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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-3858) [drlvm][jit] Known/proven race conditions markup at \vm\vmcore\src\jit\jit_runtime_support.cpp(L367, L369)
Date Mon, 14 May 2007 16:45:16 GMT
[drlvm][jit] Known/proven race conditions markup at \vm\vmcore\src\jit\jit_runtime_support.cpp(L367,
L369)
----------------------------------------------------------------------------------------------------------

                 Key: HARMONY-3858
                 URL: https://issues.apache.org/jira/browse/HARMONY-3858
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Leviev
            Priority: Minor
         Attachments: HARMONY-3858_add_markup.patch

There are thread unsafe access that result in race condition that occur during concurrent
execution of rth_update_checkcast_stats function 

If it not affect correctness of execution I have marked it by special API for prevention of
further alarms on this race. 


Write -> Write data-race	
Memory write at "jit_runtime_support.cpp":367 conflicts with a prior memory write at "jit_runtime_support.cpp":367



Stack Traces1: 

Context
	Function vm_invoke_native_array_stub "ini_ia32.cpp":76
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":341
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function jthread_monitor_enter "thread_java_monitors.c":157
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":366



1st Access
	Function void JIT_execute_method_default(void *,struct _jmethodID *,union jvalue *,union
jvalue *) "ini_ia32.cpp":199
	Function vm_invoke_native_array_stub "ini_ia32.cpp":76
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":341
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":367

2nd Access
	Function vm_invoke_native_array_stub "ini_ia32.cpp":76
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":341
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function jthread_monitor_enter "thread_java_monitors.c":157
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":367


""	"365"	""	" static void rth_update_checkcast_stats(ManagedObject* o, Class* super)"
"0x890F0"	"366"	""	" {"
"0x89107"	"367"	"*"	"     VM_Statistics::get_vm_stats().num_checkcast ++;"
"0x8912A"	"368"	""	"     if (o == (ManagedObject*)VM_Global_State::loader_env->managed_null)
{"
"0x8913B"	"369"	"*"	"         VM_Statistics::get_vm_stats().num_checkcast_null++;"
"0x8915E"	"370"	""	"     } else {"
"0x89160"	"371"	""	"         if (o->vt()->clss == super)"




Write -> Write data-race	
Memory write at "jit_runtime_support.cpp":369 conflicts with a prior memory write at "jit_runtime_support.cpp":369


Stack Traces 2: 

Context
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	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 is_class_initialized "jit_runtime_support.cpp":702
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_disable "hythread_ext.h":421
	Function m2n_pop_local_handles "m2n_ia32.cpp":257
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":366


1st Access
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_self "hythread.h":465
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function hythread_self "hythread.h":465
	Function vm_get_gc_thread_local "c_interface.cpp":2334
	Function gc_alloc_fast "gc_for_vm.cpp":178
	Function rth_get_interface_vtable "jit_runtime_support.cpp":651
	Function hythread_self "hythread.h":465
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":369

2nd Access
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	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 is_class_initialized "jit_runtime_support.cpp":702
	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
	Function hythread_suspend_disable "hythread_ext.h":421
	Function m2n_pop_local_handles "m2n_ia32.cpp":257
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":369

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