data race in std::locale::classic()
-----------------------------------
Key: STDCXX-523
URL: https://issues.apache.org/jira/browse/STDCXX-523
Project: C++ Standard Library
Issue Type: Bug
Components: 22. Localization
Affects Versions: 4.1.3
Reporter: Martin Sebor
Assignee: Martin Sebor
Priority: Minor
Fix For: 4.2
Intel Thread Checker reports the following data race in std::locale::classic():
$ tcheck_cl ./22.locale.statics.mt --no-global --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-trunk-gcc-3.4.6_3-15D/tests/22.locale.statics.mt
--no-global --nthreads=2
# INFO (S1) (10 lines):
# TEXT:
# COMPILER: gcc 3.4.6, __VERSION__ = "3.4.6 20060404 (Red Hat 3.4.6-3)"
# ENVIRONMENT: x86_64/LP64 running linux-elf (Red Hat Enterprise Linux AS
release 4 (Nahant Update 4)) with glibc 2.3
# FILE: 22.locale.statics.mt.cpp
# COMPILED: Aug 16 2007, 19:32:08
# COMMENT: thread safety
############################################################
# CLAUSE: lib.locale.statics
# INFO (S1) (3 lines):
# TEXT: testing std::locale::classic() with 2 threads
# CLAUSE: lib.locale.statics
# NOTE (S2) (4 lines):
# TEXT: std::locale::global(const std::locale&) test disabled
# CLAUSE: lib.locale.statics
# LINE: 129
# +-----------------------+----------+----------+----------+
# | DIAGNOSTIC | ACTIVE | TOTAL | INACTIVE |
# +-----------------------+----------+----------+----------+
# | (S1) INFO | 2 | 2 | 0% |
# | (S2) NOTE | 1 | 2 | 50% |
# +-----------------------+----------+----------+----------+
Application finished
_______________________________________________________________________________
|ID|Short De|Seve|C|Context|Description |1st Acc|2nd Acce|
| |scriptio|rity|o|[Best] | |ess[Bes|ss[Best]|
| |n |Name|u| | |t] | |
| | | |n| | | | |
| | | |t| | | | |
_______________________________________________________________________________
|1 |Write ->|Erro|3|"22.loc|Memory read at |"_mutex|"22.loca|
| |Read dat|r |6|ale.sta|"22.locale.statics.mt.cpp":78 |.h":580|le.stati|
| |a-race | | |tics.mt|conflicts with a prior memory | |cs.mt.cp|
| | | | |.cpp":6|write at "_mutex.h":580 (flow | |p":78 |
| | | | |9 |dependence) | | |
_______________________________________________________________________________
|2 |Read -> |Erro|1|[libstd|Memory write at [libstd15D.so, |"locale|[libstd1|
| |Write da|r | |15D.so,|0xb646b] conflicts with a prior |_classi|5D.so, |
| |ta-race | | |0xb6460|memory read at |c.cpp":|0xb646b]|
| | | | |] |"locale_classic.cpp":45 (anti |45 | |
| | | | | |dependence) | | |
_______________________________________________________________________________
|3 |Read -> |Erro|1|[libstd|Memory write at [libstd15D.so, |"locale|[libstd1|
| |Write da|r | |15D.so,|0xb646b] conflicts with a prior |_classi|5D.so, |
| |ta-race | | |0xb6460|memory read at |c.cpp":|0xb646b]|
| | | | |] |"locale_classic.cpp":55 (anti |55 | |
| | | | | |dependence) | | |
_______________________________________________________________________________
|4 |Thread t|Info|1|Whole |Thread termination at |"thread|"thread.|
| |erminati|rmat| |Program|"thread.cpp":84 - includes stack |.cpp":8|cpp":84 |
| |on |ion | |1 |allocation of 10.004 MB and use |4 | |
| | | | | |of 10.203 KB | | |
_______________________________________________________________________________
|5 |Thread t|Info|1|Whole |Thread termination at |"thread|"thread.|
| |erminati|rmat| |Program|"thread.cpp":84 - includes stack |.cpp":8|cpp":84 |
| |on |ion | |2 |allocation of 10.004 MB and use |4 | |
| | | | | |of 10.188 KB | | |
_______________________________________________________________________________
|6 |Thread t|Info|1|Whole |Thread termination at |"22.loc|"22.loca|
| |erminati|rmat| |Program|"22.locale.statics.mt.cpp":171 - |ale.sta|le.stati|
| |on |ion | |3 |includes stack allocation of 10 |tics.mt|cs.mt.cp|
| | | | | |MB and use of 8.094 KB |.cpp":1|p":171 |
| | | | | | |71 | |
_______________________________________________________________________________
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