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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4170) [drlvm][gc_gen][tc] Race condition at "gc_thread.h":(135-154) at allocator_init_free_block() and alloc_context_reset() functions
Date Thu, 14 Jun 2007 13:26:34 GMT
[drlvm][gc_gen][tc] Race condition at "gc_thread.h":(135-154) at allocator_init_free_block()
and alloc_context_reset() functions
--------------------------------------------------------------------------------------------------------------------------------

                 Key: HARMONY-4170
                 URL: https://issues.apache.org/jira/browse/HARMONY-4170
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Leviev
         Attachments: SourceViewScreenshot-1.jpg

Race condition at "gc_thread.h":(135-154) at allocator_init_free_block() and alloc_context_reset()
functions

TC report on thread unsafe access that result in race condition that occur during concurrent
execution of allocator_init_free_block() and alloc_context_reset() functions

if it not affect correctness of execution I will mark it by special API for prevention of
further alarms on this race. 


Write -> Write data-race
Memory write at "gc_thread.h":154 conflicts with a prior memory write at "gc_thread.h":135


Stack Trace:

Context
	Function void interpreter(struct StackFrame &) "interpreter.cpp":2931
	Function Opcode_INVOKESTATIC "interpreter.cpp":2104
	Function interpreterInvokeStatic "interpreter.cpp":3312
	Function void interpreterInvokeStaticNative(struct StackFrame &,struct StackFrame &,struct
Method *) "interp_native_ia32.cpp":358
	Function invokeJNI "interp_native_ia32.cpp":49
	Function Java_java_lang_VMMemoryManager_runGC "java_lang_vmmemorymanager.cpp":138
	Function gc_force_gc "gc_for_vm.cpp":138
	Function void gc_reclaim_heap(struct GC *,unsigned int) "gc_common.cpp":300
	Function void gc_reset_mutator_context(struct GC *) "mutator.cpp":102
	Function void alloc_context_reset(struct Allocator *) "gc_thread.h":142

Definition
	Function hythread_create_with_group "thread_native_basic.c":136
	Function os_thread_create "os_thread.c":37
	Function _beginthreadex "threadex.c":145
	Function EntryPoint "dllcrt0.c":323
	Function threadstartex "threadex.c":241
	Function thread_start_proc "thread_native_basic.c":711
	Function wrapper_proc "thread_java_basic.c":82
	Function vm_attach "thread_generic.cpp":266
	Function gc_thread_init "gc_for_vm.cpp":152
	Function void mutator_initialize(struct GC *,void *) "mutator.cpp":30

1st Access
	Function void interpreter(struct StackFrame &) "interpreter.cpp":2844
	Function Opcode_NEW "interpreter.cpp":1254
	Function struct ManagedObject * class_alloc_new_object(struct Class *) "jit_runtime_support.cpp":2589
	Function struct ManagedObject * Class::allocate_instance(void) "class.cpp":478
	Function void * vm_alloc_and_report_ti(unsigned int,unsigned int,void *,struct Class *) "jvmti_event.cpp":1359
	Function gc_alloc "mutator_alloc.cpp":79
	Function void * nos_alloc(unsigned int,struct Allocator *) "gen.cpp":274
	Function void * fspace_alloc(unsigned int,struct Allocator *) "fspace_alloc.cpp":61
	Function fspace_alloc_block "fspace_alloc.cpp":40
	Function void allocator_init_free_block(struct Allocator *,struct Block_Header *) "gc_thread.h":135

	"135"	"*"	"     allocator->end = alloc_block->ceiling;"
	"136"	""	"     allocator->alloc_block = (Block*)alloc_block; "


2nd Access
	Function void interpreter(struct StackFrame &) "interpreter.cpp":2931
	Function Opcode_INVOKESTATIC "interpreter.cpp":2104
	Function interpreterInvokeStatic "interpreter.cpp":3312
	Function void interpreterInvokeStaticNative(struct StackFrame &,struct StackFrame &,struct
Method *) "interp_native_ia32.cpp":358
	Function invokeJNI "interp_native_ia32.cpp":49
	Function Java_java_lang_VMMemoryManager_runGC "java_lang_vmmemorymanager.cpp":138
	Function gc_force_gc "gc_for_vm.cpp":138
	Function void gc_reclaim_heap(struct GC *,unsigned int) "gc_common.cpp":300
	Function void gc_reset_mutator_context(struct GC *) "mutator.cpp":102
	Function void alloc_context_reset(struct Allocator *) "gc_thread.h":154

	"152"	""	"    allocator->free = NULL;"
	"153"	""	"    allocator->ceiling = NULL;"
	"154"	"*"	"    allocator->end = NULL;"


See also Source View screenshots. 



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