RFR 8195627: [Graal] nsk/jdi/VirtualMachine/redefineClasses/redefineclasses026 hangs with Graal in Xcomp mode
vladimir.kozlov at oracle.com
Tue Oct 30 15:51:26 UTC 2018
On 10/30/18 2:04 AM, serguei.spitsyn at oracle.com wrote:
> The Compiler team needs to review this as well, so added hotspot-compiler-dev mailing list.
> On 10/29/18 11:13, Daniil Titov wrote:
>> Please review the change that fixes the issue when the test hangs with Graal and XComp mode on.
>> One of the test cases the test runs is to call com.sun.jdi.VirtualMachine.redefineClasses() while the target VM is
>> suspended. The bytes passed to com.sun.jdi.VirtualMachine.redefineClasses() don't correspond to the reference type
>> (the names do not match) and the test expects NoClassDefFoundError to be thrown.
>> The problem here is that the compiler thread is suspended while "JDWP Transport Listener" thread enters
>> CompileBroker::wait_for_jvmci_completion() method and the code inside CompileBroker::wait_for_jvmci_completion()
>> method falsely assumes that some progress by the compiler thread was made. As a result, it resets the progress wait
>> attempt counter and goes into an endless loop waiting for JVMCI to complete the compilation.
>> Webrev: http://cr.openjdk.java.net/~dtitov/8195627/webrev.01/
>> Issue: https://bugs.openjdk.java.net/browse/JDK-8195627
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