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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3978) [drlvm][gc_gen] Race conditions at "gc_common.h":175 and collector_alloc.h":76
Date Fri, 25 May 2007 10:25:16 GMT
[drlvm][gc_gen] Race conditions at "gc_common.h":175 and collector_alloc.h":76
------------------------------------------------------------------------------

                 Key: HARMONY-3978
                 URL: https://issues.apache.org/jira/browse/HARMONY-3978
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Leviev




TC report on thread unsafe access that result in race condition that occur during concurrent
execution of collector_forward_object and write_slot 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_common.h":175 conflicts with a prior memory write at "collector_alloc.h":76


Stack Trace: 

Context
	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 collector_thread_func "collector.cpp":181
	Function void nongen_forward_pool(struct Collector *) "fspace_nongen_forward_pool.cpp":220
	Function collector_trace_rootsets "fspace_nongen_forward_pool.cpp":178
	Function trace_object "fspace_nongen_forward_pool.cpp":123
	Function forward_object "fspace_nongen_forward_pool.cpp":115
	Function void write_slot(struct Partial_Reveal_Object * *,struct Partial_Reveal_Object *)
"gc_common.h":175


1st Access
	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 collector_thread_func "collector.cpp":181
	Function void nongen_forward_pool(struct Collector *) "fspace_nongen_forward_pool.cpp":220
	Function collector_trace_rootsets "fspace_nongen_forward_pool.cpp":178
	Function trace_object "fspace_nongen_forward_pool.cpp":128
	Function forward_object "fspace_nongen_forward_pool.cpp":94
	Function struct Partial_Reveal_Object * collector_forward_object(struct Collector *,struct
Partial_Reveal_Object *) "collector_alloc.h":76


	"74"	""	"     oi = trace_forward_process_hashcode(p_targ_obj, p_obj ,oi, size);"
	"75"	""	"   }else{"
	"76"	"*"	"     memcpy(p_targ_obj, p_obj, size);    "
	"77"	""	"   }"
	"78"	""	" #else"



2nd Access
	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 collector_thread_func "collector.cpp":181
	Function void nongen_forward_pool(struct Collector *) "fspace_nongen_forward_pool.cpp":220
	Function collector_trace_rootsets "fspace_nongen_forward_pool.cpp":178
	Function trace_object "fspace_nongen_forward_pool.cpp":123
	Function forward_object "fspace_nongen_forward_pool.cpp":115
	Function void write_slot(struct Partial_Reveal_Object * *,struct Partial_Reveal_Object *)
"gc_common.h":175


	"173"	""	" "
	"174"	""	" FORCE_INLINE void write_slot(REF *p_slot, Partial_Reveal_Object *p_obj)"
	"175"	"*"	" {  *p_slot = obj_ptr_to_ref(p_obj); }"
	"176"	""	" "
	"177"	""	" "




See also Source View screenshots.



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