RFR (XXS) 8066292: Test java/nio/file/Files/CheckPermissions.java triggers stack overflow with -server -Xcomp

Dean Long dean.long at oracle.com
Wed Feb 24 00:28:55 UTC 2016

On 2/23/2016 2:03 PM, Vladimir Kozlov wrote:
> On 2/22/16 2:31 PM, Dean Long wrote:
>> https://bugs.openjdk.java.net/browse/JDK-8066292
>> http://cr.openjdk.java.net/~dlong/8066292/webrev/
>> With -Xcomp, a cycle between compile requests and class loading can 
>> cause infinite recursion resulting in
>> StackOverflowError's that are silently ignored.  To break the cycle, 
>> this changeset removes the ancient call to
>> Method::load_signature_classes() for C2.  This call is no longer needed.
> "This call is no longer needed" because ...? Why it is not needed? C2 
> can't compile methods if these classes are not loaded.

That was my understanding from internal discussions.  Chris or John, can 
you chime in here?

I know that C2 creates placeholder classes if a class isn't loaded. Can 
you point me to where we fail the compilation is signature classes are 
not loaded?


> Thanks,
> Vladimir
>> Tested in RBT with --test
>> vm.compiler.testlist,hotspot/test/:hotspot_compiler_closed,hotspot/test/:hotspot_compiler_1,hotspot/test/:hotspot_compiler_2,hotspot/test/:hotspot_compiler_3 
>> dl

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