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  • From: Michael Higgins <linux AT evolone.org>
  • To: "FreeTDS Development Group" <freetds AT lists.ibiblio.org>
  • Subject: [freetds] Segfault or Preload... why?
  • Date: Tue, 23 Jun 2009 09:08:43 -0700

So for over a year I've had to keep my system stable by refusing updated
libraries. Finally, I updated to all current relevant libs and bins and
suffered for it.

The goal is perl -> MSSQL via ODBC.

FreeTDS, of course, with unixODBC and perl DBD::ODBC.

Perl Test::More does PERL_DL_NONLAZY=1 before any tests. This actually hides
the failures by loading everything up before it's called (I guess), so unless
you are actually *using* the ODBC connection, the problem never shows.

However, with DBIx-Class, the DBI connect is hidden deep in code and there's
no way to use that environment variable to get it working. After more than a
week of hair-pulling, I discovered /etc/ld.so.preload and put
/usr/lib/libtdsodbc.so in it.

Now it works. From what little I understand, unixODBC should be loading this
file:
ldd /usr/lib/libodbc.so
linux-gate.so.1 => (0xb80b8000)
/usr/lib/libtdsodbc.so (0xb7ff6000)
libltdl.so.3 => /usr/lib/libltdl.so.3 (0xb7fd7000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7fbf000)
libc.so.6 => /lib/libc.so.6 (0xb7e76000)
libodbcinst.so.1 => /usr/lib/libodbcinst.so.1 (0xb7e66000)
librt.so.1 => /lib/librt.so.1 (0xb7e5d000)
libdl.so.2 => /lib/libdl.so.2 (0xb7e59000)
/lib/ld-linux.so.2 (0xb80b9000)

But, unless I 'preload' it, I get a segfault in /usr/lib/libtdsodbc.so.

Can anyone on *this* list explain why that might be?

I hear that this can actually work "out of the box", so probably there is
something Gentoo should be doing differently in the compile scripts, but I'm
out of my league when it comes to, like, compiler flags and linking.

Cheers,

--
|\ /| | | ~ ~
| \/ | |---| `|` ?
| |ichael | |iggins \^ /
michael.higgins[at]evolone[dot]org



  • [freetds] Segfault or Preload... why?, Michael Higgins, 06/23/2009

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