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https://issues.apache.org/jira/browse/STDCXX-449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Sebor updated STDCXX-449:
--------------------------------
Priority: Minor (was: Critical)
Affects Version/s: 4.1.2
4.1.4
Fix Version/s: 4.2.1
I think these are benign, at least on x86 and x86_64, since the code has been
there for eons and the string thread safety tests have been passing, but I'll
leave it open so that when we have a bit more time in the 4.2.1 release cycle
we can do a better analysis. At the very least we can silence the ITC errors as
false positives. Bumped down Priority to Minor and scheduled for 4.2.1.
> [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
> Environment: Intel Thread Checker 3.1 on Red Hat Enterprise Linux AS
> release 4 (Nahant Update 4)
> Reporter: Martin Sebor
> Priority: Minor
> Fix For: 4.2.1
>
> Attachments: 21.string.cons.mt.itc-report.html
>
>
> 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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