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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5843) [drlvm][gc] class unloading is unstable
Date Tue, 27 May 2008 04:33:57 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12599957#action_12599957

Alexey Varlamov commented on HARMONY-5843:

This is a suite for checking conformance to lazy class loading/resolution behaviour. Occasionally
it puts a strain on CU facilities, thus I added the StressTest to reveal instabilities there.

> [drlvm][gc] class unloading is unstable
> ---------------------------------------
>                 Key: HARMONY-5843
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5843
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Alexey Varlamov
>            Assignee: Chunrong Lai
> On class-unloading scenarious, DRLVM easily hits a bunch of asserts in gc_gen. Most typical
asserts are:
>     [junit] Assertion failed: obj && obj->vt_raw, file c:\users\avarlamo\trunk\working_vm\vm\gc_gen\src\common\gc_for_class.h,
line 207
>     [junit] Assertion failed: address_belongs_to_gc_heap(addr, gc), file c:\users\avarlamo\trunk\working_vm\vm\gc_gen\src\thread\../gen/gen.h,
line 152
>     [junit] Assertion failed: vm_object_size(obj) != 0, file c:\users\avarlamo\trunk\working_vm\vm\gc_gen\src\common\gc_block.h,
line 146
> These asserts fire intermittently, may be reproduced in any mode including interpreter
and on any platform (yet on different machines a particular assert happens more often than
> To reproduce, run lazy.test suite:
> working_vm$ ant lazy.test
> For convenience, there is standalone launcher org.apache.harmony.vm.test.lazyresolution.StressTest
which can vary stress load, e.g.:
> working_vm$ cd build\windows_x86_msvc_debug\tests\lazy.tests\classes
> classes$ java -cp .;junit.jar -Dlazy.test.iterations=100 -Dlazy.test.threads=10 org.apache.harmony.vm.test.lazyresolution.StressTest

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