Failure on CPUs allowing loads reordering: assert(_tasks[t] == 1) failed: What else?

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STDOUT:
CompileCommand: dontinline compiler/codecache/stress/Helper$TestCase.method
For random generator using seed: 5925692144458820626
To re-run test with same seed value please add "-Djdk.test.lib.random.seed=5925692144458820626" to command line.
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/workgroup.cpp:436
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/loongson/fujie/upgrade/jdk-mips-upgrade/src/hotspot/share/gc/shared/workgroup.cpp:436), pid=8637, tid=8662
# assert(_tasks[t] == 1) failed: What else?
#
# JRE version: OpenJDK Runtime Environment (14.0) (fastdebug build 14-internal+0-adhoc.loongson.jdk-mips-upgrade)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 14-internal+0-adhoc.loongson.jdk-mips-upgrade, mixed mode, sharing, compressed oops, g1 gc, linux-mips64el)
# Problematic frame:
# V [libjvm.so+0x15d8144] SubTasksDone::try_claim_task(unsigned int)+0xb4
#
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The failure was first observed on our Loongson CPUs which allow loads reordering with the following test
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make test TEST="compiler/codecache/stress/UnexpectedDeoptimizationTest.java" CONF=fastdebug
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