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From "Ilya Leviev (JIRA)" <j...@apache.org>
Subject [jira] Reopened: (HARMONY-3977) [drlvm][gc_gen] Race conditions at "gc_for_vm.cpp":300 at gc_clear_mutator_block_flag function
Date Mon, 28 May 2007 15:50:16 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-3977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ilya Leviev reopened HARMONY-3977:
----------------------------------


patch that mark race by special API for prevention of further alarms should be applied

> [drlvm][gc_gen] Race conditions at "gc_for_vm.cpp":300 at gc_clear_mutator_block_flag
function
> ----------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-3977
>                 URL: https://issues.apache.org/jira/browse/HARMONY-3977
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Ilya Leviev
>            Assignee: Xiao-Feng Li
>         Attachments: HARMONY-3977_add_markup.patch, SourceViewScreenshot-1.jpg
>
>
> TC report on thread unsafe access that result in race condition that occur during concurrent
execution of gc_clear_mutator_block_flag 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 "gc_for_vm.cpp":300 conflicts with a prior memory write at "gc_for_vm.cpp":300
> Stack Trace: 
> Context
> 	Function hythread_create "thread_native_basic.c":165
> 	Function hythread_create_with_group "thread_native_basic.c":136
> 	Function os_thread_create "os_thread.c":37
> 	Function _beginthreadex "threadex.c":145
> 	Function EntryPoint "dllcrt0.c":323
> 	Function threadstartex "threadex.c":241
> 	Function thread_start_proc "thread_native_basic.c":711
> 	Function finalizer_thread_func "finalizer_thread.cpp":266
> 	Function void vm_heavy_finalizer_resume_mutator(void) "finalizer_thread.cpp":318
> 	Function gc_clear_mutator_block_flag "gc_for_vm.cpp":298
> 1st Access
> 	Function hythread_create "thread_native_basic.c":165
> 	Function hythread_create_with_group "thread_native_basic.c":136
> 	Function os_thread_create "os_thread.c":37
> 	Function _beginthreadex "threadex.c":145
> 	Function EntryPoint "dllcrt0.c":323
> 	Function threadstartex "threadex.c":241
> 	Function thread_start_proc "thread_native_basic.c":711
> 	Function finalizer_thread_func "finalizer_thread.cpp":266
> 	Function void vm_heavy_finalizer_resume_mutator(void) "finalizer_thread.cpp":318
> 	Function gc_clear_mutator_block_flag "gc_for_vm.cpp":300
> 	"297"	""	" Boolean gc_clear_mutator_block_flag()"
> 	"298"	""	" {"
> 	"299"	""	"   Boolean old_flag = mutator_need_block;"
> 	"300"	"*"	"   mutator_need_block = FALSE;"
> 	"301"	""	"   return old_flag;"
> 2nd Access
> 	Function hythread_create "thread_native_basic.c":165
> 	Function hythread_create_with_group "thread_native_basic.c":136
> 	Function os_thread_create "os_thread.c":37
> 	Function _beginthreadex "threadex.c":145
> 	Function EntryPoint "dllcrt0.c":323
> 	Function threadstartex "threadex.c":241
> 	Function thread_start_proc "thread_native_basic.c":711
> 	Function finalizer_thread_func "finalizer_thread.cpp":266
> 	Function void vm_heavy_finalizer_resume_mutator(void) "finalizer_thread.cpp":318
> 	Function gc_clear_mutator_block_flag "gc_for_vm.cpp":300
> 	"297"	""	" Boolean gc_clear_mutator_block_flag()"
> 	"298"	""	" {"
> 	"299"	""	"   Boolean old_flag = mutator_need_block;"
> 	"300"	"*"	"   mutator_need_block = FALSE;"
> 	"301"	""	"   return old_flag;"
> See also Source View screenshots.

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