When running the following test program:
```
dev-dsk-kdnilsen-temp-2a-98f9178d % nohup make test TEST="gc/shenandoah/compiler/TestClone.java#generational-no-coops-verify" TEST_VM_OPTS="-Xlog:gc*=info" JTREG="REPEAT_COUNT=1000 javatest.maxOutputSize=1000000" CONF=fastdebug >test-failure.out 2>test-failure.err &
```
We have observed rare occurrences of this message:
```
# Internal Error (/home/ANT.AMAZON.COM/kdnilsen/github/jdk.freeset-has-authoritative-tallies/src/hotspot/share/gc/shenandoah/shenandoahScanRemembered.cpp:630), pid=1374671, tid=1374737
# assert(*start_bp == CardTable::clean_card_val()) failed: Should be clean: 0x000000006fffc000
```

The problem arises because of an error in the way the assert is written.