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From "Travis Vitek (JIRA)" <j...@apache.org>
Subject [jira] Updated: (STDCXX-449) [ITC/Linux] std::string Write -> Read data-race errors
Date Thu, 27 Mar 2008 23:06:24 GMT

     [ https://issues.apache.org/jira/browse/STDCXX-449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Travis Vitek updated STDCXX-449:
--------------------------------

    Attachment: _tcheck.h

Well, as I pointed out above, the only way I see to deal with this is to use the thread checker
notify library to tell the thread checker that things are okay. If this is the route that
we decide to go, then the attached file {{include/rw/_tcheck.h}} may be useful.

> [ITC/Linux] std::string Write -> Read data-race errors
> ------------------------------------------------------
>
>                 Key: STDCXX-449
>                 URL: https://issues.apache.org/jira/browse/STDCXX-449
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 21. Strings
>    Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
>         Environment: Intel Thread Checker 3.1 on Red Hat Enterprise Linux AS release
4 (Nahant Update 4)
>            Reporter: Martin Sebor
>            Assignee: Travis Vitek
>            Priority: Minor
>             Fix For: 4.3
>
>         Attachments: 21.string.cons.mt.itc-report.html, _tcheck.h
>
>
> Running the Intel Thread Checker on the string thread safety tests 21.string.cons.mt
and 21.string.push_back.mt produces errors suggesting potential thread safety problems even
though the tests run successfully to completion. See the text output below:
> {noformat}
> $ tcheck_cl -w 200 ./21.string.cons.mt --nloops=100 --nthreads=2
> Intel(R) Thread Checker 3.1 command line instrumentation driver (24400)
> Copyright (c) 2007 Intel Corporation. All rights reserved.
> Building project
> Running:  /build/sebor/stdcxx-icc-9.1_042-15s/tests/21.string.cons.mt --nloops=100 --nthreads=2
> # INFO (S1) (10 lines):
> # TEXT: 
> # COMPILER: Intel C++, __INTEL_COMPILER = 910, __INTEL_COMPILER_BUILD_DATE = 20060706,
__EDG_VERSION__ = 306
> # ENVIRONMENT: i386 running linux-elf 2.4.20 with glibc 2.3
> # FILE: 21.string.cons.mt.cpp
> # COMPILED: Jun 13 2007, 13:00:49
> # COMMENT: thread safety
> ############################################################
> # CLAUSE: lib.string.cons
> # INFO (S1) (3 lines):
> # TEXT: testing std::string with 2 threads, 100 iterations each
> # CLAUSE: lib.string.cons
> # INFO (S1) (3 lines):
> # TEXT: testing std::wstring with 2 threads, 100 iterations each
> # CLAUSE: lib.string.cons
> # +-----------------------+----------+----------+----------+
> # | DIAGNOSTIC            |  ACTIVE  |   TOTAL  | INACTIVE |
> # +-----------------------+----------+----------+----------+
> # | (S1) INFO             |        3 |        3 |       0% |
> # | (S7) ASSERTION        |        0 |       16 |     100% |
> # +-----------------------+----------+----------+----------+
> Application finished
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |ID |Short Description    |Severity   |Cou|Context[Best]      |Description          
                                                                      |1st Access[Best]  
 |2nd Access[Best]      |
> |   |                     |Name       |nt |                   |                     
                                                                      |                  
 |                      |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |1  |Write -> Read        |Error      |128|[21.string.cons.mt,|Memory read at "_strref.h":159
conflicts with a prior memory write at [21.string.cons.mt,   |[21.string.cons.mt, |"_strref.h":159
      |
> |   |data-race            |           |   |0xadf0]            |0x3475f] (flow dependence)
                                                                 |0x3475f]            |  
                   |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |2  |Read -> Write        |Error      |5  |[21.string.cons.mt,|Memory write at [21.string.cons.mt,
0x3475f] conflicts with a prior memory read at          |"_strref.h":159     |[21.string.cons.mt,
  |
> |   |data-race            |           |   |0x34755]           |"_strref.h":159 (anti
dependence)                                                           |                  
 |0x3475f]              |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |3  |Thread termination   |Information|1  |Whole Program 1    |Thread termination at
"thread.cpp":76 - includes stack allocation of 10.004 MB and use of   |"thread.cpp":76   
 |"thread.cpp":76       |
> |   |                     |           |   |                   |4.516 KB             
                                                                      |                  
 |                      |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |4  |Thread termination   |Information|1  |Whole Program 2    |Thread termination at
"thread.cpp":76 - includes stack allocation of 10.004 MB and use of   |"thread.cpp":76   
 |"thread.cpp":76       |
> |   |                     |           |   |                   |4.516 KB             
                                                                      |                  
 |                      |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |5  |Read -> Write        |Error      |7  |[21.string.cons.mt,|Memory write at [21.string.cons.mt,
0x3475f] conflicts with a prior memory read at          |"_strref.h":159     |[21.string.cons.mt,
  |
> |   |data-race            |           |   |0x34755]           |"_strref.h":159 (anti
dependence)                                                           |                  
 |0x3475f]              |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |6  |Thread termination   |Information|1  |Whole Program 3    |Thread termination at
"thread.cpp":76 - includes stack allocation of 10.004 MB and use of   |"thread.cpp":76   
 |"thread.cpp":76       |
> |   |                     |           |   |                   |4.516 KB             
                                                                      |                  
 |                      |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |7  |Thread termination   |Information|1  |Whole Program 4    |Thread termination at
"thread.cpp":76 - includes stack allocation of 10.004 MB and use of   |"thread.cpp":76   
 |"thread.cpp":76       |
> |   |                     |           |   |                   |4.516 KB             
                                                                      |                  
 |                      |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> |8  |Thread termination   |Information|1  |Whole Program 5    |Thread termination at
"21.string.cons.mt.cpp":237 - includes stack allocation of 10 MB and  |"21.string.cons.mt.c|"21.string.cons.mt.cpp|
> |   |                     |           |   |                   |use of 8.578 KB      
                                                                      |pp":237           
 |":237                 |
> ________________________________________________________________________________________________________________________________________________________________________________________________________
> {noformat}

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