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From "Martin Sebor (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-449) [ITC/Linux] std::string Write -> Read data-race errors
Date Tue, 19 Jun 2007 01:10:25 GMT
[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: 4.1.3, 4.2
         Environment: Intel Thread Checker 3.1 on Red Hat Enterprise Linux AS release 4 (Nahant
Update 4)
            Reporter: Martin Sebor
            Priority: Critical


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:

$ 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
                |
________________________________________________________________________________________________________________________________________________________________________________________________________



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