[Bug c++/11838] New: boost::lexical_cast segfault

[Bug c++/11838] New: boost::lexical_cast segfault

[stl at caltech dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838

           Summary: boost::lexical_cast segfault
           Product: gcc
           Version: 3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: stl at caltech dot edu
                CC: gcc-bugs at gcc dot gnu dot org

crash.cc:
----
#include <boost/lexical_cast.hpp>
#include <boost/date_time/posix_time/posix_time.hpp>

int main() {
    boost::lexical_cast<int>(
        boost::gregorian::date(1969, boost::gregorian::Jul, 21).month()
    );
}
----

[08/06/2003 Wed 12:39.25 PM stl@nuwen ~/temp]
> g++ --version
g++ (GCC) 3.3
Copyright (C) 2003 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


[08/06/2003 Wed 12:39.27 PM stl@nuwen ~/temp]
> g++ -Wall -W crash.cc -o crash

[08/06/2003 Wed 12:39.42 PM stl@nuwen ~/temp]
> crash
Segmentation fault

[08/06/2003 Wed 12:39.54 PM stl@nuwen ~/temp]
>

3.3 and 3.4-20030806 behave identically. I haven't tried any other versions.
MinGW gcc 3.3 on WinXP also produces a segfaulting executable.
The problem does not appear to be on Boost's end; I have been told that 
MSVC.NET 2003 compiles this correctly.

I would submit preprocessed source, but it's about a megabyte. I've tried to 
reduce the test case as much as possible, but it seems that anything more 
eliminates the segfault.

The workaround is to lexical_cast<whatever, int> instead of 
lexical_cast<whatever>. I originally encountered this problem when using 
lexical_cast<string> but I have changed it to lexical_cast<int> as above to 
demonstrate that this is not related to some quirk of string.

Stepping through the program's execution with gdb:
----
(gdb)
0x080497ef in 
boost::date_time::gregorian_calendar_base<boost::date_time::year_month_day_base
<boost::gregorian::greg_year, boost::gregorian::greg_month, 
boost::gregorian::greg_day>, unsigned long>::from_day_number(unsigned long) 
(dayNumber=2440424) at gregorian_calendar.ipp:125
125         return ymd_type(year,month,day);
(gdb)
boost::date_time::date<boost::gregorian::date, 
boost::gregorian::gregorian_calendar, boost::date_time::date_duration<long> 
>::month() const (this=0xbfffdbbc) at date.hpp:81
81            return ymd.month;
(gdb)

Program received signal SIGSEGV, Segmentation fault.
0x08049d56 in std::ios_base::getloc() const (this=0xbfffdb04) at ios_base.h:614
614         getloc() const { return _M_ios_locale; }
(gdb)
----

Sometimes the segfault occurs elsewhere:
----
Program received signal SIGSEGV, Segmentation fault.
0x080498fa in operator<< <char, std::char_traits<char> > (os=@0xbfffe928, 
m=@0xbfffea20) at greg_facet.hpp:58
58          std::locale locale = os.getloc();
----

[Bug c++/11838] boost::lexical_cast segfault

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838


pinskia at physics dot uc dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING


------- Additional Comments From pinskia at physics dot uc dot edu  2003-08-06 20:44 -------
Wee need the preprocessed file as not every one has boost install?
Can you provide both the 3.3 one and the 3.4 one. Use gzip or bzip2 if you want the size 
to go down.

[Bug libstdc++/11838] boost::lexical_cast segfault

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838


pinskia at physics dot uc dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|c++                         |libstdc++


------- Additional Comments From pinskia at physics dot uc dot edu  2003-08-07 00:34 -------
>From looking at the code:
  template <class charT, class traits>
  inline
  std::basic_ostream<charT, traits>&
  operator<<(std::basic_ostream<charT, traits>& os, const greg_month& m)
  {
    typedef boost::date_time::ostream_month_formatter<greg_base_facet, charT> 
greg_month_formatter;
    std::locale locale = os.getloc();
    if (std::has_facet<greg_base_facet>(locale)) {
      const greg_base_facet& f = std::use_facet<greg_base_facet>(locale);
      greg_month_formatter::format_month(m, os, f);

    }
    else {
      os << std::setw(2) << std::setfill('0') << m;   //this line
    }

    return os;
  }

The problem there is stack overflow that is causing the seg fault but that is because the 
line marked this line is calling the same function over and over.  I do not know if this is a 
boost problem or libstdc++ problem (becuase I do not like locals at all and I do not know 
them).

[Bug libstdc++/11838] boost::lexical_cast segfault

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838


pinskia at physics dot uc dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From pinskia at physics dot uc dot edu  2003-08-07 01:59 -------
Marking this as invalid to mark it as ...

[Bug libstdc++/11838] boost::lexical_cast segfault

[pinskia at physics dot uc dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838


pinskia at physics dot uc dot edu changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |UNCONFIRMED
         Resolution|INVALID                     |


------- Additional Comments From pinskia at physics dot uc dot edu  2003-08-07 01:59 -------
Unconfirmed.

[Bug libstdc++/11838] boost::lexical_cast segfault

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838



------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-28 16:03 -------
Can a libstdc++ export look at this one because I think boost's code is not doing what they think 
it should do?

[Bug libstdc++/11838] boost::lexical_cast segfault

[stl at caltech dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838



------- Additional Comments From stl at caltech dot edu  2003-08-28 20:16 -------
Is this related?

http://lists.boost.org/MailArchives/boost/msg51572.php

It looks like this may be Boost's fault, not gcc's. But I don't know enough 
about Boost internals or locales to really know.

[Bug libstdc++/11838] boost::lexical_cast segfault

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
              Alias|                            |boost796799


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-08-28 20:23 -------
It is the same bug, as I looked at why the seg fault happening before but I still do not know if it is 
boost's bug or ours, GCC.

[Bug libstdc++/11838] boost::lexical_cast segfault

[stl at caltech dot edu]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838



------- Additional Comments From stl at caltech dot edu  2003-09-13 21:39 -------
It turns out that this is boost's bug. See:
http://lists.boost.org/MailArchives/boost/msg52323.php

This bug can be closed (as INVALID?). Thanks.

[Bug libstdc++/11838] boost::lexical_cast segfault

[pinskia at gcc dot gnu dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11838


pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From pinskia at gcc dot gnu dot org  2003-09-14 00:38 -------
Not GCC bug but rather a boost bug.