[jira] Commented: (HARMONY-5843) [drlvm][gc] class unloading is unstable

["Chunrong Lai (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HARMONY-5843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12601978#action_12601978 ] 

Chunrong Lai commented on HARMONY-5843:
---------------------------------------


 An update is that I find the cause of this assertion failure. I see perfoming class unloading breaks one assumption of a specific GC algorithm (MAJOR_MOVE_COMPACT). I will need some time to figure out a solution for that.

> [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 others).
> 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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