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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3949) [drlvm][class_support] Known/proven race conditions markup at "method_lookup.cpp":234 at CodeChunkInfo * Method_Lookup_Table::find(void *,bool)
Date Wed, 23 May 2007 14:41:16 GMT
[drlvm][class_support] Known/proven race conditions markup at "method_lookup.cpp":234 at CodeChunkInfo
* Method_Lookup_Table::find(void *,bool)
-----------------------------------------------------------------------------------------------------------------------------------------------

                 Key: HARMONY-3949
                 URL: https://issues.apache.org/jira/browse/HARMONY-3949
             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 find function at "method_lookup.cpp":234.

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 "method_lookup.cpp":234 conflicts with a prior memory write at "method_lookup.cpp":234


Stack Trace: 

Context
	Function is_class_initialized "jit_runtime_support.cpp":702
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_pop_local_handles "m2n_ia32.cpp":257
	Function vm_get_gc_thread_local "c_interface.cpp":2334
	Function gc_alloc_fast "gc_for_vm.cpp":178
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_enable "hythread_ext.h":370
	Function Java_org_apache_harmony_vm_VMStack_getStackTrace "org_apache_harmony_vm_vmstack.cpp":378
	Function get_file_and_line "stack_trace.cpp":62
	Function class CodeChunkInfo * Method_Lookup_Table::find(void *,bool) "method_lookup.cpp":215



1st Access
	Function vm_get_gc_thread_local "c_interface.cpp":2334
	Function gc_alloc_fast "gc_for_vm.cpp":178
	Function vm_get_gc_thread_local "c_interface.cpp":2334
	Function gc_alloc_fast "gc_for_vm.cpp":178
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_enable "hythread_ext.h":370
	Function Java_org_apache_harmony_vm_VMStack_getCallerClass "org_apache_harmony_vm_vmstack.cpp":59
	Function st_get_frame "stack_trace.cpp":137
	Function void si_goto_previous(struct StackIterator *,bool) "stack_iterator_ia32.cpp":321
	Function class CodeChunkInfo * Method_Lookup_Table::find(void *,bool) "method_lookup.cpp":234

	"232"	""	"         if ((addr >= guess_start) && (addr < guess_end)) {"
	"233"	""	" #ifdef VM_STATS"

	"234"	"*"	"             VM_Statistics::get_vm_stats().num_method_lookup_cache_hit++;"

	"235"	""	" #endif //VM_STATS"
	"236"	""	"             return guess;"



2nd Access
	Function is_class_initialized "jit_runtime_support.cpp":702
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_pop_local_handles "m2n_ia32.cpp":257
	Function vm_get_gc_thread_local "c_interface.cpp":2334
	Function gc_alloc_fast "gc_for_vm.cpp":178
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_enable "hythread_ext.h":370
	Function Java_org_apache_harmony_vm_VMStack_getStackTrace "org_apache_harmony_vm_vmstack.cpp":378
	Function get_file_and_line "stack_trace.cpp":62
	Function class CodeChunkInfo * Method_Lookup_Table::find(void *,bool) "method_lookup.cpp":234


	"232"	""	"         if ((addr >= guess_start) && (addr < guess_end)) {"
	"233"	""	" #ifdef VM_STATS"

	"234"	"*"	"             VM_Statistics::get_vm_stats().num_method_lookup_cache_hit++;"

	"235"	""	" #endif //VM_STATS"
	"236"	""	"             return guess;"



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