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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4042) [drlvm][thread][tc] Race condition at thread_java_monitors.c":327 and thread_native_suspend.c":301
Date Tue, 05 Jun 2007 10:19:26 GMT
[drlvm][thread][tc] Race condition at thread_java_monitors.c":327 and thread_native_suspend.c":301

---------------------------------------------------------------------------------------------------

                 Key: HARMONY-4042
                 URL: https://issues.apache.org/jira/browse/HARMONY-4042
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Leviev


Race condition at thread_java_monitors.c":327 and thread_native_suspend.c":301 

TC report on thread unsafe access to "state" field that result in race condition that occur
during concurrent execution of hythread_resume and jthread_monitor_timed_wait functions. 

Write -> Write data-race	
Memory write at "thread_java_monitors.c":327 conflicts with a prior memory write at "thread_native_suspend.c":301



Stack Trace: 

Context
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function hythread_self "hythread.h":465
	Function int Jitrino::Jet::rt_h_i32_2_i16(int) "arith_rt.cpp":263
	Function hythread_self "hythread.h":465
	Function __int64 Jitrino::Jet::rt_h_i32_2_i64(int) "arith_rt.cpp":265
	Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":361
	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_VMThreadManager_wait "java_lang_vmthreadmanager.cpp":202
	Function jthread_monitor_timed_wait "thread_java_monitors.c":291



1st Access
	Function vm_get_gc_thread_local "c_interface.cpp":2414
	Function gc_alloc_fast "mutator_alloc.cpp":120
	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 rth_get_interface_vtable "jit_runtime_support.cpp":651
	Function rth_update_checkcast_stats "jit_runtime_support.cpp":377
	Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":343
	Function unreserve_lock "thread_native_thin_monitor.c":210
	Function hythread_resume "thread_native_suspend.c":301

	"300"	""	"     hymutex_lock(&thread->mutex);"
	"301"	"*"	"     thread->state &= ~TM_THREAD_STATE_SUSPENDED;"
	"302"	""	"     hymutex_unlock(&thread->mutex);"



2nd Access
	Function m2n_free_local_handles "m2n_ia32.cpp":268
	Function hythread_self "hythread.h":465
	Function int Jitrino::Jet::rt_h_i32_2_i16(int) "arith_rt.cpp":263
	Function hythread_self "hythread.h":465
	Function __int64 Jitrino::Jet::rt_h_i32_2_i64(int) "arith_rt.cpp":265
	Function hythread_thin_monitor_try_enter "thread_native_thin_monitor.c":361
	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_VMThreadManager_wait "java_lang_vmthreadmanager.cpp":202
	Function jthread_monitor_timed_wait "thread_java_monitors.c":327



	"326"	""	"     tm_native_thread = hythread_self();"
	"327"	"*"	"     tm_native_thread->state &= ~TM_THREAD_STATE_RUNNABLE;"
	"328"	""	"     tm_native_thread->state |= TM_THREAD_STATE_WAITING |"
	"329"	""	"             TM_THREAD_STATE_IN_MONITOR_WAIT;"



See also Source View screenshot


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





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