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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HARMONY-3897) [drlvm][thread][tc] Race condition at thread_java_basic.c:531 and thread_native_suspend.c":189
Date Fri, 28 Dec 2007 13:09:44 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ilya Leviev resolved HARMONY-3897.
----------------------------------

    Resolution: Fixed

> [drlvm][thread][tc] Race condition at thread_java_basic.c:531 and thread_native_suspend.c":189
> ----------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3897
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3897
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Ilya Leviev
>            Assignee: weldon washburn
>         Attachments: SourceViewScreenshot-1.jpg
>
>
> TC report on thread unsafe access to "state" field that result in race condition that
occur during concurrent execution of jthread_sleep and wait_safe_region_event functions.
> Write -> Write data-race	
> Memory write at "thread_native_suspend.c":189 conflicts with a prior memory write at
"thread_java_basic.c":531
> Stack Trace: 
> Context
> 	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 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":323
> 	Function unreserve_lock "thread_native_thin_monitor.c":162
> 	Function hythread_suspend_other "thread_native_suspend.c":255
> 	Function wait_safe_region_event "thread_native_suspend.c":169
> 1st Access
> 	Function __int64 Jitrino::Jet::rt_h_i64_a(__int64,__int64,enum JavaByteCodes) "arith_rt.cpp":218
> 	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 int Jitrino::Jet::rt_h_lcmp(__int64,__int64) "arith_rt.cpp":69
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function hythread_suspend_enable "hythread_ext.h":370
> 	Function Java_java_lang_VMThreadManager_sleep "java_lang_vmthreadmanager.cpp":140
> 	Function jthread_sleep "thread_java_basic.c":531
> "530"	""	" "
> "531"	"*"	"     tm_native_thread->state |= TM_THREAD_STATE_RUNNABLE;"
> "532"	""	"     return status;"
> 2nd 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 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":323
> 	Function unreserve_lock "thread_native_thin_monitor.c":162
> 	Function hythread_suspend_other "thread_native_suspend.c":255
> 	Function wait_safe_region_event "thread_native_suspend.c":189
> "187"	""	"            thread, thread->suspend_count, thread->request));"
> "188"	""	"     hymutex_lock(&thread->mutex);"
> "189"	"*"	"     thread->state |= TM_THREAD_STATE_SUSPENDED;"
> "190"	""	"     hymutex_unlock(&thread->mutex);"
> "191"	""	"     return TM_ERROR_NONE;"
> 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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