libstdc++/6012: Crash in iostreams

libstdc++/6012: Crash in iostreams

[amirgeva]

>Number:         6012
>Category:       libstdc++
>Synopsis:       Crash in iostreams
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Mar 20 04:26:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Amir Geva
>Release:        3.0.4
>Organization:
>Environment:
powerpc-ibm-aix4.3.3.0
>Description:
I am encountering strange crashes in the libstdc++ code.
The included program crashes in the first << operator giving a "Illegal instruction (core dumped)"
The callstack shows that it crashed in: bits/locale_facets.h
At line 778, which is one of the num_put::put() functions.
It seems to be having an invalid virtual base pointer or something to do with the virtual table.

This is a simple example created after a larger program encountered this problem, even with other stream types.
>How-To-Repeat:
#include <iostream>
#include <sstream>

int main(int argc, char* argv[])
{
  std::basic_ostringstream<char> os;
  os << 5.3;
  std::cout << os.str() << std::endl;
  return 0;
}
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

Re: libstdc++/6012: Crash in iostreams

[bkoz]

Synopsis: Crash in iostreams

Responsible-Changed-From-To: unassigned->bkoz
Responsible-Changed-By: bkoz
Responsible-Changed-When: Mon Apr  1 11:15:18 2002
Responsible-Changed-Why:
    Mine.
State-Changed-From-To: open->feedback
State-Changed-By: bkoz
State-Changed-When: Mon Apr  1 11:15:18 2002
State-Changed-Why:
    I cannot reproduce this on linux with gcc-3.1. I get:
    
    %a.out 
    5.3
    
    Which is probably what you're expecting as well. Can you try this with gcc-3_1-branch on AIX?
    
    thanks,
    benjamin

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=6012