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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-3979) [drlvm][class_support] Race conditions at "string_pool.cpp":319
Date Fri, 25 May 2007 10:41:16 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3979?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ilya Leviev updated HARMONY-3979:
---------------------------------

    Attachment: SourceViewScreenshot-1.jpg

> [drlvm][class_support] Race conditions at "string_pool.cpp":319 
> ----------------------------------------------------------------
>
>                 Key: HARMONY-3979
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3979
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Ilya Leviev
>         Attachments: SourceViewScreenshot-1.jpg
>
>
> TC report on thread unsafe access that result in race condition that occur during concurrent
execution of register_interned_string function
> 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 "string_pool.cpp":319 conflicts with a prior memory write at "string_pool.cpp":319
> Stack Trace: 
> Context
> 	Function m2n_pop_local_handles "m2n_ia32.cpp":257
> 	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 hythread_suspend_enable "hythread_ext.h":370
> 	Function Java_java_lang_VMClassRegistry_getName "java_lang_vmclassregistry.cpp":290
> 	Function struct _jobject * String_to_interned_jstring(struct String *) "vm_strings.cpp":585
> 	Function struct ManagedObject * vm_instantiate_cp_string_resolved(struct String *) "vm_strings.cpp":563
> 	Function struct ManagedObject * String_Pool::intern(struct String *) "string_pool.cpp":366
> 	Function void String_Pool::register_interned_string(struct String *) "string_pool.cpp":299
> 1st Access
> 	Function m2n_free_local_handles "m2n_ia32.cpp":268
> 	Function is_class_initialized "jit_runtime_support.cpp":702
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function class VM_thread * get_thread_ptr_stub(void) "thread_manager.cpp":138
> 	Function rth_ldc_ref_helper "jit_runtime_support.cpp":163
> 	Function struct ManagedObject * vm_instantiate_cp_string_slow(struct Class *,unsigned
int) "vm_strings.cpp":615
> 	Function struct ManagedObject * vm_instantiate_cp_string_resolved(struct String *) "vm_strings.cpp":563
> 	Function struct ManagedObject * String_Pool::intern(struct String *) "string_pool.cpp":366
> 	Function void String_Pool::register_interned_string(struct String *) "string_pool.cpp":319
> 	"316"	""	"         MemoryWriteBarrier();"
> 	"317"	""	"         local_current_interned->free_slot++;"
> 	"318"	""	"     } else {"
> 	"319"	"*"	"         current_interned->free_slot++;"
> 	"320"	""	"     }"
> 	"321"	""	" }"
> 2nd Access
> 	Function m2n_pop_local_handles "m2n_ia32.cpp":257
> 	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 hythread_suspend_enable "hythread_ext.h":370
> 	Function Java_java_lang_VMClassRegistry_getName "java_lang_vmclassregistry.cpp":290
> 	Function struct _jobject * String_to_interned_jstring(struct String *) "vm_strings.cpp":585
> 	Function struct ManagedObject * vm_instantiate_cp_string_resolved(struct String *) "vm_strings.cpp":563
> 	Function struct ManagedObject * String_Pool::intern(struct String *) "string_pool.cpp":366
> 	Function void String_Pool::register_interned_string(struct String *) "string_pool.cpp":319
> 	"316"	""	"         MemoryWriteBarrier();"
> 	"317"	""	"         local_current_interned->free_slot++;"
> 	"318"	""	"     } else {"
> 	"319"	"*"	"         current_interned->free_slot++;"
> 	"320"	""	"     }"
> 	"321"	""	" }"
> See also Source View screenshots.

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