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From "Travis Vitek (JIRA)" <j...@apache.org>
Subject [jira] Commented: (STDCXX-845) [XLC++ 7,8,9] SEGV in 22.locale.messages.mt
Date Sat, 03 May 2008 01:06:55 GMT

    [ https://issues.apache.org/jira/browse/STDCXX-845?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12593951#action_12593951
] 

Travis Vitek commented on STDCXX-845:
-------------------------------------

 


So now I have a question that relates to this change and branching. I
mention an inefficiency in std::messages<charT>::do_get() [see
STDCXX-845 comments], and I have a fix that is not appropriate for
4.2.2, but is appropriate for 4.3 [adding a new function]. The fix also
involves removing two functions from the library, which would only be
appropriate for 5.0.

So how should I handle this? Should I submit the above fix to 4.2.2,
merge that to 4.3, apply a new patch to 4.3, then merge that to 5.0 and
then remove the old functions? Or should I submit to 4.2.2, merge to
4.3, apply a patch to 4.3 that will automatically remove the deprecated
functions and then let that get merged to 5.0 on its own?

I guess another option would be to file bugs for each of the issues and
handle them in the release that they are assigned to, but it would be
nice to not have to take a refresher course every six months.

Travis


> [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: 6h
>  Remaining Estimate: 2h
>
> 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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