Hi Danill,

The fix looks good. Were you able to reproduce this problem, and then after the fix run the tests enough times to be confident this really resolves the issue?

Are you going to close JDK-8194057 as a dup?



On 3/13/18 10:26 PM, Daniil Titov wrote:
Please review the changes that fix intermittent timeout failure of 
serviceability/dcmd/framework/* tests.

The problem here is that these tests invoke jcmd in different ways and one of 
such ways is when a main class is passed to the jcmd as a VM identifier. The 
main class for jtreg test is com.sun.javatest.regtest.agent.MainWrapper and in 
some cases more than one test are running in parallel and there are multiple 
Java processes with com.sun.javatest.regtest.agent.MainWrapper as a main class 
. When it happens jcmd iterates over all Java processes that match the 
condition (the main class equals to com.sun.javatest.regtest.agent.MainWrapper) 
and executes the command for each of them. That results in the jcmd invokes the 
given command multiple times and attaches to Java processes not related to the 
current test.

The fix makes serviceability/dcmd/framework/* tests non-concurrent to ensure 
that they don't interact with other tests.

Bug: https://bugs.openjdk.java.net/browse/JDK-8166642
Webrev: http://cr.openjdk.java.net/~dtitov/8166642/webrev.01

The tests ran successfully with Mach5.

Best regards,

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