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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4071) [drlvm][classloader][tc] Known/proven race conditions markup at class.h:(1781/1782) at instance_allocated function
Date Wed, 06 Jun 2007 12:57:25 GMT
[drlvm][classloader][tc] Known/proven race conditions markup at class.h:(1781/1782) at instance_allocated
function
------------------------------------------------------------------------------------------------------------------

                 Key: HARMONY-4071
                 URL: https://issues.apache.org/jira/browse/HARMONY-4071
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Leviev


Known/proven race conditions markup at class.h:(1781/1782) at instance_allocated function

TC report on thread unsafe access that result in race condition that occur during concurrent
execution of instance_allocated function. 


As issues related to vm statistic data collection in debug mode I have marked it by special
API for prevention of further alarms on this races. 

data-races

1)Write -> Write data-race	
Memory write at "class.h":1781 conflicts with a prior memory write at "class.h":1781


2)Write -> Write data-race
Memory write at "class.h":1782 conflicts with a prior memory write at "class.h":1782


Stack Trace: 
Context
	Function vm_get_gc_thread_local "c_interface.cpp":2414
	Function gc_alloc_fast "mutator_alloc.cpp":120
	Function struct ManagedObject * struct_Class_to_java_lang_Class(struct Class *) "class.cpp":778
	Function unsigned int class_is_subtype(struct Class *,struct Class *) "jit_runtime_support.cpp":3199
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_enable "hythread_ext.h":373
	Function Java_java_lang_VMMemoryManager_clone "java_lang_vmmemorymanager.cpp":59
	Function object_clone "object_generic.cpp":148
	Function struct ManagedObject * Class::allocate_instance(void) "class.cpp":486
	Function void Class::instance_allocated(unsigned int) "class.h":1780

1st Access
	Function gc_alloc_fast "mutator_alloc.cpp":120
	Function is_class_initialized "jit_runtime_support.cpp":702
	Function struct ManagedObject * struct_Class_to_java_lang_Class(struct Class *) "class.cpp":778
	Function unsigned int class_is_subtype(struct Class *,struct Class *) "jit_runtime_support.cpp":3199
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_enable "hythread_ext.h":373
	Function Java_java_lang_VMMemoryManager_clone "java_lang_vmmemorymanager.cpp":59
	Function object_clone "object_generic.cpp":148
	Function struct ManagedObject * Class::allocate_instance(void) "class.cpp":486
	Function void Class::instance_allocated(unsigned int) "class.h":1781


	"1,779"	""	"     * @param[in] size - a size of an allocated instance*/"
	"1,780"	""	"     void instance_allocated(unsigned size) {"
	"1,781"	"*"	"         m_num_allocations++;"
	"1,782"	"*"	"         m_num_bytes_allocated += size;"
	"1,783"	""	"     }"
	"1,784"	""	" "



2nd Access
	Function vm_get_gc_thread_local "c_interface.cpp":2414
	Function gc_alloc_fast "mutator_alloc.cpp":120
	Function struct ManagedObject * struct_Class_to_java_lang_Class(struct Class *) "class.cpp":778
	Function unsigned int class_is_subtype(struct Class *,struct Class *) "jit_runtime_support.cpp":3199
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_enable "hythread_ext.h":373
	Function Java_java_lang_VMMemoryManager_clone "java_lang_vmmemorymanager.cpp":59
	Function object_clone "object_generic.cpp":148
	Function struct ManagedObject * Class::allocate_instance(void) "class.cpp":486
	Function void Class::instance_allocated(unsigned int) "class.h":1781


	"1,779"	""	"     * @param[in] size - a size of an allocated instance*/"
	"1,780"	""	"     void instance_allocated(unsigned size) {"
	"1,781"	"*"	"         m_num_allocations++;"
	"1,782"	"*"	"         m_num_bytes_allocated += size;"
	"1,783"	""	"     }"
	"1,784"	""	" "




See also Source View screenshot





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