I see this when running:

gc/stringdedup/TestStringDeduplicationInterned.java

with:

-Xcomp -XX:CompileThreshold=100

Failure is intermittent but it seems to be fairly easy to reproduce.

*** non-oop 0x00000000fbf80558 found at 0x00007f55ffe36536 (offset 558)
*** non-oop 0x00000000fbf80558 found at 0x00007f55ffe36554 (offset 588)
*** non-oop 0x00000000fbf80558 found at 0x00007f55ffe36698 (offset 912)
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/roland/jdk-jdk/src/hotspot/share/code/nmethod.cpp:2950), pid=2778052, tid=2778072
# assert(voc.ok()) failed: embedded oops must be OK
#
# JRE version: OpenJDK Runtime Environment (24.0) (fastdebug build 24-internal-adhoc.roland.jdk-jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 24-internal-adhoc.roland.jdk-jdk, compiled mode, sharing, tiered, compressed oops, compressed class ptrs, shenandoah gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0x1537158] nmethod::verify()+0x488
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h" (or dumping to /home/roland/tmp/core.2778052)
#
# An error report file with more information is saved as:
# /home/roland/tmp/hs_err_pid2778052.log
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#