Bug#35389: glibc2.1 segfaults for C++ stream code from glibc2.0 system

[Dirk Eddelbuettel <edd@debian.org>]

  John> I'm not sure what version of libstdc++ is installed on the system
  John> that has glibc2.1 (Dirk should be able to clarify this point).

Just to recap, here is my _glibc 2.0_ system (mostly slink) where I compiled:

ii  libc6           2.0.7.19981211 GNU C Library: shared libraries
ii  libc6-dev       2.0.7.19981211 GNU C Library: Development libraries and hea
ii  libstdc++2.9    2.91.60-5      The GNU stdc++ library (egcs version)
ii  libstdc++2.9    2.91.60-5      The GNU stdc++ library (egcs version)
No packages found matching libstdc++2.9-glibc2.1.
No packages found matching libstdc++2.9-glibc2.1-dev.

and here is Colin's _glibc 2.1_ machine (potato, but IIRC not current) where
the seg fault occurs:

ii  libc6           2.1.1-0pre1.2  GNU C Library: shared libraries
ii  libc6-dev       2.1.1-0pre1.2  GNU C Library: Development libraries and hea
ii  libstdc++2.9    2.91.61-1      The GNU stdc++ library (egcs version)
ii  libstdc++2.9    2.91.61-1      The GNU stdc++ library (egcs version)
ii  libstdc++2.9-gl 2.91.63-1.1    The GNU stdc++ library (egcs version)
ii  libstdc++2.9-gl 2.91.63-1.1    The GNU stdc++ library (development files)

  Zack>  If both libc and libstdc++ have been updated, then yes, there is a
  Zack> bug.

So is it, or isn't it?

  Zack> I wonder if this is the problem with lseek that got patched upstream
  Zack> about three days ago.

Hm, why would that matter for this problem?  Recall that we trigger the bug
by

  #include <iostream.h>
  #include <strstream.h>

  int
  main (void)
  {
    ostrstream buf;
    for (int i = 32; i < 127; i++)
      buf << (char) i;
    buf << endl;
    buf << ends;
    cout << buf.str ();
    return 0;
  }


Thanks, Dirk


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