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Date: Mon, 28 May 2007 04:26:15 -0700 (PDT)
From: "Gregory Shimansky (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Closed: (HARMONY-3947) [drlvm][object] Known/proven race
 conditions markup at vm_arrays.cpp":414 at increment_array_copy_counter()
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     [ https://issues.apache.org/jira/browse/HARMONY-3947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gregory Shimansky closed HARMONY-3947.
--------------------------------------


VERIFIED

> [drlvm][object] Known/proven race conditions markup at vm_arrays.cpp":414 at increment_array_copy_counter()
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3947
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3947
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Ilya Leviev
>            Assignee: Gregory Shimansky
>         Attachments: HARMONY-3947_add_markup.patch, SourceViewScreenshot-1.jpg
>
>
> TC report on thread unsafe access that result in race condition that occur during concurrent execution of increment_array_copy_counter functions.
> As issues related to vm statistic data collection in debug mode and it not affect correctness of execution I mark it by special API for prevention of further alarms on this race.
> Write -> Write data-race
> Memory write at "vm_arrays.cpp":414 conflicts with a prior memory write at "vm_arrays.cpp":414
> Stack Trace: 
> Context
> 	Function gc_alloc_fast "gc_for_vm.cpp":178
> 	Function vm_get_gc_thread_local "c_interface.cpp":2334
> 	Function void * vm_new_vector_or_null_using_vtable_and_thread_pointer(int,unsigned int,void *) "vm_arrays.cpp":251
> 	Function rth_aastore "jit_runtime_support.cpp":499
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function hythread_suspend_enable "hythread_ext.h":370
> 	Function Java_java_lang_VMMemoryManager_arrayCopy "java_lang_vmmemorymanager.cpp":48
> 	Function array_copy_jni "jni_utils.cpp":637
> 	Function enum ArrayCopyResult array_copy(struct ManagedObject *,int,struct ManagedObject *,int,int) "vm_arrays.cpp":463
> 	Function increment_array_copy_counter "vm_arrays.cpp":413
> 1st Access
> 	Function hythread_self "hythread.h":465
> 	Function int Jitrino::Jet::rt_h_i32_2_u16(int) "arith_rt.cpp":264
> 	Function vm_get_gc_thread_local "c_interface.cpp":2334
> 	Function is_class_initialized "jit_runtime_support.cpp":702
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function hythread_suspend_enable "hythread_ext.h":370
> 	Function Java_java_lang_VMMemoryManager_arrayCopy "java_lang_vmmemorymanager.cpp":48
> 	Function array_copy_jni "jni_utils.cpp":637
> 	Function enum ArrayCopyResult array_copy(struct ManagedObject *,int,struct ManagedObject *,int,int) "vm_arrays.cpp":463
> 	Function increment_array_copy_counter "vm_arrays.cpp":414
> 	"411"	""	" #ifdef VM_STATS"
> 	"412"	""	" static void increment_array_copy_counter(uint64 &counter)"
> 	"413"	""	" {"
> 	"414"	"*"	"     counter ++;"
> 	"415"	""	" }"
> 	"416"	""	" #endif // VM_STATS"
> 2nd Access
> 	Function gc_alloc_fast "gc_for_vm.cpp":178
> 	Function vm_get_gc_thread_local "c_interface.cpp":2334
> 	Function void * vm_new_vector_or_null_using_vtable_and_thread_pointer(int,unsigned int,void *) "vm_arrays.cpp":251
> 	Function rth_aastore "jit_runtime_support.cpp":499
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function hythread_suspend_enable "hythread_ext.h":370
> 	Function Java_java_lang_VMMemoryManager_arrayCopy "java_lang_vmmemorymanager.cpp":48
> 	Function array_copy_jni "jni_utils.cpp":637
> 	Function enum ArrayCopyResult array_copy(struct ManagedObject *,int,struct ManagedObject *,int,int) "vm_arrays.cpp":463
> 	Function increment_array_copy_counter "vm_arrays.cpp":414
> 	"411"	""	" #ifdef VM_STATS"
> 	"412"	""	" static void increment_array_copy_counter(uint64 &counter)"
> 	"413"	""	" {"
> 	"414"	"*"	"     counter ++;"
> 	"415"	""	" }"
> 	"416"	""	" #endif // VM_STATS"
> See also Source View screenshots.

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