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Date: Mon, 5 May 2008 09:35:58 -0700 (PDT)
From: "Martin Sebor (JIRA)" <jira@apache.org>
To: issues@stdcxx.apache.org
Subject: [jira] Commented: (STDCXX-845) [XLC++ 7,8,9] SEGV in
 22.locale.messages.mt
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    [ https://issues.apache.org/jira/browse/STDCXX-845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12594264#action_12594264 ] 

Martin Sebor commented on STDCXX-845:
-------------------------------------

Any reason not to use [{{__rw_once}}|http://fisheye6.cenqua.com/browse/stdcxx/tags/4.2.1/src/once.h?r=4.2.x#l137] to make the one-time initialization thread-safe? (Also, please check your line length and the placement of opening braces.)

Btw., where does the [{{22.locale.messages.mt.cpp}}|http://svn.apache.org/repos/asf/stdcxx/tags/4.2.1/tests/localization/22.locale.messages.mt.cpp] exercise the cache? AFAICS, it uses a single global classic locale for all threads, no?

> [XLC++ 7,8,9] SEGV in 22.locale.messages.mt
> -------------------------------------------
>
>                 Key: STDCXX-845
>                 URL: https://issues.apache.org/jira/browse/STDCXX-845
>             Project: C++ Standard Library
>          Issue Type: Bug
>          Components: 22. Localization
>    Affects Versions: 4.2.1
>         Environment: AIX 5.3 PowerPC IBM XLC++ 9.0 
> AIX 5.3 PowerPC IBM XLC++ 8.0 
> AIX 5.3 PowerPC IBM XLC++ 7.0 
>            Reporter: Travis Vitek
>            Assignee: Travis Vitek
>             Fix For: 4.2.2
>
>         Attachments: stdcxx-845.patch
>
>   Original Estimate: 4h
>          Time Spent: 9h
>  Remaining Estimate: 0h
>
> On AIX, when compiled with XLC++ the test 22.locale.messages.mt fails with {{SIGSEGV}} or {{SIGABRT}}.
> {{SIGSEGV}} on XLC++ 7.0 for 12a, 12d
> {{SIGABRT}} on XLC++ 7.0 for 15a, 15s, 15S
> {{SIGSEGV}} on XLC++ 8.0 for 12a, 12d, 12D, 15a, 15A
> {{SIGABRT}} on XLC++ 8.0 for 15S
> {{SIGSEGV}} on XLC++ 9.0 for 12a, 15a, 15A
> {{SIGABRT}} on XLC++ 9.0 for 15s
> Here is the output for a 12S build...
> {noformat}
> $ dbx 22.locale.messages.mt 
> # INFO (S1) (10 lines):
> # TEXT: 
> # COMPILER: IBM VisualAge C++, __IBMCPP__ = 900
> # ENVIRONMENT: powerpc/LP64 running aix-5.3
> # FILE: 22.locale.messages.mt.cpp
> # COMPILED: Apr  9 2008, 16:38:10
> # COMMENT: thread safety
> ############################################################
> # CLAUSE: lib.locale.messages
> # NOTE (S2) (5 lines):
> # TEXT: executing "gencat rwstdmessages.cat rwstdmessages.msg"
> # CLAUSE: lib.locale.messages
> # FILE: process.cpp
> # LINE: 279
> # INFO (S1) (3 lines):
> # TEXT: testing std::messages<charT> with 8 threads, 100000 iterations each
> # CLAUSE: lib.locale.messages
> # INFO (S1) (3 lines):
> # TEXT: exercising std::messages<char>
> # CLAUSE: lib.locale.messages
> Segmentation fault (core dumped)
> $ dbx 22.locale.messages.mt 
> Type 'help' for help.
> [using memory image in core]
> reading symbolic information ...
> Segmentation fault in strchr.strchr at 0x900000000048ec0 ($t2)
> 0x900000000048ec0 (strchr+0x140) 8d230001       lbzu   r9,0x1(r3)
> (dbx) where
> strchr.strchr() at 0x900000000048ec0
> _C_get_std_facet(__rw::__rw_facet::_C_facet_type,__rw::__rw_facet*(*)(unsigned long,const char*)) const() at 0x100027970
> __rw_get_facet_by_id__4__rwFRCQ2_3std6localeRCQ2_4__rw13__rw_facet_idPCQ2_3std7codecvtXTcTcTPc_@AF18_13() at 0x100070e54
> do_get__Q2_3std8messagesXTc_CFiN21RCQ2_3std12basic_stringXTcTQ2_3std11char_traitsXTc_TQ2_3std9allocatorXTc__() at 0x1000373ec
> get__Q2_3std8messagesXTc_CFiN21RCQ2_3std12basic_stringXTcTQ2_3std11char_traitsXTc_TQ2_3std9allocatorXTc__() at 0x100037178
> 22.locale.messages.mt.void test_get<char>( \
>   const std::messages<char>&,int,int,int,const std::basic_string<char,std::char_traits<char>,std::allocator<char> >&) \
>   (msgs = &(...), cat = 0, set = 4, msgid = 4, dflt = &(...)), line 153 in "22.locale.messages.mt.cpp"
> unnamed block in thread_func(void*)( = 0x0ffffffffffff2e0), line 189 in "22.locale.messages.mt.cpp"
> thread_func(void*)( = 0x0ffffffffffff2e0), line 189 in "22.locale.messages.mt.cpp"
> (dbx) quit
> {noformat}
> This is a new test for 4.2.1, so it is a regression.

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