The following test failed an assertion in the JDK14 CI:

compiler/codecache/stress/UnexpectedDeoptimizationAllTest.java

Here's a snippet from the log file:

----------System.out:(23/1409)*----------
CompileCommand: dontinline compiler/codecache/stress/Helper$TestCase.method
For random generator using seed: -3269928455469474852
To re-run test with same seed value please add "-Djdk.test.lib.random.seed=-3269928455469474852" to command line.
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=t:/workspace/open/src/hotspot/share/code/nmethod.cpp:1296
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (t:/workspace/open/src/hotspot/share/code/nmethod.cpp:1296), pid=3872, tid=19068
# assert(!is_zombie()) failed: should not already be a zombie
#
# JRE version: Java(TM) SE Runtime Environment (14.0+16) (fastdebug build 14-ea+16-629)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 14-ea+16-629, mixed mode, sharing, tiered, compressed oops, serial gc, windows-amd64)
# Core dump will be written. Default location: T:\\testoutput\\test-support\\jtreg_open_test_hotspot_jtreg_hotspot_compiler_all_gcs\\scratch\\6\\hs_err_pid3872.mdmp
#
Unsupported internal testing APIs have been used.

# An error report file with more information is saved as:
# T:\\testoutput\\test-support\\jtreg_open_test_hotspot_jtreg_hotspot_compiler_all_gcs\\scratch\\6\\hs_err_pid3872.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.java.com/bugreport/crash.jsp
#
----------System.err:(0/0)----------