I have found JDK-8267246 to cause jtreg failure due to type of floating point in different locales, when locale is en, you have 6.25, when locate is ru_RU it's 6,25

So it results in this error:

Running test 'jtreg:test/hotspot/jtreg:tier1'
Improperly specified VM option 'MaxRAMPercentage=6,25'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

workaround is unset LANG before the run