot/share/gc/z/zList.inline.hpp:52), pid=427706, tid=427706
# assert(_next == this) failed: Should not be in a list
#
# JRE version: ((uninitialized)) (slowdebug build )
# Java VM: Java HotSpot(TM) 64-Bit Server VM (slowdebug 25-internal-LTS-2025-05-02-1245029.cphillim..., mixed mode, sharing, tiered, compressed class ptrs, unknown gc, linux-amd64)
# Core dump will be written. Default location: /build/linux-x64/test-support/gtest_ZList_server/core.427706